STERLING CHEMICALS INC
10-K/A, 1996-04-05
INDUSTRIAL ORGANIC CHEMICALS
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<PAGE>
 
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                  FORM 10-K/A

                             --------------------

[X]  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934 [FEE REQUIRED]
                  For the fiscal year ended September 30, 1995
                                       OR
[ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
    EXCHANGE ACT OF 1934 [NO FEE REQUIRED]
                For the transition period from              to

                         Commission File Number 1-10059
                            STERLING CHEMICALS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
                             --------------------
 
 
                   DELAWARE                       76-0185186
      (STATE OR OTHER JURISDICTION OF           (I.R.S. EMPLOYER
      INCORPORATION OR ORGANIZATION)           IDENTIFICATION NO.)
                    
 
        1200 SMITH STREET SUITE 1900              77002-4312
                HOUSTON, TEXAS                    (ZIP CODE)

                   (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)
      REGISTRANTS'S TELEPHONE NUMBER, INCLUDING AREA CODE: (713) 650-3700

                             --------------------

          SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:


                                                  NAME OF EACH EXCHANGE
          TITLE OF EACH CLASS                      ON WHICH REGISTERED
          -------------------                      -------------------
COMMON STOCK, PAR VALUE $.01 PER SHARE        NEW YORK STOCK EXCHANGE, INC.

          SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT:
                                      NONE

  Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes  X  No

  Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of the Form 10-K or any amendment to this
Form 10-K.

  As of April 1, 1996, the number of shares of common stock outstanding was
55,689,991. As of such date, the aggregate market value of common stock held by
nonaffiliates, based upon the closing price of these shares on the New York
Stock Exchange, was approximately $552 million.

                      DOCUMENTS INCORPORATED BY REFERENCE:

(1) Portions of the Company's Annual Report to Shareholders for the fiscal year
  ended September 30, 1995 (Part II Items 5-8 & Part IV Item 14(a)(1)
(2) Portions of the Company's Definitive Proxy Statement dated December 21, 1995
(Part III Items 10-12).
 
<PAGE>
 
                                    PART IV


ITEM 14. EXHIBITS, CONSOLIDATED FINANCIAL STATEMENT SCHEDULES AND REPORTS ON
         FORM 8-K.

  (a) Financial Statements, Financial Statement Schedules and Exhibits

      1. Consolidated Financial Statements

<TABLE>
<CAPTION>
 
                                                           PAGE
                                                           ----
<S>                                                        <C>
Report of Management.....................................   *
Report of Independent Accountants........................   *
Sterling Chemicals, Inc. Consolidated Balance Sheet as      *
 of September 30, 1995 and 1994..........................   *
Sterling Chemicals, Inc. Consolidated Statements of
 Operations for the fiscal years ended September 30, 
 1995, 1994 and 1993.....................................   *
Sterling Chemicals, Inc. Consolidated Statement of 
 Changes in Stockholders' Equity for the fiscal years 
 ended September 30, 1995, 1994 and 1993.................   *
Sterling Chemicals, Inc. Consolidated Statement of Cash
 Flows for the fiscal years ended September 30, 1995,
 1994 and 1993...........................................   *
Notes to Consolidated Financial Statements...............   *

</TABLE>

  * Incorporated herein by reference to the appropriate portions of the
Company's Annual Report to Shareholders for the fiscal year ended September 30,
1995.

      2. All schedules for which provision is made in Regulation S-X of the
         Securities and Exchange Commission are not required under the related
         instruction or are inapplicable and, therefore, have been omitted

      3. Exhibits

  Exhibit No.'s 10.51, 10.52 and 10.55 are being refiled to disclose the term of
each contract which was previously omitted when these Exhibits were filed with
the Company's annual report on Form 10-K for the year ended September 30, 1995.
Confidential treatment has been requested with respect to portions of these
Exhibits, and such request has been granted.

  Except as otherwise noted under "Description of Exhibit," each exhibit not
filed herewith is incorporated by reference to the exhibit of the same number
filed with the Company's Registration Statement on Form S-1 dated October 12,
1988 (Registration No. 33-24020).

<TABLE> 
<CAPTION> 
 
EXHIBIT
NUMBER                    DESCRIPTION OF EXHIBIT
- -------                   ----------------------
<C>      <S>
    2.1  --Purchase Agreement dated as of August 20, 1992 between Tenneco 
           Canada Inc. as Seller, and Sterling Pulp Chemicals, Ltd. and Sterling
           Canada, Inc. as Buyers (the "Purchase Agreement"), incorporated by
           reference from Exhibit 2.1 to the Company's Current Report on Form 
           8-K dated as of September 3, 1992.
    3.1  --Restated Certificate of Incorporation of the Company.
    3.2  --Amended By-laws of the Company,incorporated by reference from exhibit
           3.2 to the Company's Annual Report on Form 10-K for the fiscal year
           ended September 30, 1994.
    4.2  --Form of Registration Rights Agreements dated as of July 30, 1986
           among the Company and the holders of Common Stock listed on the
           signature page thereto.
</TABLE>

                                       1
<PAGE>
 
<TABLE> 
<CAPTION> 
 
EXHIBIT
NUMBER                    DESCRIPTION OF EXHIBIT
- -------                   ----------------------
<C>      <S>
 +10.1    --Assets Purchase Agreement dated August 1, 1986, between Monsanto
            Company and the Company, incorporated by reference from exhibit
            10.1 to the Company's Annual Report on Form 10-K for the fiscal
            year ended September 30, 1992.
**10.2    --Credit Agreement dated April 13, 1995, among the Company, Texas
            Commerce Bank National Association as Agent and as a Lender and
            Other Lenders.
**10.2(a) --Guaranty dated as of September 28, 1995, among the Company, Texas
            Commerce Bank National Association as Agent and as a Lender and
            Other Lenders.
**10.2(b) --First Amendment to Credit Agreement dated September 28, 1995,
            among the Company, Texas Commerce Bank National Association as
            Agent and as a Lender and Other Lenders.
**10.3    --Credit Agreement dated September 28, 1995, among Sterling Pulp
            Chemicals, Ltd., Texas Commerce Bank National Association as agent
            and as a lender and Other Lenders.
**10.4    --Credit Agreement dated as of April 28, 1995, between Sterling Pulp
            Chemicals, Ltd. and the Bank of Nova Scotia.
  10.6    --Sterling Chemicals, Inc. Salaried Employees' Pension Plan (Restated
            as of October 1, 1993), incorporated by reference from exhibit 10.6
            to the Company's Annual Report on Form 10-K for the fiscal year
            ended September 30, 1993.
  10.6(a) --Supplement to the Sterling Chemicals, Inc. Salaried Employee's
            Pension Plan (Restated as of January 1, 1994), incorporated by
            reference from exhibit 10.6(a) to the Company's Annual Report on
            Form 10-K for the fiscal year ended September 30, 1994.
  10.6(b) --First and Second Amendments to the Sterling Chemicals, Inc.
            Salaried Employees' Pension Plan dated April 27, 1994 and September
            23, 1994, respectively, incorporated by reference from exhibit
            10.6(b) to the Company's Annual Report on Form 10-K for the fiscal
            year ended September 30, 1994.
  10.8    --Sterling Chemicals, Inc. Hourly Paid Employees' Pension Plan
            (Restated as of October 1, 1993), incorporated by reference from
            exhibit 10.8 to the Company's Annual Report on Form 10-K for the
            fiscal year ended September 30, 1993.
  10.8(a) --Supplement to the Sterling Chemicals, Inc. Hourly Paid Employee's
            Pension Plan (Restated as of January 1, 1994), incorporated by
            reference from exhibit 10.8(a) to the Company's Annual Report on
            Form 10-K for the fiscal year ended September 30, 1994.
  10.8(b) --First Amendment to the Sterling Chemicals, Inc. Hourly Paid
            Employees' Pension Plan dated April 27, 1994, incorporated by
            reference from exhibit 10.8(b) to the Company's Annual Report on
            Form 10-K for the fiscal year ended September 30, 1994.
  10.9    --Sterling Chemicals, Inc. Amended and Restated Savings and
            Investment Plan, incorporated by reference from exhibit 10.10 to
            the Company's Annual Report on Form 10-K for the fiscal year
            ended September 30, 1993.
  10.9(a) --Supplements to the Sterling Chemicals, Inc. Savings and Investment
            Plan for Hourly Paid Employees and Salaried Employees, incorporated
            by reference from exhibit 10.10(a) to the Company's Annual Report on
            Form 10-K for the fiscal year ended September 30, 1994.
  10.9(b) --First and Second Amendments to the Sterling Chemicals, Inc. Amended
            and Restated Savings and Investment Plan dated April 27, 1994 and
            October 26, 1994, respectively, incorporated by reference from
            exhibit 10.10(b) to the Company's Annual Report on Form 10-K for the
            fiscal year ended September 30, 1994.
  10.10   --Sterling Chemicals, Inc. Pension Benefit Equalization Plan.
  10.11   --Sterling Chemicals, Inc. 1989 Omnibus Stock and Incentive Plan.
  10.12   --Sterling Chemicals, Inc. Amended and Restated Employee Stock
            Ownership Plan, incorporated by reference from exhibit 10.12 to the
            Company's Annual Report on Form 10-K for the fiscal year ended
            September 30, 1993.
  10.12(a)--First Amendment to the Sterling Chemicals, Inc. Amended and
            Restated Employees' Stock Ownership Plan dated April 27, 1994,
            incorporated by reference from exhibit 10.12(a) to the Company's
            Annual Report on Form 10-K for the fiscal year ended September 30,
            1994.
</TABLE>

                                       2
<PAGE>
 
<TABLE> 
<CAPTION> 
 
EXHIBIT
NUMBER                    DESCRIPTION OF EXHIBIT
- -------                   ----------------------
<C>       <S>

+**10.13    --Styrene Monomer Conversion Contract dated November 3, 1995, between            
              Monsanto Company and the Company.                                              
  +10.17    --Styrene Monomer Sales Contract dated as of August 1, 1991, between             
              the Company and Monsanto Company, incorporated by reference from               
              exhibit 10.12(A) to the Company's Annual Report on Form 10-K for               
              the fiscal year ended September 30, 1990.                                      
  +10.18    --Styrene Monomer Exchange Contract dated as of August 1, 1991,                  
              between the Company and Monsanto Company, incorporated by reference            
              from exhibit 10.13(A) to the Company's Annual Report on Form 10-K              
              for the fiscal year ended September 30, 1990.                                  
  +10.19    --Acrylonitrile Exchange Contract dated January 1, 1994, between the             
              Company and Monsanto Company, incorporated by reference from                   
              exhibit 10.19 to the Company's Annual Report on Form 10-K for the              
              fiscal year ended September 30, 1994.                                          
  +10.21    --Production Agreement dated April 15,1988 between BP Chemicals                  
              Americas Inc. and the Company and First and Second Amendment                   
              thereto.                                                                       
  +10.22    --Agreement dated May 2, 1988, between E.I. du Pont de Nemours and               
              Company and the Company.                                                       
   10.23    --License Agreement dated April 15, 1988, between BP Chemicals                   
              Americas Inc. and the Company.                                                 
  +10.24    --Product Sales Agreement dated August 1, 1986, between BASF                     
              Corporation and the Company, incorporated by reference from exhibit            
              10.22 to the Company's Annual Report on Form 10-K for the fiscal               
              year ended September 30, 1992.                                                 
  +10.24(a) --Amendment No. 3 to Product Sales Agreement as of January 1,1994,               
              between BASF Corporation and the Company, incorporated by reference            
              from exhibit 10.22(a) to the Company's Annual Report on Form 10-K              
              for the fiscal year ended September 30, 1994.                                  
   10.25    --License Agreement dated August 1, 1986, between Monsanto Company               
              and the Company.                                                               
  +10.26    --Amended Lease and Production Agreement dated August 8, 1994,                   
              between BP Chemicals Americas Inc. and the Company, incorporated by            
              reference from exhibit 10.21 to the Company's Annual Report on Form            
              10-K for the fiscal year ended September 30, 1994.                             
   10.30    --Form of Indemnity Agreement executed between the Company and each              
              of its officers and directors, incorporated by reference from                  
              exhibit 10.30 to the Company's Annual Report on Form 10-K for the              
              fiscal year ended September 30, 1994.                                          
   10.31    --Agreement dated January 30, 1987, among J. Virgil Waggoner, Gordon             
              A. Cain and the Company, regarding capital stock of the Company.               
   10.32    --Amended and Restated Sterling Chemicals, Inc. Hourly Employees'                
              Profit Sharing Plan, incorporated by reference from exhibit 10.32              
              to the Company's Annual Report on Form 10-K for the fiscal year                
              ended September 30, 1993.                                                      
   10.33    --Amended and Restated Sterling Chemicals, Inc. Salaried Employee's              
              Profit Sharing Plan, incorporated by reference from exhibit                    
              10.31 to the Company's Annual Report on Form 10-K for the fiscal               
              year ended September 30, 1993.                                                 
   10.34    --Sterling Chemicals, Inc. Amended and Restated Supplemental Employee            
              Retirement Plan, incorporated by reference from exhibit 10.34 to               
              the Company's Annual Report on Form 10-K for the fiscal year ended             
              September 30, 1989 (Commission File Number 1-10059).                           
   10.35    --Sterling Chemicals, Inc. Deferred Compensation Plan, incorporated              
              by reference from exhibit 10.35 to the Company's Annual Report on              
              Form 10-K for the fiscal year ended September 30, 1989 (Commission             
              File Number 1-10059).                                                          
   10.36    --Article of Agreement between the Company, its successors and                   
              assigns, and Texas City, Texas Metal Trades Council, AFL-CIO Texas             
              City, Texas, May 1, 1993 to May 1, 1996, incorporated by reference             
              from exhibit 10.35 to the Company's Annual Report on Form 10- K for            
              the fiscal year ended September 30, 1993.                                       
</TABLE>

                                       3
<PAGE>
 
<TABLE> 
<CAPTION> 
 
EXHIBIT
NUMBER                    DESCRIPTION OF EXHIBIT
- -------                   ----------------------
<C>      <S>

  10.38  --Conditional Performance Guaranty dated as of August 20, 1992, by
           Albright & Wilson, Ltd. in favor of Sterling Pulp Chemicals, Ltd.,
           Sterling Canada, Inc. and the Indemnities identified in Section 10.2
           of the Purchase Agreement, incorporated by reference from exhibit
           10.38 to the Company's Current Report on Form 8-K dated September 3,
           1992.
  10.39  --Performance Guaranty dated as of August 20, 1992, by the Company in
           favor of Tenneco Canada Inc., Rio Linda Chemical Co., Albright &
           Wilson Americas, Inc. and the Indemnities identified in Section 10.3
           of the Purchase Agreement, incorporated by reference from exhibit
           10.39 to the Company's Current Report on Form 8-K dated September 3,
           1992.
  10.45  --Lease dated March 1, 1990 between Procter & Gamble, Inc. and Tenneco
           Canada Inc., as amended by a Lease Modification Agreement dated
           August 9, 1991, and Consent and Assignment Agreement dated as of
           August 21, 1992 among 982174 Ontario Limited, Sterling Pulp
           Chemicals, Ltd., Proctor & Gamble, Inc., Tenneco Canada Inc. and The
           Bank of Nova Scotia, incorporated by reference from exhibit 10.45 to
           the Company's Annual Report on Form 10-K for the fiscal year ended
           September 30, 1992.
  10.46  --Lease dated July 1, 1977 between Canadian National Railway Company
           and ERCO Industries Limited, and Consent and Assignment Agreement
           dated as of August 21, 1992 among Tenneco Canada Inc., Sterling Pulp
           Chemicals, Ltd., Canadian National Railway Company and The Bank of
           Nova Scotia, incorporated by reference from exhibit 10.46 to the
           Company's Annual Report on Form 10-K for the fiscal year ended
           September 30, 1992.
 +10.48  --Sales and Purchase Agreement dated April 1, 1994, between BP
           Chemicals Ltd. and the Company, incorporated by reference from
           exhibit 10.48 to the Company's Annual Report on Form 10-K for the
           fiscal year ended September 30, 1994.
 +10.49  --Contract for Sale and Purchase of Ethylene dated October 28, 1988,
           between Phillips 66 Company and the Company, incorporated by
           reference from exhibit 10.49 to the Company's Annual Report on Form
           10-K for the fiscal year ended September 30, 1994.
  10.50  --Agreement between Sterling Pulp Chemicals Ltd. North Vancouver
           British Columbia and Pulp, Paper and Woodworkers of Canada Local 5
           British Columbia effective December 1, 1994 to November 30, 1997,
           incorporated by reference from exhibit 10.50 to the Company's Annual
           Report on Form 10-K for the fiscal year ended September 30, 1994.
+*10.51  --Contract for Sale and Purchase of Ethylene effective January 1, 1995,
           between Phillips Chemical Company and the Company.
+*10.52  --Chemical Products Sales Agreement--Ethylene, dated December 7,
           1994, between Lyondell Petrochemical Company and the Company.
**10.53  --Agreement between Sterling Pulp Chemicals Ltd. Buckingham, Quebec and
           the Energy and Chemicals Workers Union effective November 30, 1994
           to November 30, 1997.
**10.54  --Agreement between Sterling Pulp Chemicals Ltd., Buckingham, Quebec,
           and the Office and Professional Employees International Union,
           effective June 25, 1995 to November 14, 1997.
+*10.55  --Product Supply Agreement dated May 15, 1995, between Praxair Hydrogen
           Supply, Inc. and the Company.
 **13.1  --Sterling Chemicals, Inc. Annual Report to Shareholders for the fiscal
           year ended September 30, 1995.
 **27.0  --Financial Data Schedule.
</TABLE>

- ----------
*  Filed herewith.
** Previously filed with the Company's annual report on Form 10-K for the year
   ended September 30, 1995.
+  Confidential treatment has been requested with respect to portions of this
   Exhibit, and such request has been granted.

                                       4
<PAGE>
 
  (b) Reports on Form 8-K.


  No reports on Form 8-K were filed during the quarter ended September 30, 1995.
However, on October 31, 1995, the Company filed a Current Report on Form 8-K
describing the engagement of the firm of Arthur Andersen LLP as its independent
auditors for the year ending September 30, 1996, to replace the firm of Coopers
& Lybrand L.L.P.

                                       5
<PAGE>
 
                                   SIGNATURES

  PURSUANT TO THE REQUIREMENTS OF SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE
ACT OF 1934, THE REGISTRANT HAS DULY CAUSED THIS REPORT TO BE SIGNED ON ITS
BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED.


                                         STERLING CHEMICALS, INC.
                                                 (Registrant)



                                         By        /s/ J. Virgil Waggoner
                                             -------------------------------
                                                     (J. Virgil Waggoner)
                                                     President and Chief
                                                     Executive Officer


DATE: APRIL 4, 1996


                                         By          /s/ Jim P. Wise
                                               ------------------------
                                                     (Jim P. Wise)
                                                     Vice President - Finance
                                                     and Chief Financial Officer


DATE: APRIL 4, 1996

                                       6
<PAGE>
 
LIST OF EXHIBITS

<TABLE> 
<CAPTION> 
 
EXHIBIT
NUMBER                    DESCRIPTION OF EXHIBIT
- -------                   ----------------------
<C>      <S>
   2.1    --Purchase Agreement dated as of August 20, 1992 between Tenneco 
            Canada Inc. as Seller, and Sterling Pulp Chemicals, Ltd. and
            Sterling Canada, Inc. as Buyers (the "Purchase Agreement"),
            incorporated by reference from Exhibit 2.1 to the Company's Current
            Report on Form 8-K dated as of September 3, 1992.
   3.1    --Restated Certificate of Incorporation of the Company.
   3.2    --Amended By-laws of the Company,incorporated by reference from
            exhibit 3.2 to the Company's Annual Report on Form 10-K for the
            fiscal year ended September 30, 1994.
   4.2    --Form of Registration Rights Agreements dated as of July 30, 1986
            among the Company and the holders of Common Stock listed on the
            signature page thereto.
 +10.1    --Assets Purchase Agreement dated August 1, 1986, between Monsanto
            Company and the Company, incorporated by reference from exhibit
            10.1 to the Company's Annual Report on Form 10-K for the fiscal
            year ended September 30, 1992.
**10.2    --Credit Agreement dated April 13, 1995, among the Company, Texas
            Commerce Bank National Association as Agent and as a Lender and
            Other Lenders.
**10.2(a) --Guaranty dated as of September 28, 1995, among the Company, Texas
            Commerce Bank National Association as Agent and as a Lender and
            Other Lenders.
**10.2(b) --First Amendment to Credit Agreement dated September 28, 1995,
            among the Company, Texas Commerce Bank National Association as
            Agent and as a Lender and Other Lenders.
**10.3    --Credit Agreement dated September 28, 1995, among Sterling Pulp
            Chemicals, Ltd., Texas Commerce Bank National Association as agent
            and as a lender and Other Lenders.
**10.4    --Credit Agreement dated as of April 28, 1995, between Sterling Pulp
            Chemicals, Ltd. and the Bank of Nova Scotia.
  10.6    --Sterling Chemicals, Inc. Salaried Employees' Pension Plan (Restated
            as of October 1, 1993), incorporated by reference from exhibit 10.6
            to the Company's Annual Report on Form 10-K for the fiscal year
            ended September 30, 1993.
  10.6(a) --Supplement to the Sterling Chemicals, Inc. Salaried Employee's
            Pension Plan (Restated as of January 1, 1994), incorporated by
            reference from exhibit 10.6(a) to the Company's Annual Report on
            Form 10-K for the fiscal year ended September 30, 1994.
  10.6(b) --First and Second Amendments to the Sterling Chemicals, Inc.
            Salaried Employees' Pension Plan dated April 27, 1994 and September
            23, 1994, respectively, incorporated by reference from exhibit
            10.6(b) to the Company's Annual Report on Form 10-K for the fiscal
            year ended September 30, 1994.
  10.8    --Sterling Chemicals, Inc. Hourly Paid Employees' Pension Plan
            (Restated as of October 1, 1993), incorporated by reference from
            exhibit 10.8 to the Company's Annual Report on Form 10-K for the
            fiscal year ended September 30, 1993.
  10.8(a) --Supplement to the Sterling Chemicals, Inc. Hourly Paid Employee's
            Pension Plan (Restated as of January 1, 1994), incorporated by
            reference from exhibit 10.8(a) to the Company's Annual Report on
            Form 10-K for the fiscal year ended September 30, 1994.
  10.8(b) --First Amendment to the Sterling Chemicals, Inc. Hourly Paid
            Employees' Pension Plan dated April 27, 1994, incorporated by
            reference from exhibit 10.8(b) to the Company's Annual Report on
            Form 10-K for the fiscal year ended September 30, 1994.
  10.9    --Sterling Chemicals, Inc. Amended and Restated Savings and
            Investment Plan, incorporated by reference from exhibit 10.10 to
            the Company's Annual Report on Form 10-K for the fiscal year
            ended September 30, 1993.
  10.9(a) --Supplements to the Sterling Chemicals, Inc. Savings and Investment
            Plan for Hourly Paid Employees and Salaried Employees, incorporated
            by reference from exhibit 10.10(a) to the Company's Annual Report on
            Form 10-K for the fiscal year ended September 30, 1994.
  10.9(b) --First and Second Amendments to the Sterling Chemicals, Inc. Amended
            and Restated Savings and Investment Plan dated April 27, 1994 and
            October 26, 1994, respectively, incorporated by reference from
            exhibit 10.10(b) to the Company's Annual Report on Form 10-K for the
            fiscal year ended September 30, 1994.
</TABLE> 

                                       7
<PAGE>
 
<TABLE> 
<CAPTION> 
 
EXHIBIT
NUMBER                    DESCRIPTION OF EXHIBIT
- -------                   ----------------------
<C>      <S>

   10.11    -Sterling Chemicals, Inc. 1989 Omnibus Stock and Incentive Plan.
   10.12    -Sterling Chemicals, Inc. Amended and Restated Employee Stock
             Ownership Plan, incorporated by reference from exhibit 10.12 to the
             Company's Annual Report on Form 10-K for the fiscal year ended
             September 30, 1993.
   10.12(a) -First Amendment to the Sterling Chemicals, Inc. Amended and
             Restated Employees' Stock Ownership Plan dated April 27, 1994,
             incorporated by reference from exhibit 10.12(a) to the Company's
             Annual Report on Form 10-K for the fiscal year ended September 30,
             1994.
+**10.13   --Styrene Monomer Conversion Contract dated November 3, 1995, between
             Monsanto Company and the Company.
  +10.17   --Styrene Monomer Sales Contract dated as of August 1, 1991, between
             the Company and Monsanto Company, incorporated by reference from
             exhibit 10.12(A) to the Company's Annual Report on Form 10-K for
             the fiscal year ended September 30, 1990.
  +10.18   --Styrene Monomer Exchange Contract dated as of August 1, 1991,
             between the Company and Monsanto Company, incorporated by reference
             from exhibit 10.13(A) to the Company's Annual Report on Form 10-K
             for the fiscal year ended September 30, 1990.
  +10.19   --Acrylonitrile Exchange Contract dated January 1, 1994, between the
             Company and Monsanto Company, incorporated by reference from
             exhibit 10.19 to the Company's Annual Report on Form 10-K for the
             fiscal year ended September 30, 1994.
  +10.21   --Production Agreement dated April 15,1988 between BP Chemicals
             Americas Inc. and the Company and First and Second Amendment
             thereto.
  +10.22   --Agreement dated May 2, 1988, between E.I. du Pont de Nemours and
             Company and the Company.
   10.23   --License Agreement dated April 15, 1988, between BP Chemicals
             Americas Inc. and the Company.
  +10.24   --Product Sales Agreement dated August 1, 1986, between BASF
             Corporation and the Company, incorporated by reference from exhibit
             10.22 to the Company's Annual Report on Form 10-K for the fiscal
             year ended September 30, 1992.
  +10.24(a) -Amendment No. 3 to Product Sales Agreement as of January 1,1994,
             between BASF Corporation and the Company, incorporated by reference
             from exhibit 10.22(a) to the Company's Annual Report on Form 10-K
             for the fiscal year ended September 30, 1994.
   10.25   --License Agreement dated August 1, 1986, between Monsanto Company
             and the Company.
  +10.26   --Amended Lease and Production Agreement dated August 8, 1994,
             between BP Chemicals Americas Inc. and the Company, incorporated by
             reference from exhibit 10.21 to the Company's Annual Report on Form
             10-K for the fiscal year ended September 30, 1994.
   10.30   --Form of Indemnity Agreement executed between the Company and each
             of its officers and directors, incorporated by reference from
             exhibit 10.30 to the Company's Annual Report on Form 10-K for the
             fiscal year ended September 30, 1994.
   10.31   --Agreement dated January 30, 1987, among J. Virgil Waggoner, Gordon
             A. Cain and the Company, regarding capital stock of the Company.
   10.32   --Amended and Restated Sterling Chemicals, Inc. Hourly Employees'
             Profit Sharing Plan, incorporated by reference from exhibit 10.32
             to the Company's Annual Report on Form 10-K for the fiscal year
             ended September 30, 1993.
   10.33   --Amended and Restated Sterling Chemicals, Inc. Salaried Employee's
             Profit Sharing Plan, incorporated by reference from exhibit
             10.31 to the Company's Annual Report on Form 10-K for the fiscal
             year ended September 30, 1993.
   10.34   --Sterling Chemicals, Inc. Amended and Restated Supplemental Employee
             Retirement Plan, incorporated by reference from exhibit 10.34 to
             the Company's Annual Report on Form 10-K for the fiscal year ended
             September 30, 1989 (Commission File Number 1-10059).
   10.35   --Sterling Chemicals, Inc. Deferred Compensation Plan, incorporated
             by reference from exhibit 10.35 to the Company's Annual Report on
             Form 10-K for the fiscal year ended September 30, 1989 (Commission
             File Number 1-10059).


</TABLE> 

                                       8
<PAGE>
 
<TABLE> 
<CAPTION> 
 
EXHIBIT
NUMBER                    DESCRIPTION OF EXHIBIT
- -------                   ----------------------
<C>      <S>

  10.36  --Article of Agreement between the Company, its successors and
           assigns, and Texas City, Texas Metal Trades Council, AFL-CIO Texas
           City, Texas, May 1, 1993 to May 1, 1996, incorporated by reference
           from exhibit 10.35 to the Company's Annual Report on Form 10- K for
           the fiscal year ended September 30, 1993.
  10.38  --Conditional Performance Guaranty dated as of August 20, 1992, by
           Albright & Wilson, Ltd. in favor of Sterling Pulp Chemicals, Ltd.,
           Sterling Canada, Inc. and the Indemnities identified in Section 10.2
           of the Purchase Agreement, incorporated by reference from exhibit
           10.38 to the Company's Current Report on Form 8-K dated September 3,
           1992.
  10.39  --Performance Guaranty dated as of August 20, 1992, by the Company in
           favor of Tenneco Canada Inc., Rio Linda Chemical Co., Albright &
           Wilson Americas, Inc. and the Indemnities identified in Section 10.3
           of the Purchase Agreement, incorporated by reference from exhibit
           10.39 to the Company's Current Report on Form 8-K dated September 3,
           1992.
  10.45  --Lease dated March 1, 1990 between Procter & Gamble, Inc. and Tenneco
           Canada Inc., as amended by a Lease Modification Agreement dated
           August 9, 1991, and Consent and Assignment Agreement dated as of
           August 21, 1992 among 982174 Ontario Limited, Sterling Pulp
           Chemicals, Ltd., Proctor & Gamble, Inc., Tenneco Canada Inc. and The
           Bank of Nova Scotia, incorporated by reference from exhibit 10.45 to
           the Company's Annual Report on Form 10-K for the fiscal year ended
           September 30, 1992.
  10.46  --Lease dated July 1, 1977 between Canadian National Railway Company
           and ERCO Industries Limited, and Consent and Assignment Agreement
           dated as of August 21, 1992 among Tenneco Canada Inc., Sterling Pulp
           Chemicals, Ltd., Canadian National Railway Company and The Bank of
           Nova Scotia, incorporated by reference from exhibit 10.46 to the
           Company's Annual Report on Form 10-K for the fiscal year ended
           September 30, 1992.
 +10.48  --Sales and Purchase Agreement dated April 1, 1994, between BP
           Chemicals Ltd. and the Company, incorporated by reference from
           exhibit 10.48 to the Company's Annual Report on Form 10-K for the
           fiscal year ended September 30, 1994.
 +10.49  --Contract for Sale and Purchase of Ethylene dated October 28, 1988,
           between Phillips 66 Company and the Company, incorporated by
           reference from exhibit 10.49 to the Company's Annual Report on Form
           10-K for the fiscal year ended September 30, 1994.
  10.50  --Agreement between Sterling Pulp Chemicals Ltd. North Vancouver
           British Columbia and Pulp, Paper and Woodworkers of Canada Local 5
           British Columbia effective December 1, 1994 to November 30, 1997,
           incorporated by reference from exhibit 10.50 to the Company's Annual
           Report on Form 10-K for the fiscal year ended September 30, 1994.
+*10.51  --Contract for Sale and Purchase of Ethylene effective January 1, 1995,
           between Phillips Chemical Company and the Company.
+*10.52  --Chemical Products Sales Agreement--Ethylene, dated December 7,
           1994, between Lyondell Petrochemical Company and the Company.
**10.53  --Agreement between Sterling Pulp Chemicals Ltd. Buckingham, Quebec and
           the Energy and Chemicals Workers Union effective November 30, 1994
           to November 30, 1997.
**10.54  --Agreement between Sterling Pulp Chemicals Ltd., Buckingham, Quebec,
           and the Office and Professional Employees International Union,
           effective June 25, 1995 to November 14, 1997.
+*10.55  --Product Supply Agreement dated May 15, 1995, between Praxair Hydrogen
           Supply, Inc. and the Company.
**13.1   --Sterling Chemicals, Inc. Annual Report to Shareholders for the fiscal
           year ended September   30, 1995.
**27.0   --Financial Data Schedule.
</TABLE>

- ----------
*  Filed herewith.
** Previously filed with the Company's annual report on Form 10-K for the year
   ended September 30, 1995.
+  Confidential treatment has been requested with respect to portions of this
   Exhibit, and such request has been granted.

 

                                       9

<PAGE>
 
                                                                 Exhibit 10.51**

  ***OMITTED INFORMATION DENOTED BY ASTERISKS (***) HAS BEEN FILED SEPARATELY 
WITH THE COMMISSION AND IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST.***


                  CONTRACT FOR SALE AND PURCHASE OF ETHYLENE

     THIS CONTRACT, entered into this first day of January 1995, by and between
STERLING CHEMICALS, INC., a Delaware corporation having an office in Houston,
Texas, hereinafter called "BUYER", and PHILLIPS CHEMICAL COMPANY, a division of
Phillips Petroleum Company, a Delaware corporation with an operating office in
Bartlesville, Oklahoma, hereinafter called "SELLER";

WITNESSETH:

In consideration of the mutual promises and covenants herein contained, the
parties hereto agree as follows:

                         ARTICLE I: SALE AND PURCHASE

     SELLER hereby sells and agrees to deliver and BUYER hereby purchases and
agrees to receive and pay for during the period, on the terms and conditions,
and at the price hereinafter stated, (***) per contract year of ethylene (plus
or minus (***), at BUYER's option) beginning January 1, 1995, and continuing
thereafter for the term provided for in Article II below. Deliveries shall be
made in approximately equal monthly installments, and in no event shall SELLER
be required to deliver or BUYER be required to receive in any month more than
(***).

                           ARTICLE II: CONTRACT TERM

     This contract shall be effective January 1, 1995. It shall remain in full
force and effect for a primary term of five (5) years beginning on the effective
date, and continuing thereafter, unless and until terminated by either party by
the giving of written notice of termination to the other party of at least (***)
months in advance of the date of termination specified in such termination
notice, which date of termination so specified shall be the last day of the
primary term or the last day of any contract year thereafter. As used herein,
the term "contract year" refers to the period of (***) commencing January 1,
1995, and to each succeeding twelve-month period.

                              ARTICLE III: PRICE

                                     (***)

                          ARTICLE IV: SPECIFICATIONS
<PAGE>
 
     All of the ethylene sold and purchased hereunder shall meet the
specifications set forth in Exhibit "A" attached hereto and by this reference
made a part hereof as fully as though herein set forth at length.

                    ARTICLE V: DELIVERY AND TITLE TRANSFER

     Deliveries of ethylene hereunder shall be made to BUYER at the point of
delivery, which shall be the inlet of the first flange of BUYER's pipeline from
SELLER's meter, or meter designated by SELLER, in BUYER's Texas City, Texas
facility,or other mutually 6 agreed locations. Title and risk of loss shall pass
from SELLER to BUYER at said point of delivery.

     BUYER shall have no responsibility or liability on account of anything
which may be done, happen or arise with respect to ethylene before delivery, and
SELLER shall have no responsibility or liability on account of anything which
may be done, happen or arise with respect to ethylene after delivery. SELLER
shall bear all costs of transporting the ethylene to said point of delivery, and
BUYER shall bear all costs of transporting the ethylene from said point of
delivery. Delivery shall be made at the pressure agreed to by BUYER and SELLER,
and in a manner typical of industry practices.

                            ARTICLE VI: MEASUREMENT

     SELLER or its designee shall install, maintain, and operate facilities
whereby the volume of ethylene delivered by SELLER to BUYER is measured and the
temperature and pressure recorded, and BUYER shall grant to or arrange for
SELLER or its designee all necessary rights and easements for the installation,
maintenance, operation, and removal of said meter and facilities. BUYER shall
provide all utilities necessary for the operation of the meter station. BUYER,
if it so elects and gives notice of such election to SELLER, shall have the
right to observe the periodic recalibration of such meter and facilities, to be
made at SELLER's expense as often as necessary but no less frequently than once
each month. BUYER may, at its option and at its sole cost and expense, install a
check meter at said point of delivery; and in the event it does so, SELLER will
furnish BUYER with information to permit BUYER to duplicate SELLER's meter.

     The volume of ethylene delivered by SELLER hereunder each day shall be
determined by reference to daily readings of SELLER's meter. For this purpose, a
day shall be construed to extend from 7:00 a.m. on one day to 7:00 a.m. on the
next succeeding day, and correction factors and calculations from such 
<PAGE>
 
meter readings for the purpose of determining the daily quantities of ethylene
delivered hereunder shall conform with procedures mutually agreed upon by the
parties. Such daily quantities shall be converted to pounds of ethylene in
accordance with the method set forth in Exhibit "B" attached hereto and by this
reference made a part hereof as fully as though herein set forth at length.

    In the event representatives of the parties hereto are unable to agree (1)
on whether any ethylene delivered hereunder meets the specifications set forth
in Article IV hereof, or (2) on the measurement of any ethylene delivered
hereunder  for which provision is made in this Article Vl, or (3) on the
determination of pounds of ethylene delivered hereunder in accordance with the
methods prescribed in Exhibit "B", any and all such disputes shall be resolved
either by Chas. Martin Inspectors of Petroleum, Inc., or E. W. Saybolt and
Company, at the election of the party raising the question, or if neither shall
accept the assignment to resolve the dispute, then by such other recognized
referee as may be agreed upon by the parties. The decision of such referee with
respect to such matters shall be final, conclusive, and binding on each of the
parties hereto and the charges of such referee shall be borne equally by the
parties.

                      ARTICLE VII: INVOICING AND PAYMENT

     SELLER shall invoice BUYER for ethylene sold and purchased hereunder no
more often than once during each calendar month for the preceding months' sales.
Such invoices shall be dispatched promptly by SELLER, telegraphically or
otherwise, so as to be received by BUYER within three (3) days of the date of
invoice. Payment shall be made by BUYER to SELLER on or before the 15th day
following the date of each invoice by telegraphic transfer or other means
satisfactory to SELLER, of immediately available funds to SELLER's account at
such bank or depository as is designated in the invoice. Late payments for
purchases shall be assessed a delinquency charge on a daily basis at the rate
equivalent to the Chase Manhattan Bank prime rate plus one (1) percent on the
unpaid balance (excluding late payments due to SELLER's invoicing errors). In no
event shall the delinquency charge exceed the legal maximum.

     It is agreed that SELLER may decline to make deliveries of ethylene under
this contract except for cash payable upon delivery whenever SELLER shall have
reasonable doubt as to BUYER's financial responsibility and shall so advise
BUYER, whereupon BUYER shall have the privilege of satisfying SELLER as to
BUYER's financial responsibility. If SELLER is so satisfied, deliveries may be
resumed hereunder on the terms provided in the first paragraph of this Article
Vll. SELLER may exercise its 
<PAGE>
 
rights under this Article Vll at any time and from time to time during the
continuance of this contract.

                              ARTICLE VIII: TAXES

     In addition to the price of ethylene hereunder, BUYER shall assume
liability for and pay all taxes associated with the sale, use or delivery of
ethylene under this contract, including all new or increased taxes, excise taxes
including Superfund taxes, fees, or other charges (but excluding taxes based
upon net income, altemative minimum taxable income, excess profits, corporate
franchise taxes and property taxes), imposed by any governmental authority upon
the sale, use or delivery of the ethylene sold hereunder, including but not
limited to, any and all taxes associated with the manufacture of ethylene. If
BUYER is exempt from the payment of such taxes, fees or other charges, BUYER
shall furnish to SELLER proper exemption certificates to cover the ethylene
purchased  hereunder. All  other  taxes, fees or governmental charges shall be
for SELLER's account.

                              ARTICLE IX: RECORDS

     To the extent that records of either party are to be used in the
administration of this contract, the party whose records are to be used agrees
to keep true and correct records pertaining to this contract and all
transactions related thereto and to maintain such records for a period of at
least two (2) years after termination of this contract. On written request by
either party and at such party's expense, such party may have a firm of
independent certified public accountants audit any and all such records of the
other party at any time or from time to time for the purpose of confirming the
accuracy of such records and the manner in which such records have been used in
the administration of this contract; provided, however, that such accountants
shall not disclose to the party requesting the audit any information obtained
during such audit and shall only report to such party the results of the audit
and whether same shows compliance with the terms of this contract, or as the
case may be, the respects in detail in which the terms of this contract have not
been complied with. The right to audit such records shall expire two (2) years
after termination of this contract.

                               ARTICLE X: NOTICES

     All notices provided for herein shall be considered as properly given if in
writing and delivered personally or sent by overnight courier, telex, telefax,
or registered or certified mail return receipt requested and postage prepaid,
duly directed to the post office addresses of the parties hereto:
<PAGE>
 
BUYER:    Sterling Chemical, Inc.
          1200 Smith Street, Suite 1900
          Houston, Texas 770024312
          Attn: Director-Commercial
          Telefax: (713)-654-9551

SELLER:   Phillips Chemical Company,
            a division of Phillips
            Petroleum Company
          8 Adams Building
          Bartlesville, Oklahoma 74004
          Attn: Ethylene Director
          Telefax: (918)-662-1016

or at such other address as either party shall from time to time designate for
the purpose by registered or certified letter, properly addressed, with
sufficient postage prepaid and return receipt requested, addressed to the other
party. The date of service of a notice served by mail shall be the date on which
such notice is received as shown by a green receipt card from the United States
Post Office or other messenger service. The date of service of a notice
transmitted by any other means shall be the date received.

                              ARTICLE XI: CLAIMS

    No claim of any kind, whether as to ethylene delivered (whether or not
conforming to specifications) or for nondelivery of ethylene and whether or not
based on negligence, shall be greater in amount than the purchase price of the
ethylene in respect of which such claim is made. IN NO EVENT SHALL A PARTY BE
LIABLE TO THE OTHER PARTY FOR SPECIAL, INDIRECT, CONSEQUENTIAL, OR PUNITIVE
DAMAGES, WHETHER OR NOT CAUSED BY OR RESULTING FROM THE NEGLIGENCE OF THE PARTY
IN THE PERFORMANCE OF DUTIES UNDER THIS CONTRACT. BUYER shall notify SELLER
within forty (40) days of date of delivery of any claim, and failure of BUYER to
make such claim within forty (40) days shall operate as a waiver of any claim.

                          ARTICLE XII: FORCE MAJEURE

     No liability (except payment by BUYER for ethylene sold hereunder) shall
result to either party from delay in performance or nonperformance arising from
any cause or causes reasonably beyond the control of the party affected,
including but not limited to the following, which shall be deemed to be beyond
the reasonable control of such party: acts of God; fire, flood, war, accident;
labor trouble (from whatever cause); shortage of or inability to obtain any
goods deliverable hereunder or raw materials therefor from such party's existing
or intended sources 
<PAGE>
 
of supply; shortage of or inability to obtain equipment or transportation; or
compliance with any law, regulation, order, direction or request made by
governmental authority or person purporting to act therefor.

     When such cause or causes result in a reduction in the amount of ethylene
available from SELLER's production facilities, SELLER shall allocate its
available supply of ethylene among its contract customers,  and  among  its  own
operations (including its subsidiaries and affiliated companies), on a pro-rata
basis using average annual volume commitments, where ranges exist, as a
reference point. Deliveries pursuant to such allocation shall be in complete
discharge of SELLER's obligation hereunder for so long as such cause or causes
continue.

     When such cause or causes result in a reduction in the amount of ethylene
that is consumed at BUYER's facilities, BUYER shall allocate its available
ethylene consumption capacity among its contract suppliers, including affiliates
of BUYER, on a pro-rata basis using average annual volume commitments, where
ranges exist, as a reference point. Purchases pursuant to such allocation shall
be in complete discharge of BUYER's obligation hereunder for so long as such
cause or causes continue. Deficiencies in deliveries of ethylene hereunder by
reason of any such cause or causes shall be canceled from the contract with no
liability to either party therefor.

     If a Force Majeure declaration by SELLER meets the following uiteria, then
BUYER shall have an alternate supply option. The Force Majeure declaration must
be in effect for more than (***), and the allocation level must be considered to
be a significant reduction in the supply to BUYER (an allocation of (***) or
less of the contract commitment provided in Article I without regard to (***) to
activate the alternate supply option. With written notification of thirty (30)
days prior to the end of the (***) period, BUYER may request an alternate supply
or release from the volume commitment for the remaining term of the contract for
the amount affected by Force Majeure. SELLER then has (***) from receipt of
BUYER's notification to respond to BUYER with the following options:
    (a) SELLER may  satisfy  BUYER's minimum  remaining  monthly contractual
    quantity (excluding volume under Force Majeure for the ninety (90) day
    period set forth above) through means outside SELLER's normal supply
    channels, such as outside ethylene purchases, loans, or exchanges, at a cost
    to BUYER equivalent to the price under this contract, or SELLER may supply
    ethylbenzene containing an equivalent quantity  of ethylene at an agreed
    upon price.
    (b) If SELLER and BUYER cannot agree to a mutually acceptable supply option
    under subparagraph (a), then BUYER is released 
<PAGE>
 
    from the volume obligation for the amount covered by the Force Majeure
    declaration for the remaining period of the contract. The contract volume in
    effect at the end of the (***) period shall then become the volume
    commitment set out in Article I above (***).

     A party affected by force majeure shall promptly notify the other party
(and shall confirm such notification in writing) explaining the date such event
commenced and the nature, details and expected duration thereof. The affected
party shall advise the other from time to time as to progress in remedying the
force majeure situation and as to the time when the affected party expects to
resume the performance of its obligations and shall notify the other as to the
expiration of any such event as soon as the affected party knows thQ date
thereof.

                             ARTICLE XIII: WAIVERS

     The right of either party to require strict performance by the other party
of any or all obligations imposed upon such other party by this contract shall
not in any way be affected by previous waiver forbearance or course of dealing.

                            ARTICLE XIV: WARRANTIES

     SELLER warrants    that all ethylene delivered hereunder will comply with
the specifications set forth in Exhibit "A", that said ethylene  will  have been
produced in compliance  with the requirements of the Fair Labor Standards Act of
1938, as amended, and that SELLER will convey good title thereto.

     THE FOREGOING WARRANTIES ARE EXCLUSIVE, AND ARE IN LIEU OF ALL  OTHER
WARRANTIES (WHETHER WRITTEN OR ORAL, EXPRESS OR IMPLIED), INCLUDING, WITHOUT
LIMITATION, WARRANTY OF MERCHANTABILITY AND WARRANTY OF FITNESS FOR A PARTICULAR
PURPOSE.

                           ARTICLE XV: ASSIGNABILITY

     All of the terms, conditions, and provisions hereof shall extend to and be
binding upon the respective parties hereto, their successors and assigns;
provided, however, that neither party shall assign this contract or any interest
herein without the prior written consent of the other party; except that either
party may, without the consent of the other, assign this contract or any
interest herein to any company of which it is a subsidiary or to any fifty
percent (50%) or more owned subsidiary or affiliated company (but in such event,
the party assigning shall not be relieved of its primary liability hereunder to
the other party hereto), or to a corporation with which such party merges or to
which such party's assets used in the performance
<PAGE>
 
hereunder shall be sold and conveyed during the term hereof. However, BUYER has
the right to assign this Contract to any party acquiring all or substantially
all of BUYER's assets or styrene facility (located in Texas City, Texas).

                       ARTICLE XVI: ENTIRETY OF AGREEMENT

     This instrument contains the entire agreement between the parties hereto
regarding the sale, purchase and delivery of ethylene during the period provided
herein; and all  prior promises, agreements or warranties, written or verbal,
shall be cancelled and superseded hereby and shall be of no further force or
effect unless embodied herein. No modifications of this contract shall be valid
unless in writing and signed by both parties, and  no  modifications shall be
effected  by  the acknowledgment or acceptance of any purchase orders or printed
forms containing different conditions.

                          ARTICLE XVII: APPLICABLE LAW

     The validity, interpretation and performance of this contract shall be
governed by the laws of the State of Texas. IN WITNESS WHEREOF, this contract is
executed in duplicate for each party by and through its respective officers duly
authorized, as of the date first above written.

PHILLIPS CHEMICAL COMPANY,
     A DIVISION OF
     PHILLIPS PETROLEUM COMPANY
By: /s/ Guy Sutherland
(Guy Sutherland)
Title: Sr. V.P.
KGK mpH/sterconU April 3,1995


STERLING CHEMICAL. INC.
BY: /s/ Robert W. Roten
(Robert W. Roten)
Title: Executive V.P. and Chief Operating Officer
<PAGE>
 
EXHIBIT A

PHILLIPS CHEMICAL COMPANY
ETHYLENE PRODUCT SPECIFICATION

<TABLE>
<CAPTION> 
                  
PROPERTY               UNITS    MINIMUM    MAXIMUM     TEST METHOD
<S>                    <C>      <C>        <C>         <C> 
Ethylene Purity        mol%      99.85%                GC
Ethane                 ppm mol               1500      PPC 6605-AG-1
Methane                ppm mol               1000      PPC 6605-AG-1
Acetylene              ppm mol                 5       PPC 8705-AG
Alcohols as Methanol   ppm wt                 20       PPC 6605-AG
Carbon Dioxide         ppm mol                10       PPC 6605-AG-1
Carbon Monoxide        ppm mol                 5       PPC 6605-AG-1
Hydrogen               ppm mol                 5       PPC 6605-AG-1
Other Olefins          ppm mol                100      PPC 6605-AG-1
Oxygen                 ppm mol                 5       PPC 6605-AG-1
Total Sulfur           ppm wt                  2       ASTM D-3246
Water                  ppm wt                  5       PPC 6316 EK
</TABLE>
<PAGE>
 
                                   EXHIBIT B
Method of Conversion of Volumes of Ethylene to Pounds of Ethylene.

The pounds of ethylene delivered daily shall be determined in accordance with
the method outlined in the booklet entitled "Phillips Chemical Company Ethylene
Flow Measurement Manual" as revised January 1, 1985. The methods of gas flow
measurement and the methods of gas volume computation outlined in the manual
referred to above will be controlling; provided, however, that revisions in the
aforesaid manual may be made at any time during the life of this contract upon
agreement by both parties.

<PAGE>
                                                                   Exhibit 10.52
 
***OMITTED INFORMATION DENOTED BY ASTERICS (***) HAS BEEN FILED SEPARATELY WITH
THE COMISSION AND IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST.***

                               CHEMICAL PRODUCTS
                          SALES AGREEMENT - ETHYLENE

THIS AGREEMENT between LYONDELL PETROCHEMICAL COMPANY, with an office at 1221
McKinney, Houston, Tx 77010, hereinafter referred to as "SELLER," and STERLING
CHEMICALS, INC., with an office at 1200 Smith Street, Suite 1900, Houston, Tx
77002, hereinafter referred to as "BUYER";

                              W I T N E S S E T H:

SELLER agrees to sell and BUYER agrees to purchase and pay for Product in
accordance with the provisions below:


1. PRODUCT AND SPECIFICATIONS: Ethylene meeting specifications set forth in
Exhibit A, attached hereto ("Product").
 
2. QUANTITY: BUYER is obligated to buy a minimum quantity of (***) of BUYER's
Texas City, Texas facility's ethylene requirements (the "Annual Minimum")
estimated to be (***) of Product annually ("Estimated Annual Minimum") and (***)
of Product monthly ("Estimated Monthly Minimum".) SELLER is obligated to sell up
to a maximum quantity of (***) of Product annually (the "Annual Maximum") and
(***) lbs. of Product monthly ("Monthly Maximum".)

In the event BUYER's Product purchase orders from SELLER fall below the
Estimated Annual Minimum, BUYER shall ensure that BUYER's Product purchases from
SELLER are no less than the Annual Minimum.  In the event BUYER gives timely
shipment orders for Product and SELLER, without excuse, does not deliver Product
ordered up to the Monthly Maximum(as may be limited by the Annual Maximum),
SELLER shall not sell ethylene to other customers, except proportionately
equivalent shares of the maximum quantity obligations under term sales contracts
with such customers.

In the event that BUYER's annual Product purchases fall below the Estimated
Annual Minimum in any year, SELLER may elect to reduce the Estimated Annual
Minimum and Annual Maximum for all subsequent years by up to the difference
between Estimated 

                                       1
<PAGE>
 
Annual Minimum and the actual quantity purchased in said year, upon written
notice to BUYER no later than the (***) following the year of such purchase
shortfall. In the event of such reduction, the Annual Minimum, Estimated Monthly
Minimum and Monthly Maximum shall be reduced by the same percentage as the
Annual Minimum is reduced. SELLER's rights under this paragraph shall supplement
all other rights available to SELLER under this Agreement. Exercise by SELLER of
the rights under this paragraph shall not constitute a waiver of any other
rights SELLER may have.


3. TERM: January 1, 1995, to December 31, 1999, inclusive, and continuing from
year to year thereafter, unless terminated on December 31, 1999, or on any
December 31, thereafter by either party giving written notice of termination not
less than 1 year prior to the effective date of termination.

 
4. (***)


5. COMPETITIVE OFFERS: If BUYER receives a bona fide offer to sell to it,
Product of similar Annual Maximum and quality for shipment to the same delivery
points covered by this proposal, for a term not less than the remaining term of
the agreement, from a responsible domestic manufacturer not affiliated with
BUYER, at a price lower than that provided under this Agreement, then BUYER
shall give SELLER written notice thereof and SELLER will, at its option (if
satisfied as to the facts surrounding said lower price) give BUYER written
notice within 10 days thereafter of its intent to either (1) meet such lower
price, or (2) "Release" BUYER from its obligation to purchase from SELLER such
quantities during the offer period provided that BUYER accepts the offer and
buys the quantity offered at the lower price. In the event that SELLER meets a
competitive offer under the terms of this Article, BUYER shall not, during the
offer period, use a competitive offer from the same supplier or an affiliate of
the same supplier, as the basis for seeking or requesting another "meet
competition" price or other form of price concession from SELLER. Such
subsequent competitive offers are not bona fide for the purpose of this
agreement.

Dissimilar product exchanges, barters, processing agreements, transactions tied
to or contingent upon other agreements, and any other arrangements other than a
direct purchase of Product, are not deemed offers to sell or to buy for the
purpose of this Article.

Any quantity of Product sold, or to be sold, hereunder by SELLER, at a "meet
competition" price, due to SELLER's having given a price concession in response
to a qualified competitive offer, shall be purchased by BUYER from SELLER at the
original "meet competition" price for the duration of the offer period, i.e.,
such Product is not eligible for rebate or for additional discounting during
such period.

If SELLER Releases BUYER, SELLER may, at its sole discretion, elect to reduce
the Estimated Annual Minimum and  Annual Maximum for the remainder of the
Agreement 

                                       2
<PAGE>
 
term subsequent to the period of Release; such annual quantity reduction to be
equal to the quantity Released. In such event, the Annual Minimum, Monthly
Minimum and Monthly Maximum shall be reduced by the same percentage as the
Estimated Annual Minimum is reduced. Such option shall be exercised by written
notice by SELLER to BUYER not later than 20 days prior to the date in which the
competitive offer Release period ceases to be effective.

6. TRANSPORTATION TERMS:  Product delivered via pipeline to BUYER's
Texas City, Texas plant or other mutually agreed upon locations ("Delivery
Point").
 
7. TITLE AND RISK OF LOSS:  Title and risk of loss to Product will pass
from SELLER to BUYER at the Delivery Point, when Product passes the connecting
flange of the delivering pipeline to the receiving pipeline.
 
8. SHIPMENT ORDERS:  Buyer shall give SELLER shipping instructions at
least five days prior to the date on which shipments are requested to be
scheduled.
 
9. DETERMINATION OF QUANTITY:  SELLER will operate or cause to be
operated a meter whereby quantities of Product delivered will be measured and
its temperature and pressure recorded.  The volume of Product delivered,
pursuant to the Agreement, for each day will be determined by reference to daily
readings of SELLER's meter.  A day will be deemed the period from 7:00 a.m. on
one day to 7:00 a.m. on the next succeeding day. Correction factors and
calculations from such meter readings for the purpose of determining the daily
quantities of Product delivered will conform with procedures set forth below.
If the parties are unable to agree, procedures and quantities will be determined
by E. W. Saybolt and Company or such other mutually agreed upon inspector, whose
determination will be binding upon the parties who will equally bear the cost of
such independent inspector.

SELLER agrees to calibrate flow meters, pressure recorders, and temperature
recorders at least once a month and at other times as may be agreed upon by the
parties.  If a third party is used to make the delivery to BUYER, the frequency
of calibrations will be consistent with the third party's normal operating
practices.  BUYER will have the right to witness the calibrations.

Following such calibrations, any equipment found to be inaccurate to any degree
will be adjusted immediately to measure accurately.  If following a calibration,
any metering equipment is found to be inaccurate by one-half percent (0.5%) or
more, then the quantity of Product previously delivered will be retroactively
adjusted at the rate of such inaccuracy for any period of inaccuracy which is
definitely known or agreed upon, but in case the 

                                       3
<PAGE>
 
period is not definitely known or agreed upon, then for a period deemed to be
one-half (1/2) of the number of days from the last previous calibration until
the correction not exceeding, however, fifteen days.

If for any reason the custody transfer meters are out of service so that the
quantity of material delivered through such meters cannot be ascertained, the
quantity of material delivered during the period the meters are out of service
will be estimated and agreed upon by the parties upon the basis of the best
available data, using in order of preference the following methods:

     (a)  By using the registration of any check measuring equipment of BUYER,
          if installed and properly operating.

     (b)  By using any measurement equipment which SELLER may have in the
          flowing stream if agreed upon by BUYER.

     (c)  By a third party mutually agreed upon by the parties.

All quantities of Product will be corrected for temperature to sixty degrees
Fahrenheit (60.F) in accordance with current methods which are set forth in
American Petroleum Institute Routine Catalog Number 852-25650 (Chapter 11.3.2.1)
or other method mutually agreed to by both parties.
 
10. QUALITY AND TESTING:  Samples or on-line analysis at the mutually
agreed input sampling point will be the basis for determining compliance with
quality specifications. SELLER's or SELLER's exchange partner's laboratory
analysis or on-line analyzer will determine whether product specifications have
been met.  SELLER or SELLER's exchange partner shall continually monitor the
quality of Product introduced into the pipeline for compliance with said
specifications. However, if abnormalities develop in BUYER's plant operation,
BUYER may request that SELLER arrange, and if so requested by BUYER, SELLER will
arrange, for three representative samples to be taken daily.  Two samples will
be delivered to BUYER, and one will be retained by SELLER for analysis by
analytical test methods set forth in Exhibit A (or by SELLER approved test
methods if not set forth therein.)  SELLER shall advise BUYER of the analysis of
its sample.  If a difference in analysis is reported by BUYER and cannot be
reconciled within one week of BUYER's notice thereof, one of the samples will be
submitted to a competent outside laboratory, agreed upon by BUYER and SELLER,
for referee analysis (which analysis will be made by following the analytical
test methods set forth in Exhibit A hereof).  The cost of such independent
analysis will be borne equally by BUYER and SELLER, and the results of such
analysis will be binding.

                                       4
<PAGE>
 
11. PAYMENT AND CREDIT:  BUYER shall pay SELLER for product by
electronic funds transfer ("EFT") into SELLER's account per SELLER's
instructions, net 22 days from last day of the month.  If payment due date
occurs on a bank holiday (except Monday) or a Saturday, BUYER shall EFT not
later than the prior business day and if due date occurs on a Sunday or a Monday
bank holiday, EFT not later than the next business day.  If BUYER shall fail to
pay SELLER in accordance with said terms, SELLER shall notify BUYER in writing
of such payment default and if BUYER does not cure said default within 10 days,
or if BUYER has 3 payment defaults in a calendar year, at its option SELLER may
either (1) suspend deliveries until all indebtedness is paid in full, or (2)
place BUYER on a cash-in-advance status until arrangements are made for security
satisfactory to SELLER or, at SELLER's option, until all indebtedness to SELLER
is paid in full.  All timely payments under this Agreement shall be made without
early payment discount.  BUYER shall pay SELLER the maximum lawful rate of
interest on past due payment obligations.  Any preexisting obligation of BUYER
to make payment for Product delivered hereunder shall survive termination of
this Agreement for any reason.

Prior to the commencement of deliveries of Product hereunder, and at any time
and from time to time thereafter upon demand from SELLER, BUYER shall provide
SELLER such credit information as may reasonably be required by SELLER to
determine BUYER's creditworthiness.  If at any time, in the reasonable opinion
of SELLER, the financial responsibility of BUYER may be impaired or
unsatisfactory such that SELLER reasonably believes that BUYER may no longer
fulfill SELLER's reasonable requirements for unsecured credit on sums owed on
outstanding invoices plus for future Product orders  SELLER shall have the right
to require BUYER to provide SELLER with the most recent audited or unaudited
cash flow data and other financial information relevant to BUYER's ability to
pay.  Upon such request and until analysis of such information is completed, not
to exceed two business days after such information is provided (during which
time SELLER shall not disclose the suspension to any third party), or if such
information fails to reasonably substantiate BUYER's ability to pay, SELLER
shall have the right to restrict or suspend Product deliveries unless BUYER pays
on a cash-in-advance of delivery basis or, at BUYER's option, BUYER posts a
suitable letter of credit covering up to two months of receivables, from a
reliable financial institution. Alternatively, at SELLER's option, BUYER and
SELLER may make other arrangements to secure future transactions hereunder.  If
deliveries are suspended, or if deliveries are secured as provided herein, and
BUYER subsequently furnishes SELLER  with sufficient evidence of financial
responsibility, then SELLER shall immediately resume Product deliveries or
rescind the security requirements, as applicable.  If SELLER's suspension of
shipments or demand for security under this paragraph of Section 11 is
determined to be arbitrary and capricious, SELLER shall be liable to BUYER for
direct costs and compensatory damages arising therefrom.

12. TAXES:  Any tax (other than income, ad valorem or franchise
tax) , excise, fee, or other charge or any increase therein, now or hereafter
imposed directly or indirectly by law upon Product, components of Product, or
raw material from which Product is derived, 

                                       5
<PAGE>
 
or on the production, manufacture, storage, sale, transportation or delivery
thereof, which SELLER is required to pay or collect, including, without
limitation, Superfund excise taxes and taxes on gasoline blend stocks and
additives, shall, at SELLER's option, be paid by BUYER in addition to the price.
It is the intent of the parties that any such tax may be passed on via explicit
surcharge to BUYER, whether included in the current invoice, or added
retroactively to price. Retroactive surcharges may include such interest for
which SELLER is liable, in case that, subsequent to the original invoice, a law,
regulation, ruling or determination of a taxing authority is deemed to cause
SELLER to be liable for the tax.

13. GOVERNMENTAL ACTION AFFECTING CONTRACT TERMS: If any governmental
action substantially affects the right to maintain or change the price or other
terms of this Agreement, then at any time such governmental action is in effect,
either party shall have the right, at its option, to (1) terminate this
Agreement upon 30 days notice to the other party, or (2) postpone, by written
notice to the other party, the effective date of any price change or change of
other terms to the extent so affected until such date or dates as it is not so
affected.  By its election to postpone rather than terminate, the party does not
waive its right to terminate thereafter.
 
14. OFFSETS:  In the event of BUYER's default in payments or in its
quantity purchase obligations hereunder, SELLER may offset damages arising
therefrom, including, without limitation, withholding payment, delivery or
acceptance of product, material or services, relating to any agreement or
transaction with BUYER, its subsidiaries or affiliates.
 
15. CLAIMS:  All claims of BUYER with respect to the measurement and
evaluation of quality or quantity of Product sold and delivered pursuant to this
Agreement, shall be deemed waived and forever barred, unless BUYER notifies
SELLER of the nature and details of the claim in writing within (***) after
receipt of the shipment by BUYER. Any such claim which is not asserted as a
claim, counterclaim, defense or set-off in a judicial proceeding instituted
within 2 years after the cause of action arises shall be forever waived, barred
and released.

BUYER assumes all risk and responsibility for handling the Product, for the
results obtained by the use of the Product in manufacturing processes or
otherwise, and for the results obtained by the use of said Product in
combination with other substances.  If any description, advice or suggestion is
given, it is given and accepted at BUYER's risk, and SELLER shall not be
responsible or liable therefor or for the results thereof.

                                       6
<PAGE>
 
16. PRODUCT HAZARDS:  BUYER acknowledges that it has been adequately
warned and understands the warnings by SELLER of the risks associated with
handling, shipping, storing, using and disposing of the Product, including,
without limitation, those set forth in SELLER's Material Safety Data Sheet for
Product ("MSDS").  BUYER further acknowledges it is familiar with the Product
and has independent knowledge of such risks, which are known in BUYER's
industry.  BUYER shall maintain compliance with all safety and health related
governmental requirements concerning Product and shall take all reasonable and
practicable steps to inform, warn and familiarize its employees, agents,
contractors and customers with all hazards associated with the Product,
including handling, shipment, storage, use and disposal.  BUYER shall not
deliver or consign commercial or sample quantities of Product to any Party whom
BUYER reasonably believes will handle, ship, store, use or dispose of said
Product in a dangerous manner or contrary to law or the advice of SELLER.
 
17. INDEMNIFICATION:  SELLER shall indemnify BUYER Group for Liability
and Costs relating to Product Incidents which occur while, SELLER its employees,
contractors, subcontractors or agents have custody of Product where such
Liability and Costs arise from or relate to any such Product Incident's harm to
SELLER or its employees, customers, contractors, subcontractors or agents
because of exposure to Product or explosion or combustion of Product.

BUYER shall indemnify SELLER Group for Liability and Costs relating to Product
Incidents which occur while BUYER, its employees, contractors, subcontractors or
agents have custody of Product where such Liability and Costs arise from or
relate to any such Product Incident's  harm to BUYER or its employees,
contractors, subcontractors or agents because of exposure to specification
conforming Product or explosion or combustion of specification conforming
Product.

"SELLER Group" means SELLER and/or any of its agents, officers, directors,
employees, contractors, representatives, and insurers.

"BUYER Group" means BUYER and/or any of its agents, officers, directors,
employees, contractors, representatives, and insurers.

To "indemnify" means to defend and fully hold harmless from and against all
liability, damages, losses, costs and expenses (including reasonable attorneys'
fees, court costs and other costs of suit), for claims, demands, suits or
judgments (hereinbefore "Liability and Costs") based on any Product related
incident causing property damage, personal injury or death (hereinbefore
"Product Incidents"), whether or not claimants allege indemnitee's negligence as
a cause.

                                       7
<PAGE>
 
18. WARRANTIES:  SELLER warrants Product shall meet the specifications
established in this Agreement.

SELLER warrants free and clear title on all Product produced by SELLER and that
such Product is produced in compliance with the requirements of the Fair Labor
Standards Act of 1938, as amended.  There are no rightful patent infringement
claims as to the Product itself available to any third party.

SELLER makes no other express or implied warranty, statutory or otherwise,
concerning the Product, including without limitation, no warranty of fitness for
a particular purpose, warranties of merchantability, or warranties as to quality
or correspondence with description or sample.  SELLER does not warrant against
United States patent infringement by way of the use of the Product in
combination with other materials or in the operation of any process.

19. LIMITATION OF DAMAGES: BUYER'S exclusive remedy for any and all delivery
shortfalls or contamination of Product sold under this Agreement, including, but
not limited to, any allegations of breach of warranty, breach of contract,
negligence or strict liability, shall be limited, at SELLER's option, to either
the payment for then current market value cover costs incurred to replace such
Product, or the replacement of the Product for which a valid claim is made. In
the event of any such delivery shortfalls or contamination, SELLER shall not
be liable to BUYER for any lost or prospective profits or any other special,
consequential, incidental or indirect losses or damages from the sale of Product
under this agreement or for any failure of performance related hereto. This
limitation does not affect either party's rights respecting claims for personal
injury (including death) or physical property damage.
 
20. FORCE MAJEURE AND ALLOCATION:  Neither Party shall be responsible
for any loss and or damage resulting from any delay in performing or failure to
perform any provisions of this Agreement (other than BUYER's obligation to make
payments for Product delivered under this Agreement), so long as any such
failure or delay arises from fires, floods, storms, earthquakes, tidal waves,
wars, military operations, national emergencies, civil commotions, strikes or
other differences with workers or unions, or from any delay or failure in
delivery when the supplies of either Party or the facilities of production,
manufacture, transportation or distribution which otherwise would be available
to either Party are impaired by mechanical breakdowns, or by the order,
requisition, request or recommendation of any governmental agency or acting
governmental authority, or either Party's compliance therewith or by
governmental proration, regulation or priority, or the inability of SELLER to
obtain on terms deemed by SELLER to be practicable, feedstock or other raw
material (including energy sources),  or from any other delay or failure due to
any causes beyond either party's control similar or dissimilar to any such
causes.  When such cause or causes exist, the Party so affected shall have the
right 

                                       8
<PAGE>
 
in its sole discretion to restrict or cease deliveries or receipt of Product
hereunder. SELLER's obligation to sell Product is subject to modification and
reduction in accordance with any present or future allocation program of SELLER
based upon laws, rules or regulations, orders, demand or requests of any
governmental authority.

During the continuance of any of the herein referenced contingencies, the
obligations of SELLER and BUYER shall be suspended and proportionately abated
except for BUYER's obligation to pay SELLER for Product delivered.  If, due to
any such contingency, either Party has not delivered or accepted delivery of the
contracted quantity of Product for a period of at least (***), the other Party
may terminate this Agreement by giving not less than (***) prior written notice
of termination.

Upon the occurrence of any of the Force Majeure events described in the section
hereof, the Party claiming Force Majeure shall notify the other Party promptly
in writing of such event and, to the extent possible, inform the other Party of
the expected duration of the Force Majeure event and the volumes of Product to
be affected by the termination, suspension or curtailment of performance under
the Agreement.

In the event that, at any time, the quantity of Product available from the plant
ordinarily producing Product for sale hereunder ("Plant"), should be
insufficient to fulfill SELLER's future sales volume commitments because of
Plant production shortages due to any other event reasonably related to such
shortages, SELLER, at its option, may (1)  allocate its available supply of
Product equitably among all term contract customers of SELLER during the period
of such production shortage contingency, and/or (2)  deliver Product to such
customers, including BUYER, obtained from third Party sources.


21. GENERAL:
 
A.  Assignment:  This Agreement shall be binding upon and inure to the
benefit of the successors of BUYER and SELLER, but shall not be assigned by
either Party and if assignment is attempted it shall be null and void without
the prior written consent of the other Party, which consent shall not
unreasonably be withheld, except that assignment to a parent corporation,
subsidiary of a parent corporation, or a successor to substantially all of the
chemical business of SELLER or the styrene monomer business of BUYER shall not
require the other Party's consent to become effective.
 
 
B. Governing Law:  THIS AGREEMENT IS TO BE CONSTRUED IN ACCORDANCE WITH
THE LAWS OF THE STATE OF TEXAS, WITHOUT GIVING EFFECT TO THE PRINCIPLES OF
CONFLICT OF LAWS.  IN THE EVENT OF ANY DISPUTE BETWEEN THE PARTIES, THEY SHALL
USE THEIR BEST EFFORTS TO MUTUALLY AGREE UPON AN ALTERNATIVE FORM OF DISPUTE
RESOLUTION ("ADR") BEFORE AN ADR PANEL OR ADR INDIVIDUAL IN HOUSTON, TEXAS; ANY

                                       9
<PAGE>
 
JUDGMENT ENTERED THEREUPON SHALL BE FILED ONLY IN THE STATE OR FEDERAL COURTS OF
TEXAS.  IN THE EVENT OF (a) FAILURE TO AGREE ON ADR METHOD, (b) FAILURE TO
CONSENT TO A NON-BINDING ADR DECISION, OR (c) APPEAL OF, OR CHALLENGE TO, AN ADR
DECISION, THEN ANY LEGAL ACTIONS FILED MAY BE BROUGHT ONLY IN THE STATE OR
FEDERAL COURTS AT HOUSTON, TEXAS.
 
 
C. Duty Drawback:  BUYER shall obtain and complete U.S. Customs Bureau
forms and any other documentation required for duty drawback credits for BUYER's
exports of eligible goods derived from or containing Product.  SELLER will first
claim any available drawback on any and all Products eligible for drawback which
are exported by SELLER or its agent.  SELLER shall then transmit to BUYER the
Certificates of Delivery/Manufacture for remaining drawback Product available to
SELLER as are necessary to file said drawback claim.  Such drawback Product
shall be allocated by SELLER among SELLER's customers if the remaining
quantities of drawback Product which may be covered by the Certificates are
insufficient to cover export quantities eligible for drawback.  BUYER shall file
a duty drawback entry for the maximum quantity of eligible Product covered by
the Certificates furnished to BUYER and transmit (***) of all proceeds obtained
to SELLER.
 
D. No Waiver:  Failure of either Party to require performance of any
provision of this Agreement shall not affect either Party's right to require
full performance thereof at any time thereafter, and the waiver by either Party
of a breach of any provisions hereof shall not constitute a waiver of a similar
breach in the future or of any other breach or nullify the effectiveness of such
provision.
 
 
E. Entire Agreement:  This Agreement and any attachments or addenda
hereinafter set forth contain the entire agreement between the parties hereto
and there are no oral representations, stipulations, warranties, agreements or
understandings with respect to the subject matter of this Agreement which are
not fully expressed herein.  Neither this Agreement nor its execution has been
induced by any representation, stipulation, warranty, agreement or understanding
of any kind other than those herein expressed.
 
F. No Modification:  No amendment, addition to, alteration,
modification or waiver of all or any part of this Agreement shall be of any
force or effect, whether by course of conduct or otherwise, unless in writing
and signed by SELLER and BUYER.  If the provisions of this Agreement and the
provisions of any purchase order or order acknowledgment written in connection
with this Agreement conflict, then the provisions of this Agreement shall
prevail.

                                       10
<PAGE>
 
G. Notices:  Any notices given under this Agreement shall be in writing
and addressed to the other Party at the address specified in the first paragraph
of this Agreement.  Notice may be given by U.S. mail (first class or certified),
any personal delivery service, fax, or telex.  Any notice required or permitted
hereunder shall be deemed given upon the earlier of (1) the day of actual
receipt by the Party to whom notice is being given or the following business day
if actual receipt is during a non-business day of the receiving Party or is
after regular business hours on a business day of the receiving Party, or (2)
the fourth day after being deposited postage prepaid in the U.S. Mail as first
class mail.  Notice by fax or telex shall be deemed to be in actual receipt upon
the completion of transmission to the receiving Party.  For purposes hereof, all
notices to SELLER shall be directed to the attention of the Commercial Manager,
Light Olefins; and if faxed, transmitted to the Commercial Manager, Light
Olefins at (713) 652-7383; and all notices to BUYER shall be transmitted to
Elizabeth A. Trent, Raw Material Coordination Manager or successor; and if
faxed; transmitted to Elizabeth A. Trent, Raw Material Coordination Manager or
successor at (713) 654-9551.

If, prior to the execution of this document by both parties, SELLER delivers
Product to BUYER and BUYER receives Product from SELLER at any time within the
Term stated herein, any such transactions will be governed by the terms and
conditions hereof, except for any such terms or conditions expressly rejected in
writing by BUYER prior to Product delivery, the parties by their conduct
agreeing to be so bound.  The parties recognize and agree that neither shall be
obligated by their course of conduct to perform any future transactions
hereunder unless and until this document is fully executed.

IN WITNESS WHEREOF, SELLER and BUYER have executed this Agreement effective as
of the date first above written.

 LYONDELL PETROCHEMICAL COMPANY      STERLING CHEMICALS, INC.
 
           (SELLER)                          (BUYER)
 
  By: /s/ Bob G. Gower              By: /s/ James S. Williams
 
  Print Name: Bob G. Gower          Print Name: James S. Williams
 
  Title: Chairman and CEO           Title: Director - Commercial
 
  Date: 12/20/94                    Date: December 7, 1994

                                       11
<PAGE>
 
                                   EXHIBIT A

                        ETHYLENE PRODUCT SPECIFICATIONS

<TABLE>
<CAPTION>
 
 
COMPONENT                           CONTRACT     TEST METHODS
                                 SPECIFICATION
<S>                              <C>             <C>
 
Ethylene; mol %                    99.85 min.    ASTM D 2505
 
Methane; mol %                      0.1 max.     ASTM D 2505
 
Ethane; mol %                       0.15 max.    ASTM D 2505
 
Propylene and Heavier; mol ppm      100 max.     ASTM D 2505
 
Carbon Monoxide; wt. ppm             5 max.      ASTM D 2504
 
Carbon Dioxide; wt. ppm              10 max      ASTM D 2505
 
Sulfur; wt. ppm                      5 max.      ASTM D 3246
 
Water; wt. ppm                       10 max.     LYON 5981
 
Acetylene; wt. ppm                   5 max.      ASTM D 2505
 
Oxygen; wt. ppm                      5 max.      ASTM D 2504
 
Hydrogen; wt. ppm                     5 max      ASTM D 2504
 
Ammonia, wt. ppm                      1 max      LYON 5234

Methanol; wt. ppm                    10 max      LYON 5881
</TABLE>

                                       12
<PAGE>
 
                                   EXHIBIT B
                                   
       Method of Conversion of Volumes of Ethylene to Pounds of Ethylene

     The pounds of ehtylene delivered daily shall be determined in accordance
with the method outlined in the booklet entitled "Phillips Chemical Company
Ethylene Flow Measurement Manual" as revised January 1, 1985.  The methods of
gas flow measurement and the methods of gas volume computation outlined in the
manual referred to above will be controlling; provided, however, that revisions
in the aforesaid manual may be made at any time during the life of this contract
upon agreement by both parties.

                                       13

<PAGE>
 
                                                                  Exhibit 10.55*

***OMITTED INFORMATION DENOTED BY ASTERISKS (***) HAS BEEN FILED SEPARATELY WITH
THE COMISSION AND IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST.***

                                    BUSINESS
                                  CONFIDENTIAL
                            PRODUCT SUPPLY AGREEMENT
                                    BETWEEN
                       PRAXAIR HYDROGEN SUPPLY, INC. AND
                            STERLING CHEMICALS, INC.

                                  May 15, 1995
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE>
<S>                         <C>                                       <C>
ARTICLE 1                                                             2
 DEFINITIONS                                                          2
 Section 1.1                "Adjustable Facility Fee"                 2
 Section 1.2                "Affiliate"                               2
 Section 1.3                "Agreement"                               2
 Section 1.4                "Blend Gas"                               2
 Section 1.5                "Blend Gas Contract Volume"               2
 Section 1.6                "Blend Gas Delivery Point"                3
 Section 1.7                "Blend Gas Totalizer"                     3
 Section 1.8                "Buyer's Annual Grace Period"             3
 Section 1.9                "Buyer's Blend Gas Requirements"          3
 Section 1.10               "Buyer's Carbon Monoxide Requirements"    3
 Section 1.11               "Buyer's Hydrogen Requirements"           3
 Section 1.12               "Buyer's Pipelines"                       4
 Section 1.13               "Buyer's Plant"                           4
 Section 1.14               "Buyer's Required Rates"                  4
 Section 1.15               "Carbon Monoxide"                         4
 Section 1.16               "Carbon Monoxide Contract Volume"         4
 Section 1.17               "Carbon Monoxide Delivery Point"          4
 Section 1.18               "Carbon Monoxide Totalizer"               5
 Section 1.19               "Confidential Information"                5
 Section 1.20               "Contract Volume of Products"             5
 Section 1.21               "Contract Year"                           5
 Section 1.22               "Cubic Foot"                              5
 Section 1.23               "Event of Default"                        5
 Section 1.24               "Excess Shutdown Period"                  5
 Section 1.25               "Facility Site"                           5
 Section 1.26               "Feed/Fuel Fee"                           6
 Section 1.27               "First Additional Term"                   6
 Section 1.28               "Fixed Facility Fee"                      6
 Section 1.29               "Force Majeure Event"                     6
 Section 1.30               "Ground Lease"                            6
 Section 1.31               "Guarantor"                               6
 Section 1.32               "Guaranty"                                6
 Section 1.33               "Hydrogen"                                6
 Section 1.34               "Hydrogen Contract Volume"                6
 Section 1.35               "Hydrogen Delivery Point"                 7
 Section 1.36               "Hydrogen Totalizer"                      7
 Section 1.37               "Initial Term"                            7
 Section 1.38               "Maximum Shutdown Period"                 7
 Section 1.39               "Metering Equipment"                      7
 Section 1.40               "Month"                                   7
 Section 1.41               "MSCF"                                    7
 Section 1.42               "Natural Gas"                             7
 Section 1.43               "New NG Index"                            7
 Section 1.44               "New PPI Index"                           7
 Section 1.45               "NG Base"                                 7
</TABLE> 
<PAGE>
 
<TABLE>
<S>                         <C>                                      <C>
 Section 1.46               "PPI Base"                                7
 Section 1.47               "Products"                                8
 Section 1.48               "Proprietary Rights"                      8
 Section 1.49               "Second Additional Term"                  8
 Section 1.50               "Seller's Facility"                       8
 Section 1.51               "Startup"                                 8
 Section 1.52               "Steam"                                   8
 Section 1.53               "Steam Contract Volume"                   8
 Section 1.54               "Steam Delivery Point"                    8
 Section 1.55               "Steam Fee"                               8
 Section 1.56               "Steam Totalizer"                         9
 Section 1.57               "Supplemental Hydrogen"                   9
 Section 1.58               "Term"                                    9
 Section 1.59               "Texaco Information"                      9
 Section 1.60               "Utilities Agreement"                     9
ARTICLE 2                                                             9
 STARTUP                                                              9
 Section 2.1                Startup                                   9
 Section 2.2                Seller's Penalty for Late Startup        10
 Section 2.3                Exceptions to Seller's Penalty for Delay 10
 Section 2.4                Buyer's Penalty for Late Startup         10
 Section 2.5                Exceptions to Buyer's Penalty
                             for Late Startup                        11
 Section 2.6                Obligation to Deliver after Startup      11
 Section 2.7                Covenant Regarding Delay                 11
ARTICLE 3                                                            11
 DELIVERY OF CARBON MONOXIDE                                         11
 Section 3.1                Obligation to Deliver Carbon Monoxide    11
 Section 3.2                Carbon Monoxide Pressure                 11
 Section 3.3                Title to and Risk of Loss
                             of Carbon Monoxide                      12
 Section 3.4                Carbon Monoxide Volume                   12
ARTICLE 4                                                            13
 DELIVERY OF BLEND GAS                                               13
 Section 4.1                Obligation to Deliver Blend Gas          13
 Section 4.2                Blend Gas Pressure                       13
 Section 4.3                Title to and Risk of Loss of Blend Gas   13
 Section 4.4                Blend Gas Volume                         13 
ARTICLE 5                                                            14
 DELIVERY OF HYDROGEN AND SUPPLEMENTAL HYDROGEN                      14
 Section 5.1                Obligation to Deliver Hydrogen           14
 Section 5.2                Delivery of Supplemental Hydrogen        14
 Section 5.3                Hydrogen Pressure                        14
 Section 5.4                Title to and Risk of Loss                14
 Section 5.5                Hydrogen Volume                          14
</TABLE> 
<PAGE>
 
<TABLE>
<S>                         <C>                                      <C>
ARTICLE 6                                                            15
 DELIVERY OF STEAM                                                   15
 Section 6.1                Steam Delivery Obligation                15
 Section 6.2                Title to and Risk of Loss of Steam       16
ARTICLE 7                                                            16
 SHUTDOWNS, FAILURES TO DELIVER AND FAILURES TO TAKE                 16
 Section 7.1                Seller's Maximum Shutdown Period         16
 Section 7.2                Seller's Failure to Deliver;             
                             No Force Majeure                        16
 Section 7.3                Buyer's Failure to Take;
                             No Force Majeure                        18
 Section 7.4                Seller's Failure to Deliver;
                             Seller's Force Majeure                  20
 Section 7.5                Buyer's Failure to Take;
                             Buyer's Force Majeure                   22
 Section 7.6                Mandatory Shut Down                      23
ARTICLE 8                                                            23
 PRICING AND PAYMENT                                                 23
 Section 8.1                Purchase Price for Products              23
 Section 8.2                Fixed Facility Fee                       24
 Section 8.3                Adjustable Facility Fee;
                             Feed/Fuel and Steam Fees                24
 Section 8.4                Supplemental Hydrogen                    25
 Section 8.5                Payment for Supplemental Hydrogen        26
 Section 8.6                Terms of Payment                         26
ARTICLE 9                                                            27
 TAXES                                                               27
ARTICLE 10                                                           28
 FORCE MAJEURE                                                       28
 Section 10.1               Force Majeure Events                     28
 Section 10.2               Settlement of Strikes                    29
 Section 10.3               Notice of Force Majeure                  30
ARTICLE 11                                                           30
 LIMITATION OF LIABILITY                                             30
 Section 11.1               Acknowledgement of Hazards               30
 Section 11.2               No Consequential Damages                 31
ARTICLE 12                                                           31
 SELLER'S PRODUCT WARRANTIES; DISCLAIMERS                            31
ARTICLE 13                                                           34
 REPRESENTATIONS AND WARRANTIES OF BUYER                             34
 Section 13.1               Organization, Good Standing and
                             Corporate Power                         34
</TABLE> 
<PAGE>
 
<TABLE>
<S>                         <C>                                      <C>
 Section 13.2               Authority Relative to Agreement          34
 Section 13.3               No Conflict with Other Instruments or
                             Proceedings                             34
 Section 13.4               No Litigation or Proceedings.            35
ARTICLE 14                                                           35
 REPRESENTATIONS AND WARRANTIES OF SELLER                            35
 Section 14.1               Organization, Good Standing
                             and Corporate Power                     35
 Section 14.2               Authority Relative to Agreement          36
 Section 14.3               No Conflict with Other Instruments or 
                             Proceedings                             36
 Section 14.4               No Litigation or Proceedings             36
 Section 14.5               Compliance with Laws                     37
 Section 14.6               Proprietary Rights                       37
ARTICLE 15                                                           37
 METERING EQUIPMENT                                                  37
 Section 15.1               Meter Testing                            37
 Section 15.2               Data Transmission                        38
ARTICLE 16                                                           39
 ALTERNATIVE FEEDSTOCKS                                              39
ARTICLE 17                                                           39
 EXCESS PRODUCTION                                                   39
ARTICLE 18                                                           40
 EVENTS OF DEFAULT; DISPUTE RESOLUTION                               40
 Section 18.1               Events of Default                        40
 Section 18.2               Dispute Resolution Meeting               41
 Section 18.3               Failure to Resolve Dispute; Arbitration  42
 Section 18.4               Right to Terminate Agreement             43
ARTICLE 19                                                           43
 ACCESS TO INFORMATION                                               43
 Section 19.1               Access to Information                    43
 Section 19.2               Access to Seller's Facility              44
 Section 19.3               Access to Seller's Personnel             44
 Section 19.4               Limitations on Disclosure                44
ARTICLE 20                                                           45
 CAPACITY OF SELLER'S FACILITY                                       45
 Section 20.1               Initial Capacity                         45
 Section 20.2               Capacity Expansion                       45
ARTICLE 21                                                           46
 INITIAL AND ADDITIONAL TERMS                                        46
 Section 21.1               Initial Term                             46
</TABLE> 
<PAGE>
 
<TABLE>
<S>                         <C>                                       <C>
 Section 21.2  Additional Terms                                      46
ARTICLE 22                                                           47
 MISCELLANEOUS                                                       47
 Section 22.1  Assignment                                            47
 Section 22.2  Confidentiality                                       48
 Section 22.3  Applicable Law                                        51
 Section 22.4  Notice                                                51
 Section 22.5  Waiver                                                52
 Section 22.6  Headings                                              52
 Section 22.7  Entire Agreement                                      52
 Section 22.8  Relationship between Parties                          53
 Section 22.9  Severability                                          53
 Section 22.10  Amendment                                            54
 Section 22.11  Pronouns and Plurals                                 54
 Section 22.12  Section Numbers                                      54
 
EXHIBIT A:  FEE CALCULATIONS                                        A-1
EXHIBIT B:  DESCRIPTION OF SELLER'S FACILITY                        B-1
EXHIBIT C:  PRODUCT SPECIFICATIONS                                  C-1
EXHIBIT D:  NATURAL GAS SPECIFICATIONS                              D-1
</TABLE>
<PAGE>
 
                            PRODUCT SUPPLY AGREEMENT

THIS  PRODUCT SUPPLY AGREEMENT made and entered into as  of May  15,  1995, by
and between PRAXAIR HYDROGEN SUPPLY,  INC.,  a Delaware corporation ("Seller"),
and STERLING CHEMICALS, INC.,  a Delaware corporation ("Buyer");

                           W I T N E S S E T H:

          WHEREAS,  Buyer requires substantial quantities  of  Carbon Monoxide,
Blend Gas, Hydrogen and Steam for use at Buyer's Plant, and  has  requested
Seller to supply such quantities  of  Carbon Monoxide, Blend Gas, Hydrogen and
Steam; and

          WHEREAS, Seller has represented to Buyer that it is willing and  able
to design, construct and operate, at Seller's  expense and  in accordance with
the terms of the Ground Lease, a facility for  the  production of Carbon
Monoxide, Blend Gas, Hydrogen  and Steam  on  the Facility Site from which
Seller will  be  able  to supply Carbon Monoxide, Blend Gas, Hydrogen and Steam
to Buyer on a  reliable basis, achieving an average on-stream operating  time of
(***) or better; and

          WHEREAS, in reliance on such representation by Seller, Buyer is
willing  to  shut  down  its  existing  syngas  plant,  which currently
produces  Buyer's requirements  for  Carbon  Monoxide, Hydrogen and Blend Gas
for its acetic acid and oxoalcohol  units, and rely exclusively on Seller's
Facility for its requirements of these Products;

          NOW  THEREFORE, in consideration of the foregoing  and  the mutual
representations,  warranties,  covenants  and  agreements herein contained and
the mutual benefits to be derived therefrom, Buyer and Seller agree as follows:

ARTICLE 1 - DEFINITIONS

          Unless  otherwise  stated  in  this  Agreement, the following  terms
shall have the meanings ascribed to them  below, and the following definitions
shall be equally applicable to both the singular and plural forms of any of the
terms herein defined:

          Section 1.1  "Adjustable Facility Fee" means the variable  fee
payable by Buyer to Seller as provided in Section 8.3.

          Section 1.2  "Affiliate" of a party shall mean a  corporation, at
least 50% of the voting securities of which is owned directly or indirectly by
such party; a corporation which owns directly or indirectly at least 50% of the
voting stock of such party;  or  a corporation, at least 50% of the voting
securities  of  which  is owned directly by a corporation which owns directly or
indirectly at least 50% of the voting stock of such party.

          Section 1.3  "Agreement" means this Product Supply  Agreement, as
the same may be amended from time to time in accordance  with its terms.
<PAGE>
 
          Section 1.4  "Blend Gas" means a gas mixture conforming to the
specifications set forth in Exhibit C, attached hereto and made a part hereof.

          Section 1.5  "Blend  Gas  Contract Volume" means,  during  any
Month,  Blend Gas containing an average of (***) of Hydrogen  and Carbon
Monoxide  produced by Seller's  Facility,  calculated  by dividing the total
number of pounds delivered in any Month by the hours in such Month.

          Section 1.6  "Blend Gas Delivery Point" means the flange where
Buyer's Pipelines will be connected to Seller's Facility at the Blend Gas
custody transfer point depicted in Exhibit B  attached hereto and made a part
hereof.

          Section 1.7  "Blend  Gas  Totalizer" means  Seller's  metering
equipment to be installed and maintained by Seller at Seller's Facility to
measure the quantities of Blend  Gas  delivered  to Buyer hereunder.

          Section 1.8  "Buyer's Annual Grace Period" shall have the
meaning ascribed to it in Section 7.3(b).

          Section 1.9  "Buyer's  Blend Gas Requirements" means Buyer's
total present and future requirements, in gaseous form, of Blend Gas, other
than that supplied in cylinders, for use at the oxoalcohol unit located
at Buyer's Plant up to the Blend Gas Contract Volume.

          Section 1.10  "Buyer's Carbon Monoxide Requirements" means Buyer's
total present and future requirements, in gaseous form, of Carbon Monoxide,
other than Carbon Monoxide supplied in cylinders, for use at the acetic acid and
oxoalcohol units located at Buyer's Plant up to the Carbon Monoxide Contract
Volume.

          Section 1.11 "Buyer's Hydrogen Requirements" means Buyer's total
present and future requirements, in gaseous form, of Hydrogen, other than that
supplied in cylinders, for use at the oxoalcohol unit located at Buyer's Plant
up to the Hydrogen Contract Volume.

          Section 1.12 "Buyer's Pipelines" means the system of trunk and service
pipelines to be installed, owned and operated by Buyer for the transmission of
(i) feedstocks and utilities to Seller's Facility, and (ii) Carbon Monoxide,
Blend Gas, Hydrogen (and Supplemental Hydrogen) and Steam produced by Seller's
Facility from the respective points of connection of Buyer's Pipelines with
Seller's Facility. The points at which Buyer's Pipelines will connect with
Seller's Facility are depicted in Exhibit B. 

          Section 1.13 "Buyer's Plant" means Buyer's chemical plant in Texas
City, Texas and any additions or modifications thereto and replacements thereof.

          Section 1.14 "Buyer's Required Rates" means the volume of any or all
of the Products required by Buyer, during any given Month, not to exceed the
Contract Volume of Products.

          Section 1.15 "Carbon Monoxide" means carbon monoxide conforming to the
specifications set forth in Exhibit C.
<PAGE>
 
          Section 1.16 "Carbon Monoxide Contract Volume" means during any Month
an average of (***) of Carbon Monoxide produced by Seller's Facility, calculated
by dividing the total number of pounds delivered in any Month by the hours in
such Month.

          Section 1.17 "Carbon Monoxide Delivery Point" means the flange where
Buyer's Pipelines will be connected to Seller's Facility at the Carbon Monoxide
custody transfer point depicted in Exhibit B.

          Section 1.18 "Carbon Monoxide Totalizer" means Seller's metering
equipment to be installed and maintained by Seller at Seller's Facility to
measure the quantities of Carbon Monoxide delivered to Buyer hereunder.

          Section 1.19 "Confidential Information" has the meaning ascribed to it
in Section 22.2.

          Section 1.20 "Contract Volume of Products" means, collectively or
individually, as the context requires, 100% each of the Blend Gas Contract
Volume, the Carbon Monoxide Contract Volume and the Hydrogen Contract Volume.

          Section 1.21 "Contract Year" means a period of one (1) year commencing
on the August 1 next following the date of Startup and on each subsequent
anniversary of such date during the Term; provided, however, that the period of
time commencing on the date of Startup and ending on the July 31 next following
the date of Startup shall also be a Contract Year, with appropriate prorations
to the extent such period is less than twelve months.

          Section 1.22 "Cubic Foot" means the quantity of Carbon Monoxide, Blend
Gas or Hydrogen that would occupy a volume of one cubic foot at a temperature of
60 degrees Fahrenheit and 14.696 pounds per square inch absolute pressure.

          Section 1.23 "Event of Default" shall have the meaning ascribed to it
in Section 18.1.

          Section 1.24 "Excess Shutdown Period" shall have the meaning ascribed
to it in Section 7.2.

          Section 1.25 "Facility Site" means the parcel of land that will be
leased by Buyer to Seller pursuant to the Ground Lease, as depicted on
Exhibit B.

          Section 1.26 "Feed/Fuel Fee" means the fee payable by Buyer to Seller
for Natural Gas as provided in Section 8.3 or for any alternative feedstock as
provided in Article 16.
      
          Section 1.27 "First Additional Term" has the meaning ascribed to it in
Section 21.2.

          Section 1.28 "Fixed Facility Fee" means the fixed fee payable by Buyer
to Seller as provided in Section 8.2.

          Section 1.29 "Force Majeure Event" has the meaning ascribed to it in
Section 10.1.

          Section 1.30 "Ground Lease" means that certain Ground Lease Agreement
of even date herewith between Buyer as lessor and Seller as lessee, as same may
be amended from time to time in accordance with the provisions thereof.

          Section 1.31 "Guarantor" means Praxair, Inc., a Delaware corporation,
and its successors and permitted assigns.
<PAGE>
 
          Section 1.32 "Guaranty" means that certain Guaranty Agreement of even
date herewith pursuant to which Guarantor, for the benefit of Buyer, has
unconditionally guaranteed the obligations of Seller hereunder and under the
Utilities Agreement and the Ground Lease.

          Section 1.33 "Hydrogen" means hydrogen conforming to the
specifications set forth in Exhibit C.

          Section 1.34 "Hydrogen Contract Volume" means during any Month an
average of (***) of Hydrogen produced by Seller's Facility, calculated by
dividing the total number of pounds delivered in any Month by the hours in such
Month.

          Section 1.35 "Hydrogen Delivery Point" means the flange where Buyer's
Pipelines will be connected to Seller's Facility at the Hydrogen custody
transfer point depicted in Exhibit B.

          Section 1.36 "Hydrogen Totalizer" means Seller's metering equipment to
be installed and maintained by Seller at Seller's Facility to measure the
quantities of Hydrogen (and Supplemental Hydrogen) delivered to Buyer hereunder
from Seller's Facility.

          Section 1.37 "Initial Term" has the meaning ascribed to it in Section
21.1.

          Section 1.38 "Maximum Shutdown Period" shall have the meaning ascribed
to it in Section 7.1.

          Section 1.39 "Metering Equipment" shall have the meaning ascribed to
it in Section 15.1.

          Section 1.40 "Month" means that period of time beginning at 12:01
a.m., Houston, Texas time on the first day of any calendar month and extending
to 12:01 a.m. Houston, Texas time on the first day of the following calendar
month.

          Section 1.41 "MSCF" means one thousand (1,000) standard Cubic Feet.

          Section 1.42 "Natural Gas" means natural gas delivered by Buyer to
Seller's Facility conforming to the specifications set forth in Exhibit D
attached hereto and made a part hereof.

          Section 1.43 "New NG Index" shall have the meaning ascribed to it in
Section 8.4.

          Section 1.44 "New PPI Index" shall have the meaning ascribed to it in
Section 8.4.

          Section 1.45 "NG Base" shall have the meaning ascribed to it in
Section 8.4.

          Section 1.46 "PPI Base" shall have the meaning ascribed to it in
Section 8.4.

          Section 1.47 "Products" means Carbon Monoxide, Blend Gas,Hydrogen and
Steam, individually and collectively.

          Section 1.48 "Proprietary Rights" shall have the meaning ascribed to
it in Section 14.6.

          Section 1.49 "Second Additional Term" has the meaning ascribed to it
in Section 21.2.

          Section 1.50 "Seller's Facility" means the facilities to be
constructed, owned and operated by Seller for the production and delivery of
Products for sale and delivery to Buyer pursuant to this 
<PAGE>
 
Agreement and for the sale of Hydrogen to third parties. The location of
Seller's Facility is depicted on Exhibit B.

          Section 1.51 "Startup" means the date by which Seller initially has
produced Carbon Monoxide, Blend Gas, Hydrogen and Steam at Buyer's Required
Rates up to the Contract Volume of Products for a continuous period of 48 hours.

          Section 1.52 "Steam" means steam produced by Seller's Facility
conforming to the specifications set forth in Exhibit C.

          Section 1.53 "Steam Contract Volume" means the volume of steam
produced by Seller's Facility.

          Section 1.54 "Steam Delivery Point" means the flange where Buyer's
Pipelines will be connected to Seller's Facility at the Steam custody transfer
point depicted in Exhibit B.

          Section 1.55 "Steam Fee" means the fee payable by Buyer to Seller for
Steam sold hereunder as provided in Section 8.3.

          Section 1.56 "Steam Totalizer" means Seller's metering equipment to be
installed and maintained by Seller at Seller's Facility to measure the
quantities of Steam delivered to Buyer hereunder.

          Section 1.57 "Supplemental Hydrogen" means (i) all Hydrogen delivered
to Buyer hereunder at the Hydrogen Delivery Point from a source other than
Seller's Facility when Seller's Facility is not producing Hydrogen, and (ii)
when Seller's Facility is producing Hydrogen and Buyer's Hydrogen Requirements
exceed the Hydrogen Contract Volume, the volume of Hydrogen delivered to Buyer
at the Hydrogen Delivery Point in excess of the Hydrogen Contract Volume.

          Section 1.58 "Term" has the meaning ascribed to it in Section 21.2.

          Section 1.59 "Texaco Information" has the meaning ascribed to it in
Section 19.4.

          Section 1.60 "Utilities Agreement" means that certain Utilities
Agreement of even date herewith between Seller and Buyer pursuant to which Buyer
will provide certain utilities to Seller for use at Seller's Facility, as same
may be amended from time to time in accordance with the provisions thereof.

ARTICLE 2  - STARTUP

          Section 2.1 Startup. Seller shall use its best efforts to achieve
Startup by February 1, 1996. Seller shall give Buyer not less than two days'
notice prior to each attempt to achieve Startup and Buyer shall be entitled to
have its representatives present at Seller's Facility to observe each such
attempt and to verify that Startup has occurred. Subject to the limitations
contained in Section 19.4, Seller shall provide all data reasonably requested by
Buyer to help Buyer verify Startup.

          Section 2.2 Seller's Penalty for Late Startup. Subject to Section 2.3,
Seller will pay to Buyer penalty payments in lump sums of (***) each if Startup
is not achieved by the following penalty dates: June 1, 1996, July 1, 1996,
August 1, 1996,
<PAGE>
 
September 1, 1996 and October 1, 1996. If Startup is not achieved by October 1,
1996, Buyer may elect to initiate the dispute resolution procedures contained in
Article 18 hereof.

          Section 2.3 Exceptions to Seller's Penalty for Delay. To the extent
that delay in Startup is caused by Buyer or by a Force Majeure Event, each
penalty date specified in Section 2.2 will be extended by the period of such
delay. Seller shall notify Buyer as soon as possible after the occurrence of any
act or omission by Buyer, or the occurrence of any Force Majeure Event, that
will cause a delay in Startup and the expected length of such delay.

          Section 2.4 Buyer's Penalty for Late Startup. Subject to Section 2.5,
Buyer will pay to Seller penalty payments in lump sums of (***) each if Startup
is not achieved by the following penalty dates because Buyer has requested
Seller to delay Startup after Seller's Facility is mechanically complete and
technically capable of achieving Startup: June 1, 1996, July 1, 1996, August 1,
1996, September 1, 1996 and October 1, 1996. If Seller's Facility is
mechanically complete and technically capable of achieving Startup, and Startup
is not achieved by November 1, 1996 because Buyer has requested Seller to delay
Startup, Buyer shall pay the Fixed Facility Fee and (***) of the Adjustable
Facility Fee until Startup occurs.

          Section 2.5 Exceptions to Buyer's Penalty for Late Startup. To the
extent that Buyer's request that Seller delay Startup is caused by Seller or by
a Force Majeure Event, each penalty date specified in Section 2.4 will be
extended by the period of such delay. Buyer shall notify Seller as soon as
possible after the occurrence of any act or omission by Seller, or the
occurrence of any Force Majeure Event, that will cause Buyer to request a delay
in Startup and the expected length of such delay.

          Section 2.6 Obligation to Deliver after Startup. Except as otherwise
provided in this Agreement, after Startup Seller agrees to deliver the Products
to Buyer at Buyer's Required Rates during the Term, and Buyer agrees to pay for
Products delivered in accordance with the terms of this Agreement.

          Section 2.7 Covenant Regarding Delay. Seller covenants that it will
not delay Startup for any reason (including, without limitation, the absence of
contracts with third parties for the sale of hydrogen produced at Seller's
Facility) once Seller's Facility is mechanically complete and it is technically
feasible to achieve Startup.

ARTICLE 3  - DELIVERY OF CARBON MONOXIDE

          Section 3.1 Obligation to Deliver Carbon Monoxide. After Startup
Seller shall sell and deliver to Buyer and Buyer shall purchase and receive from
Seller, on the terms and conditions set forth herein, Buyer's Carbon Monoxide
Requirements.

          Section 3.2 Carbon Monoxide Pressure. Carbon Monoxide will be
delivered to the Carbon Monoxide Delivery Point at a pressure of
<PAGE>
 
not less than (***), or greater than (***), per square inch gauge pressure.
Buyer shall be responsible for installing and maintaining appropriate relief
devices on Buyer's Pipelines with respect to Buyer's receipt of Carbon Monoxide.

          Section 3.3 Title to and Risk of Loss of Carbon Monoxide. Title to and
risk of loss of Carbon Monoxide shall pass to Buyer at the Carbon Monoxide
Delivery Point.

          Section 3.4 Carbon Monoxide Volume. Seller will deliver Carbon
Monoxide to the Carbon Monoxide Delivery Point under as uniform conditions and
rates as possible and in a manner commensurate with good operating practices.
However, Seller will vary the volume of Carbon Monoxide delivered hereunder as
may be necessary to accommodate savings that may occur in the production of
acetic acid by Buyer's Plant of approximately (***). Seller represents and
warrants to Buyer that Seller's Facility has been designed to operate, and
following Startup can and will be operated, to deliver the Carbon Monoxide
Contract Volume in accordance with the terms of this Agreement.

ARTICLE 4  - DELIVERY OF BLEND GAS

          Section 4.1 Obligation to Deliver Blend Gas. After Startup Seller
shall sell and deliver to Buyer and Buyer shall purchase and receive from
Seller, on the terms and conditions set forth herein, Buyer's Blend Gas
Requirements.

          Section 4.2 Blend Gas Pressure. Blend Gas will be delivered to the
Blend Gas Delivery Point at a pressure of not less than (***), or greater than
(***), per square inch gauge pressure. Buyer shall be responsible for installing
and maintaining appropriate relief devices on Buyer's Pipelines with respect to
Buyer's receipt of Blend Gas.

          Section 4.3 Title to and Risk of Loss of Blend Gas. Title to and risk
of loss of Blend Gas shall pass to Buyer at the Blend Gas Delivery Point.
 
          Section 4.4 Blend Gas Volume. Seller will deliver Blend Gas to the
Blend Gas Delivery Point under as uniform conditions and rates as possible and
in a manner commensurate with good operating practices. However, Seller will
vary the volume of Blend Gas delivered hereunder from (***) of the Blend Gas
Contract Volume, as may be necessary to accommodate the operation of Buyer's
Plant. In addition, in order to accommodate the operation of Buyer's Plant,
Seller will vary the volume of Blend Gas delivered hereunder by as much as (***)
above or below the volume produced at Seller's Facility during steady state
operation in the ordinary course of the operation of Seller's Facility. Seller
represents and warrants to Buyer that Seller's Facility has been designed to
operate, and after Startup can and will be operated, to deliver the Blend Gas
Contract Volume in accordance with the terms of this Agreement.
<PAGE>
 
ARTICLE 5  - DELIVERY OF HYDROGEN AND SUPPLEMENTAL HYDROGEN

          Section 5.1 Obligation to Deliver Hydrogen. After Startup Seller shall
sell and deliver to Buyer and Buyer shall purchase and receive from Seller, on
the terms and conditions set forth herein, Buyer's Hydrogen Requirements.

          Section 5.2 Delivery of Supplemental Hydrogen. After Startup Seller
will, from time to time at the request of Buyer, sell and deliver Supplemental
Hydrogen to Buyer, subject to Seller's prior commitments for the sale of
hydrogen to third parties. Buyer will purchase any Supplemental Hydrogen
received from Seller on the terms and conditions set forth herein.

          Section 5.3 Hydrogen Pressure. Hydrogen and Supplemental Hydrogen will
be delivered to the Hydrogen Delivery Point at a pressure of not less than
(***), or greater than (***), per square inch gauge pressure. Buyer shall be
responsible for installing and maintaining appropriate relief devices on Buyer's
Pipelines with respect to Buyer's receipt of Hydrogen produced by Seller's
Facility and Supplemental Hydrogen.

          Section 5.4 Title to and Risk of Loss. Title to and risk of loss of
Hydrogen (and Supplemental Hydrogen) shall pass to Buyer at the Hydrogen
Delivery Point.

          Section 5.5 Hydrogen Volume. Seller will deliver Hydrogen (and, if any
Supplemental Hydrogen is sold and purchased hereunder, such Supplemental
Hydrogen) to the Hydrogen Delivery Point under as uniform conditions and rates
as possible and in a manner commensurate with good operating practices. However,
Seller agrees that it will vary the volume of Hydrogen delivered hereunder from
(***) of the Hydrogen Contract Volume, as may be necessary to accommodate the
operation of Buyer's Plant. In addition, in order to accommodate the operation
of Buyer's Plant, Seller will vary the volume of Hydrogen delivered hereunder by
as much as (***) above or below the steady state operation of Seller's Facility
during steady state operation in the ordinary course of the operation of
Seller's Facility. Seller represents and warrants to Buyer that Seller's
Facility has been designed to operate, and after Startup can and will be
operated, to deliver the Hydrogen Contract Volume in accordance with the terms
of this Agreement.

ARTICLE 6  - DELIVERY OF STEAM

          Section 6.1 Steam Delivery Obligation. After Startup, Seller shall
deliver and Buyer shall accept the Steam Contract Volume at the Steam Delivery
Point at a pressure of not less than (***) pounds per square inch gauge
pressure, and at a temperature of (***) degrees Fahrenheit, and meeting the
specifications set forth in Exhibit C; provided, however, that the boiler
feedwater supplied by Buyer to Seller pursuant to the Utilities Agreement meets
the expected specifications set forth therein. The expected quantity of Steam
(in pounds per hour) that Seller's
<PAGE>
 
Facility will produce at various operating rates (expressed as a percentage of
the Carbon Monoxide Contract Volume) is set forth on Attachment 1 to Exhibit C;
provided, however, Buyer shall be obligated to take all Steam produced by
Seller's Facility in quantities up to (***) of the quantities shown on
Attachment 1 to Exhibit C, but shall not be obligated to pay for Steam delivered
in quantities in excess of (***) of the quantities shown on Attachment 1 to
Exhibit C. Buyer shall be responsible for installing and maintaining appropriate
relief devices on Buyer's Pipelines with respect to Buyer's receipt of Steam.

          Section 6.2 Title to and Risk of Loss of Steam. Title to and risk of
loss of Steam shall pass to Buyer at the Steam Delivery Point.

ARTICLE 7 - SHUTDOWNS, FAILURES TO DELIVER AND FAILURES TO TAKE

          Section 7.1 Seller's Maximum Shutdown Period. After Startup, Seller
will have the right from time to time, upon 14 days (or such shorter period as
circumstances reasonably dictate) prior notice to Buyer, to shut down Seller's
Facility for up to a maximum of (***) hours during any Contract Year (the
"Maximum Shutdown Period") for the purpose of making ordinary repairs for
maintenance and/or thawing necessary and consistent with proper operation. For
purposes of calculating the Maximum Shutdown Period, any hour during which
Seller does not deliver the Products (or any one of them) at (***) of Buyer's
Required Rates shall be treated as an hour during which Seller has shut down
Seller's Facility even if no prior notice thereof was given by Seller to Buyer.
However, a shutdown of Seller's Facility (i) as a result of a Force Majeure
Event, or (ii) at a time when each of Buyer's Blend Gas Requirements, Hydrogen
Requirements and Carbon Monoxide Requirements is zero, shall not be included in
calculating the Maximum Shutdown Period.

           Section 7.2 Seller's Failure to Deliver; No Force Majeure.

           (a) If subsequent to Startup Seller delivers Products, but such
deliveries are at rates below Buyer's Required Rates for a period of time in
excess of the Maximum Shutdown Period for any reason other than a Force Majeure
Event (the "Excess Shutdown Period"), for the Excess Shutdown Period Buyer shall
pay a prorated Fixed Facility Fee and a prorated Adjustable Facility Fee based
upon the portion that the amount of Products actually delivered bears to Buyer's
Required Rates therefor. If Seller shall fail to deliver any Product during any
Contract Year for any Excess Shutdown Period, Buyer shall have no obligation to
pay any part of the Fixed Facility Fee or the Adjustable Facility Fee for the
Excess Shutdown Period.

           (b) In the event that Buyer's Required Rates for any Product equal
the Contract Volume of Products and Seller shall be unable to supply the
Contract Volume of Products thereof after the expiration of the Maximum Shutdown
Period for any Contract Year for
<PAGE>
 
any reason other than a Force Majeure Event, Seller shall give Buyer prompt
notice of Seller's inability to deliver the full Contract Volume of Products. In
such event, the authorized representatives of each of the parties shall be
obligated to meet within 24 hours after receipt by Buyer of such notice from
Seller. Seller shall be obligated to present, at such meeting, a plan to remedy
its failure to deliver. Additionally, Seller shall be obligated to restore
delivery of such Product to Buyer's Required Rates therefor within a reasonable
period of time, taking into account the scope of the technical requirements and
the correction period associated with the modifications required to so restore
delivery. Seller shall be obligated to use all reasonable commercial efforts to
achieve such result. In the event that delivery of Products is not restored to
Buyer's Required Rates within a reasonable period of time, Seller shall use its
best efforts to provide Products from a facility other than Seller's Facility to
satisfy Buyer's Required Rates up to the Contract Volume of Products, and Seller
shall provide such Products at the same cost to Buyer as it would have provided
Products from Seller's Facility; provided, however, that to the extent that the
cost of providing Products from another facility exceeds two times the amount
that Buyer would have paid for Products from Seller's Facility, Seller shall not
be obligated to pay (or bear the cost of) the amount of such excess. If,
however, Buyer shall agree to pay (or bear the cost of) the amount in excess of
two times the cost of providing Products from another facility, Seller shall be
obligated to continue to provide Products from such other location.

           (c) In the event that Seller is unable to supply a Product at Buyer's
Required Rates therefor for any reason other than a Force Majeure Event, Buyer
may elect to purchase such Product from another supplier to the extent Seller is
unable to supply such Product up to Buyer's Required Rates therefor. In such
event, Seller will pay Buyer for the difference between the amount that Buyer
would have paid for Products delivered from Seller's Facility and the amount
actually paid for such Products by Buyer, up to two times the amount that Buyer
would have paid for Products delivered from Seller's Facility.

           (d) Notwithstanding the other provisions of this Agreement, in the
event that Seller is unable to supply Products at Buyer's Required Rates on a
sustained basis for any reason other than a Force Majeure Event, and such
inability continues for a period of (***) consecutive days, Buyer may elect to
initiate the dispute resolution procedures contained in Article 18 hereof.

           Section 7.3 Buyer's Failure to Take; No Force Majeure.

           (a) Seller's Facility will be operated and maintained to accommodate
planned shutdowns of the acetic acid unit at Buyer's Plant. To the extent
practicable, Buyer and Seller will cooperate in scheduling planned shutdowns of
their respective plants.
<PAGE>
 
           (b) Following Startup, Buyer shall be entitled to a grace period of
eight days (plus such number of additional days during which Buyer and Seller
have jointly scheduled planned shutdowns) during any Contract Year ("Buyer's
Annual Grace Period") for planned shutdowns of its acetic acid unit. During
Buyer's Annual Grace Period, Buyer shall not be obligated to take Products from
Seller and Buyer shall be obligated to pay Seller only the Fixed Facility Fee.

           (c) If after Buyer's Annual Grace Period during any Contract Year,
Buyer is unable to take at least (***) of the Carbon Monoxide Contract Volume
for any reason other than a Force Majeure Event of Buyer at a time when Seller
is able to provide at least (***) of the Carbon Monoxide Contract Volume, Buyer
shall pay the full amount of the Fixed Facility Fee and (***) of the Adjustable
Facility Fee. In such event, Buyer shall receive a credit equal to the
difference between the Adjustable Facility Fee paid and the cost of the Carbon
Monoxide actually taken; provided, however, that such credit will only be
applied to Carbon Monoxide taken in excess of the Carbon Monoxide Contract
Volume during the twelve-month period immediately following the period of
reduced purchase of Carbon Monoxide by Buyer.

           (d) If Buyer's acetic acid unit is shut down but other operations at
Buyer's Plant require Blend Gas and Hydrogen, Seller will use reasonable efforts
to operate Seller's Facility as efficiently as possible at reduced production
rates to enable Seller's Facility to meet such requirements. Buyer acknowledges
that operating Seller's Facility in order to deliver Products at Buyer's
Required Rates that are less than (***) of the Carbon Monoxide Contract Volume
will be inefficient and Buyer agrees that if Seller so operates Seller's
Facility at Buyer's request, Seller and Buyer shall agree on an appropriate
adjustment to the Feed/Fuel Fee payable by Buyer hereunder for any Month in
which Seller's Facility is so operated to compensate Seller for such
inefficiency; provided, that Seller shall not be required to operate Seller's
Facility at rates below (***) of the Carbon Monoxide Contract Volume if
operating at such rates will result in a violation by Seller of its air
emissions permit with respect to Seller's Facility.

           Section 7.4 Seller's Failure to Deliver; Seller's Force Majeure. (a)
If at any time after Startup Seller experiences a Force Majeure Event which
causes a total shutdown of Seller's Facility for a period of time in excess of
the Maximum Shutdown Period, Buyer shall pay (***) of the Fixed Facility Fee and
(***) of the Adjustable Facility Fee for such period, but not to exceed a total
of (***) days during the Initial Term, or a total of (***) days during each of
the First Additional Term and the Second Additional Term. To the extent that
prior to such Seller's Force Majeure Event, Buyer has purchased Carbon Monoxide
in excess of (***) of the Carbon Monoxide Contract Volume during the preceding
twelve months, Buyer may apply all amounts it paid in excess of (***) as a
credit against the Adjustable Facility Fee, thus reducing the payments required
from Buyer during Seller's Force Majeure Event. Buyer may
<PAGE>
 
also apply such credit to payments for Carbon Monoxide after the termination of
a Seller's Force Majeure Event until such credit has been fully utilized.

           (b) In the event of partial deliveries by Seller during a period in
which Seller's Force Majeure Event has occurred and is continuing, the period of
the Force Majeure Event shall be prorated in calculating the number of days of
Seller's Force Majeure Event and the amount of credit that Buyer may apply in
the manner set forth in Section 7.4(a) shall also be prorated.

           (c) If the time Seller's Facility is shut down for Seller's Force
Majeure Events exceeds (***) days during the Initial Term ((***) days in the
case of each of the First Additional Term and the Second Additional Term), but
is less than (***) days ((***) days in the case of each of the First Additional
Term and the Second Additional Term), Buyer shall pay (***) of the Fixed
Facility Fee and (***) of the Adjustable Facility Fee for such period; provided,
however, that Buyer's obligation to pay (***) each of the Fixed Facility Fee and
the Adjustable Facility Fee shall be reduced by purchases of Carbon Monoxide in
excess of (***) of the Carbon Monoxide Contract Volume during the twelve months
preceding each Seller's Force Majeure Event and at any time during the remainder
of the Term, in order to reduce the amount that Buyer will have paid during a
Seller's Force Majeure Event to zero.

           (d) If a Seller's Force Majeure Event causes a total shutdown of
Seller's Facility for a period in excess of (***) consecutive days, Seller will
use its best efforts to supply Products (other than Steam) to Buyer from a
source other than Seller's Facility; provided, however, that if the cost to
Seller of supplying such Products is greater than the price Buyer would have
paid for such Products had they been produced in Seller's Facility, Seller shall
only be required to pay the difference between the cost to Buyer of Products
supplied from Seller's Facility and Products supplied from elsewhere up to a
limit of (***) times the purchase price Buyer would have paid for the Products
as specified in Section 8.1.

           If a Seller's Force Majeure Event causes a total shutdown of Seller's
Facility for a period in excess of (***) consecutive days, it is acknowledged
that Buyer may purchase Products (other than Steam) from third parties in order
to operate the oxoalcohol, acetic acid and other units at Buyer's Plant. If
Buyer so purchases any of such Products from a third party, Seller will
reimburse Buyer for the amount paid by Buyer in excess of the price that would
have been charged to Buyer for such Products supplied from Seller's Facility not
to exceed (***) the purchase price Buyer would have paid for such Products
hereof as specified in Section 8.1. Nothing herein shall be construed to
prohibit or restrict Buyer, in the event that Seller is unable to supply
Products at any time for any reason, from obtaining Products from
<PAGE>
 
third parties to replace Products that Seller has failed or is unable to deliver
hereunder.

           Section 7.5 Buyer's Failure to Take; Buyer's Force Majeure. If after
the expiration of Buyer's Annual Grace Period during any Contract Year as
specified in Section 7.3(b), Buyer does not purchase at least (***) of the
Carbon Monoxide Contract Volume as a result of a Force Majeure Event, Buyer
shall be obligated to pay the Fixed Facility Fee and (***) of the Adjustable
Facility Fee until such time as Buyer resumes purchasing at least (***) of the
Carbon Monoxide Contract Volume; provided, however, that such amounts shall be
credited to the account of Buyer and Buyer may apply such credit as payment for
purchases of Carbon Monoxide from Seller after July 31, 2016. In order to
utilize such credit against purchases of Products after July 31, 2016, Buyer
shall have the right to extend this Agreement on its then existing terms and
conditions for the amount of time necessary to fully utilize its credit, not to
exceed (***). If Buyer has credit remaining after the end of such twelve-month
extension, Seller must elect to either agree with Buyer to further extend the
Agreement to allow Buyer to fully utilize its credit, or to purchase the
remaining credit from Buyer. In the event Buyer discontinues its supply of any
utility to Seller as provided in Section 12.6 of the Utilities Agreement, the
Adjustable Facility Fee and the Feed/Fuel Fee shall be increased to offset any
costs Seller may incur as a result of such discontinuance, and in the event such
discontinuance causes any interruption in the operation of Seller's Facility,
such interruption shall be deemed to be a Force Majeure Event of Buyer.

           Section 7.6 Mandatory Shut Down. In addition to the other provisions
on shutdowns contained in this Agreement, Seller agrees to shut down Seller's
Facility at any time that Buyer shuts down its acetic acid unit; provided,
however, that if Seller's Facility does not require any maintenance at the time
of such shutdown, Buyer will pay the Fixed Facility Fee and (***) of the
Adjustable Facility Fee during such shutdown, unless and to the extent that the
period of such shutdown is included in Buyer's Annual Grace Period.

ARTICLE 8 - PRICING AND PAYMENT

           Section 8.1 Purchase Price for Products. The purchase price for all
Products purchased hereunder shall be the sum of the following:
                  (a)  the Fixed Facility Fee;
                  (b)  the Adjustable Facility Fee;
                  (c)  the Feed/Fuel Fee;
                  (d)  the Steam Fee;
                  (e)  any charges for Supplemental Hydrogen as provided in
           Section 8.4; and
                  (f)  the amount of any applicable sales, use or other taxes.
<PAGE>
 
           Section 8.2 Fixed Facility Fee. In accordance with the procedures
established in Section 8.6, Buyer shall pay to Seller for each Month during the
Term, beginning with the Month in which the Startup occurs, a Fixed Facility Fee
in the amount of (***). The Fixed Facility Fee for the Month in which Startup
occurs shall be prorated in the event Startup occurs on a date other than the
first day of such Month. Except as otherwise provided in Article 7, Buyer shall
be obligated to pay the Fixed Facility Fee to Seller even if Buyer has no
requirements for Carbon Monoxide, Blend Gas or Hydrogen.

           Section 8.3 Adjustable Facility Fee; Feed/Fuel and Steam Fees. As
promptly as possible after the end of each Month, Seller will read the Carbon
Monoxide Totalizer, the Blend Gas Totalizer, the Hydrogen Totalizer and the
Steam Totalizer to determine the volumes of Carbon Monoxide, Blend Gas, Hydrogen
and Steam delivered to Buyer from Seller's Facility during such Month. Based
upon such readings, Seller will invoice Buyer for and Buyer will pay to Seller
in accordance with the procedure established in Section 8.6 the following fees:
(i) the Adjustable Facility Fee, the Feed/Fuel Fee and the Steam Fee, calculated
in the manner prescribed in Exhibit A attached hereto and made a part hereof, in
each case as adjusted as provided in Exhibit A, and (ii) the amount of any
applicable sales, use or other excise taxes. In the event that the readings for
any Month show that the volume of Carbon Monoxide delivered to Buyer from
Seller's Facility during such Month is less than or is in excess of the Carbon
Monoxide Contract Volume, the Adjustable Facility Fee and the Feed/Fuel Fee
shall be adjusted as provided in Exhibit A.

           Section 8.4 Supplemental Hydrogen. In the event Seller delivers
volumes of Supplemental Hydrogen to Buyer, Buyer shall pay Seller for such
volumes of Supplemental Hydrogen in accordance with the following formula:

(***)
                  where:
(***).

           Section 8.5 Payment for Supplemental Hydrogen. As promptly as
possible after the end of each Month Seller will read the Hydrogen Totalizer to
determine the volume of Supplemental Hydrogen delivered to Buyer during such
Month. Based upon such readings, Seller will invoice Buyer and Buyer will pay
Seller for such volume a charge as provided in Section 8.6.

           Section 8.6 Terms of Payment. (a) Terms of payment will be (***)
following Buyer's receipt of invoice. In the event Buyer is late in the making
of any payment hereunder, Buyer shall pay to Seller a late payment charge
against the unpaid portion of the invoiced amount equal to the lesser of (i) a
rate of (***) per annum or (ii) the maximum rate permitted by law of the unpaid
balance for each Month or partial Month that said invoice remains unpaid after
the
<PAGE>
 
above-mentioned due date. Such interest shall be in addition to any other
rights of Seller arising as a result of Buyer's failure to make such payment or
part thereof within the time specified. Any and all payments to Seller hereunder
shall be made by Buyer to a location and/or account designated in writing by
Seller sufficiently in advance of the payment date to permit such payment, and
Buyer shall acknowledge such notice in writing.

           (b) If Buyer has reason to dispute the accuracy of any invoice
submitted to it by Seller, Buyer will pay the part of the invoice that is not
disputed in accordance with the provisions of this Article 8 and, after such
dispute has been resolved, Buyer will pay the balance due to Seller, or Seller
will refund any amount due to Buyer, within (***) of the receipt of a
replacement invoice.

           (c) Seller shall maintain business and accounting records and
production data in accordance with usual and customary practices and standards
in the chemical industry in respect of all matters referred to in this
Agreement. Subject to the limitations contained in Section 19.4, Seller shall
provide Buyer access to such records and data pursuant to the provisions of
Section 19.1 and 22.2 hereof.

           (d) In the event that any invoice submitted by Seller to Buyer shall
contain terms and conditions that are inconsistent with this Agreement, the
terms of this Agreement shall control.

ARTICLE 9 - TAXES

           If at any time during the Term, any governmental authority imposes a
tax (excluding federal income tax and state franchise tax) which increases
Seller's costs incurred in the production, sale or delivery of any Product to
Buyer hereunder, or if, due to a rate change, or other action of a governmental
authority, there is at any time during the term of this Agreement an increase in
any such tax presently existing, then Buyer and Seller will agree on an
appropriate adjustment to the Adjustable Facility Fee to keep Seller whole.

ARTICLE 10 - FORCE MAJEURE

           Section 10.1 Force Majeure Events. (a) In the event either party is
rendered unable, wholly or in part, by a Force Majeure Event to perform its
obligations under this Agreement (other than an obligation to pay monies when
due), it is agreed that on such party promptly giving notice and reasonably full
particulars of such Force Majeure Event in writing in accordance with Section
10.3 to the other party, then the obligations of the party giving such notice,
so far as they are affected by such Force Majeure Event, shall be suspended
during the continuance of any inability so caused, but for no longer period, and
such cause shall so far as possible be remedied with all reasonable dispatch.

           (b) The term "Force Majeure Event," as used in this Agreement, shall
mean any act of God, strikes, lockouts or other
<PAGE>
 
industrial disturbances, acts of the public enemy, wars, blockades, embargoes,
insurrections, riots, epidemics, landslides, lightning, earthquakes, fires,
storms, floods, high water, washouts, arrests and restraints of government and
people, civil disturbances, explosions, breakage or accident to machinery,
equipment, lines of pipe or property, freezing of wells, machines, equipment,
lines of pipe, or property, partial or entire extraordinary failure of any
machine, equipment, lines of pipe or other property, the occurrence of any
emission, discharge, release or threatened release of Hazardous Substances (as
that term is defined in the Ground Lease), the inability of Seller's Facility to
deliver Products (or any one of them) at 100% of Buyer's Required Rates because
of any remediation required to be done in, on, about or under the Facility Site
as provided in Section 5.8 of the Ground Lease (which inability shall be deemed
to be a Force Majeure Event of Buyer), and any other causes, whether of the kind
herein enumerated or otherwise, not reasonably within the control of the party
claiming suspension.

           (c) Notwithstanding the provisions of this Section 10.1 the failure
by either party to perform any of its obligations under this Agreement shall be
deemed not to have been caused by circumstances reasonably outside its control
if such failure results from breakage or accident to machinery, equipment, lines
of pipe or other property or the partial or entire extraordinary failure thereof
or the necessity to make repairs or alterations thereto which result from (i)
normal wear and tear which would be reasonably anticipated by a reasonably
prudent operator or in circumstances where a reasonably prudent operator would
have standby equipment or spare parts or (ii) the lack of the proper operation,
maintenance, quality control, design,engineering and/or procurement of such
machinery, equipment, lines of pipe or other property.

           Section 10.2 Settlement of Strikes. It is understood and agreed that
the settlement of strikes or lockouts shall be entirely within the discretion of
the party having the difficulty, and that the above requirement that any Force
Majeure Event shall be remedied with all reasonable dispatch shall not require
the settlement of strikes or lockouts by acceding to the demands of the opposing
party when such course is inadvisable in the discretion of the party having the
difficulty.

           Section 10.3 Notice of Force Majeure. As soon as practicable after
occurrence of any Force Majeure Event, the party claiming force majeure shall
notify the other party in writing of the occurrence and nature of such Force
Majeure Event describing it in reasonable detail and, to the extent possible,
inform the other party of the suspected cause and the expected duration of the
Force Majeure Event and the performance to be affected by the suspension or
curtailment under this Agreement. After the termination of any Force Majeure
Event, as soon as practicable, the party claiming force majeure shall notify the
other party in writing
<PAGE>
 
of the termination of such Force Majeure Event and its actual cause and
duration.

ARTICLE 11 - LIMITATION OF LIABILITY

           Section 11.1 Acknowledgement of Hazards. Each party acknowledges that
there are hazards associated with the storage, use and handling of Carbon
Monoxide, Blend Gas, Hydrogen and Steam and each party agrees that its personnel
concerned therewith are aware of such hazards. Each party shall be responsible
for complying with all relevant reporting obligations under all laws applicable
thereto as the result of the presence at Buyer's Plant or at Seller's Facility,
as the case may be, of Carbon Monoxide, Blend Gas, Hydrogen and Steam supplied
under this Agreement, including but not limited to the Emergency Planning and
Community Right-to-Know Act of 1986, 42 U.S.C. Sections 11001-11049 ("EPCRA,"
also commonly known as Title III of the Superfund Amendments and Reauthorization
Act of 1986, SARA Title III), as same may be amended. Each party to this
Agreement shall be responsible for warning and protecting its respective
employees, independent contractors and others exposed to the hazards posed by
such party's storage, use and handling of Carbon Monoxide, Blend Gas, Hydrogen
and Steam. As between Buyer and Seller, Buyer assumes all responsibility for the
suitability and the results of using Carbon Monoxide, Blend Gas, Hydrogen and
Steam delivered to Buyer hereunder alone or in combination with other articles
or substances and in any manufacturing or other process or procedures.

           Section 11.2 No Consequential Damages. Neither party to this
Agreement shall be liable to the other party to this Agreement for any
incidental, consequential, indirect, or special damages. Seller will provide to
Buyer copies of Seller's documents containing Seller's safety and health
information pertaining to Carbon Monoxide, Blend Gas, Hydrogen and Steam
delivered hereunder including, without limitation, Seller's Material Safety Data
Sheet(s), and Buyer will incorporate such information into Buyer's safety
program.

ARTICLE 12 - SELLER'S PRODUCT WARRANTIES; DISCLAIMERS

           Seller represents and warrants to, and covenants and agrees with,
Buyer that the Carbon Monoxide, Blend Gas, Hydrogen and Steam delivered
hereunder shall conform to the specifications set forth in Exhibit C. Any Carbon
Monoxide, Blend Gas, Hydrogen or Steam which does not conform to the foregoing
specifications may be rejected by Buyer by providing verbal notice to Seller's
Facility within two (2) hours and subsequent written confirmation within five
(5) days thereafter, no charge will be made for any Carbon Monoxide, Blend Gas,
Hydrogen or Steam so rejected and Buyer shall have no obligation to return any
Product which does not conform to specifications. Seller shall have the right to
confirm Buyer's data supporting such rejection. Since Seller will furnish Buyer
with
<PAGE>
 
an analytical/isolation system that will be installed on Buyer's Pipelines,
and will have the capability of testing whether Carbon Monoxide, Blend Gas or
Hydrogen delivered hereunder meets the specifications set forth in Exhibit C,
and which will be maintained, operated and monitored by Buyer, and Buyer may
obtain other devices that have the capability of testing whether Carbon
Monoxide, Blend Gas or Hydrogen delivered hereunder meets the specifications set
forth on Exhibit C, no claim of any kind with respect to the conformance of
Carbon Monoxide, Blend Gas, Hydrogen or Steam to such specifications, whether or
not based on contract, warranty, negligence, indemnity, strict liability or
otherwise, shall be greater than the price of the quantity of the nonconforming
Product; provided, however, in the event (i) of Seller's negligence or willful
misconduct or (ii) the analytical/isolation systems at Seller's Facility related
to the delivery of Blend Gas, Carbon Monoxide or Hydrogen are damaged or
disabled by any intentional act of Seller, and such negligence, willful
misconduct or intentional act results in the delivery hereunder of Blend Gas,
Carbon Monoxide or Hydrogen that fails to meet such specifications and damages
any catalyst within Buyer's Plant, Seller shall be responsible to Buyer for any
direct damages caused to any catalyst within Buyer's Plant, including any costs
and expenses incurred by Buyer to repair or replace the damaged catalyst, to the
extent such negligence, willful misconduct or intentional act of Seller causes
such damages up to a maximum of (***) for each such claim; and provided further,
that said (***) limitation shall be adjusted semi-annually during the Term
effective as of January 1 and July 1 of each year to reflect changes in the
average Monthly Producer Price Index - Industrial Commodities (where the base is
1982=100) published by the United States Department of Labor, Bureau of Labor
Statistics, in accordance with the following formula:

(***)

           Where:

(***)

If the Producer Price Index-Industrial Commodities index is revised and
published on some base other than 1982=100, the value thereof used in the
formula in this Article 12 will be adjusted to the new base in accordance with
such conversion schedule or factor as may be supplied by the publisher of the
index. Should the Producer Price Index-Industrial Commodities index cease to
exist, Seller and Buyer shall jointly select a new index which is based on
similar information. The foregoing shall constitute Buyer's exclusive remedy,
and Seller's sole obligation, hereunder with respect to each such claim. THERE
ARE NO EXPRESS WARRANTIES BY SELLER REGARDING THE CONFORMITY OF THE PRODUCTS TO
THE SPECIFICATIONS
<PAGE>
 
OTHER THAN THOSE SPECIFIED IN THIS ARTICLE 12. NO WARRANTIES BY SELLER (OTHER
THAN WARRANTIES OF TITLE AND AGAINST INFRINGEMENT AS PROVIDED IN THE UNIFORM
COMMERCIAL CODE) SHALL BE IMPLIED OR OTHERWISE CREATED UNDER THE UNIFORM
COMMERCIAL CODE WITH RESPECT TO SUCH PRODUCTS, INCLUDING BUT NOT LIMITED TO THE
WARRANTY OF MERCHANTABILITY AND THE WARRANTY OF FITNESS FOR A PARTICULAR
PURPOSE.

ARTICLE 13 - REPRESENTATIONS AND WARRANTIES OF BUYER

Buyer represents and warrants to Seller as follows:

           Section 13.1 Organization, Good Standing and Corporate Power. Buyer
is a corporation duly organized, validly existing and in good standing under the
laws of the State of Delaware, is duly qualified as a foreign corporation in the
State of Texas, and has all requisite corporate power and authority to carry on
its business as presently conducted, to enter into this Agreement and perform
its obligations hereunder.

           Section 13.2 Authority Relative to Agreement. The execution, delivery
and performance by Buyer of this Agreement have been duly and effectively
authorized by all necessary corporate action.

           This Agreement has been duly executed and delivered by Buyer and is a
legal, valid and binding obligation of Buyer enforceable in accordance with its
terms, except insofar as enforcement may be limited by (i) bankruptcy,
insolvency, reorganization or similar laws relating to or affecting the
enforcement of creditors' rights generally, and (ii) general principles of
equity.

           Section 13.3 No Conflict with Other Instruments or Proceedings.
Neither the execution and delivery of this Agreement, nor the performance or
compliance with the terms and conditions hereof conflict with, or will result in
a breach by Buyer of, or constitute a default under, or result in the creation
of any lien, charge or encumbrance upon, any asset of Buyer pursuant to any of
the terms, conditions or provisions of (i) the Certificate of Incorporation or
Bylaws of Buyer, (ii) any material mortgage, deed of trust, lease, contract,
agreement or other instrument to which Buyer is a party or by which Buyer may be
bound or affected, or (iii) any writ, order, judgment, decree, statute,
ordinance, regulation or any other restriction of any kind or character, to
which Buyer is subject, or by which Buyer may be bound or affected.

           Section 13.4 No Litigation or Proceedings. As of the date hereof,
there are no actions, suits, investigations or proceedings pending or, to
Buyer's knowledge, threatened against Buyer at law or in equity or before or by
any federal, state, municipal or other governmental or non-governmental
department, commission, board, bureau, agency or instrumentality seeking to
enjoin, restrain or otherwise prevent the execution and delivery of this
Agreement by Buyer.
<PAGE>
 
ARTICLE 14 - REPRESENTATIONS AND WARRANTIES OF SELLER.

Seller represents and warrants to Buyer as follows:

           Section 14.1 Organization, Good Standing and Corporate Power. Seller
is a corporation duly organized, validly existing and in good standing under the
laws of the State of Delaware, is duly qualified as a foreign corporation in the
State of Texas, and has all requisite corporate power and authority to carry on
its business as presently conducted, to enter into this Agreement and perform
its obligations hereunder.

           Section 14.2 Authority Relative to Agreement. The execution, delivery
and performance by Seller of this Agreement have been duly and effectively
authorized by all necessary corporate action. This Agreement has been duly
executed and delivered by Seller and is a legal, valid and binding obligation of
Seller enforceable in accordance with its terms, except insofar as enforcement
may be limited by (i) bankruptcy, insolvency, reorganization or similar laws
relating to or affecting the enforcement of creditors' rights generally, and
(ii) general principles of equity.

           Section 14.3 No Conflict with Other Instruments or Proceedings.
Neither the execution and delivery of this Agreement, nor the performance or
compliance with the terms and conditions hereof conflict with, or will result in
a breach by Seller of, or constitute a default under, or result in the creation
of any lien, charge or encumbrance upon, any asset of Seller pursuant to any of
the terms conditions or provisions of (i) the Certificate of Incorporation or
Bylaws of Seller, (ii) any material mortgage, deed of trust, lease, contract,
agreement or other instrument to which Seller is a party or by which Seller may
be bound or affected, or (iii) any writ, order, judgment, decree, statute,
ordinance, regulation or any other restriction of any kind or character, to
which Buyer is subject, or by which Seller may be bound or affected.

           Section 14.4 No Litigation or Proceedings. As of the date hereof,
there are no actions, suits, investigations or proceedings pending or, to
Seller's knowledge, threatened against Seller at law or in equity or before or
by any federal, state, municipal or other governmental or non-governmental
department, commission, board, bureau, agency or instrumentality seeking to
enjoin, restrain or otherwise prevent the execution and delivery of this
Agreement by Buyer.

           Section 14.5 Compliance with Laws. Seller represents that Seller's
Facility will be operated in compliance with all applicable laws, and that the
Carbon Monoxide, Blend Gas, Hydrogen and Steam produced by Seller's Facility
will be produced in compliance with all applicable laws, including without
limitation the Fair Labor Standards Act of 1938, as amended.

           Section 14.6 Proprietary Rights. Seller has, and after Startup and
throughout the Term will continue to have, full and sufficient rights to use and
practice all technology, proprietary information, know-how and patented ideas,
designs and inventions
<PAGE>
 
required for the design, construction and operation of Seller's Facility (the
"Proprietary Rights"). None of the ownership, license, access to, use or
practice of the Proprietary Rights by Seller at Seller's Facility do or will
infringe on the rights of any third party and all Proprietary Rights are valid
and enforceable.

ARTICLE 15 - METERING EQUIPMENT

           Section 15.1 Meter Testing. Seller, at its expense, will test and
calibrate the Blend Gas Totalizer, the Carbon Monoxide Totalizer, the Hydrogen
Totalizer and the Steam Totalizer (hereinafter collectively called the "Metering
Equipment") annually, and will perform a verification of pressure and transducer
calibration semi-annually. The Metering Equipment shall be calibrated to
Compressed Gas Association Standards. Seller will provide Buyer with written
notice so that Buyer may have its representatives present during such
calibrations and tests. Readings will be corrected to standard cubic feet
measured at 60 degrees Fahrenheit and 14.696 pounds per square inch absolute
pressure. At any time requested by Buyer, Seller will test the Metering
Equipment in the presence of Buyer's representatives and, if the Metering
Equipment is found on such test to be accurate, Buyer will pay Seller the cost
and expense of such test, but, if found on such test to be inaccurate, then the
cost and expense of such test and of correcting the inaccuracy in the Metering
Equipment will be borne by Seller. If, on any test or calibration the Metering
Equipment is found to be inaccurate, a correcting invoice will be tendered to
cover the actual amount of Carbon Monoxide, Blend Gas, Hydrogen, Supplemental
Hydrogen and Steam delivered to Buyer through the Metering Equipment for the
thirty (30) day period prior to the date on which such calibration or test was
made, or the period from the date such Metering Equipment was last tested and
considered accurate, whichever period is shorter. If, on any test of the
Metering Equipment, its accuracy is not in excess of two percent (2%) either
fast or slow, the Metering Equipment will be considered accurate.

ARTICLE 15 - Data Transmission. Seller will provide equipment, hardware and a
connection to the battery limits of Seller's Facility and Buyer will provide
equipment, hardware and a connection so as to permit the continuous transmission
of digital data relating to Product and utility metering by Seller, and the
reception thereof by Buyer. Buyer will only have access to Product and utility
metering information through the connection. Such access will be limited to
"read only" capability and Buyer will have no ability to control the operation
of Seller's Facility.

ARTICLE 16 - (***)
<PAGE>
 
ARTICLE 17 - EXCESS PRODUCTION

           In the event that excess Carbon Monoxide or Hydrogen is produced or
otherwise becomes available as the result of the production requirements of
Buyer's Plant or Seller's Facility, Buyer will, if it is economically feasible,
use its reasonable efforts to burn the excess Carbon Monoxide or Hydrogen, as
the case may be, in the off-gas fuel system of Buyer's Plant. To the extent, if
any, that Buyer is successful in so burning such excess Carbon Monoxide or
Hydrogen, Buyer will credit Seller for Buyer's avoided cost, if any, of fuel
that Buyer would have otherwise purchased. Buyer's determination of its avoided
cost shall be final and binding on Seller. During the Term Seller will not,
without the prior written consent of Buyer, sell or deliver any Carbon Monoxide
from Seller's Facility to any other person or entity.

ARTICLE 18 - EVENTS OF DEFAULT; DISPUTE RESOLUTION
          
           Section 18.1 Events of Default. Each of the following shall be deemed
an "Event of Default" by the party to whom such event is applicable under this
Agreement:

           (a) if either party shall fail to perform or observe any of the
terms, covenants, conditions, agreements or obligations of this Agreement
required to be observed and performed in this Agreement by such party, and such
failure shall continue for a period of thirty (30) days after notice thereof has
been delivered to such party; or

           (b) if either party or the Guarantor shall make a general assignment
for the benefit of its creditors, or shall file a voluntary petition in
bankruptcy, or shall be adjudicated bankrupt or insolvent, or shall file any
petition or answer seeking, consenting to, or acquiescing in reorganization,
arrangement, adjustment, composition, liquidation, dissolution or similar relief
under any present or future statute, law or regulation, or shall file an answer
admitting or failing to deny the material allegations of a petition against it
for any such relief, or shall admit in writing its inability to pay its debts as
they mature; or

           (c) if any proceeding against either party or the Guarantor seeking
any of the relief mentioned in clause (b) of this Article 18 shall have been
commenced and shall not have been stayed or dismissed within ninety (90) days
after commencement; or

           (d) if a trustee, receiver or liquidator of either party or the
Guarantor or of any substantial part of the properties or assets of such party
or the Guarantor shall be appointed with the consent or acquiescence of such
party or the Guarantor, or if any such appointment, if not so consented to or
acquiesced in, shall remain unvacated or unstayed for a period of ninety (90)
days; or

           (e) if either party or the Guarantor shall be liquidated or
dissolved, or shall begin proceedings toward such liquidation or dissolution; or

           (f) if any of the material representations or
<PAGE>
 
warranties made by either party in this Agreement proves to be untrue in any
material respect; or

           (g) A default or Event of Default by either party occurs under the
Utilities Agreement or the Ground Lease Agreement, which default or Event of
Default is not cured within any applicable cure period.

           Section 18.2 Dispute Resolution Meeting. In the event that a party to
this Agreement has reasonable grounds to believe that an Event of Default has
occurred and is continuing, or that its expectation of receiving due performance
under this Agreement may be impaired, such party will promptly notify the other
party in writing of the substance of its belief and, as appropriate, declare
that an Event of Default has occurred or demand adequate assurance of due
performance. The party receiving such notice and/or demand must respond in
writing within twenty (20) days of receipt of such notice and provide (i)
evidence of cure of and/or its ongoing best efforts to cure the condition
specified, (ii) an explanation of why it believes that its performance is in
accordance with the terms and conditions of this Agreement, and/or (iii)
adequate assurance of due performance, as required by the claiming party's
notice. Failure to respond within said twenty (20) day period shall be deemed an
admission that an Event of Default has occurred or that due performance is
impaired. The responding party shall also include in its written response three
(3) dates, all of which must be within thirty (30) days following the date of
such response, for a meeting to resolve the dispute and/or evaluate the adequacy
of the assurance of due performance. The party declaring an Event of Default or
seeking adequate assurance of performance will then select one (1) of the three
(3) dates, and a dispute resolution meeting will be held on such date. Either
party shall have the right to demand that individuals representing each of the
companies who have the authority to execute this Agreement, or amendments
hereto, or waivers hereof, and to authorize or agree to curative action, be in
attendance at such dispute resolution meeting.

           Section 18.3 Failure to Resolve Dispute; Arbitration. (a) If the
parties cannot, in good faith discussions, resolve their dispute during the
dispute resolution required by Section 18.2, then either party may given notice
of a request for arbitration and subject to the provisions of Section 18.4 such
controversy shall be referred to and resolved by arbitration under the most
current version of the Commercial Arbitration Rules of the American Arbitration
Association. The board of arbitrators shall be composed of three arbitrators.
Each party shall choose an arbitrator and the third shall be chosen by the two
so chosen. If either party to the controversy fails to choose an arbitrator
within thirty (30) days after notice of commencement of arbitration, or if the
two arbitrators fail to choose a third arbitrator within thirty (30) days after
their appointment, the American Arbitration Association shall, upon the request
of either party, appoint the arbitrator or arbitrators to constitute or complete
the board. The place of
<PAGE>
 
arbitration shall be Houston, Texas and the arbitration shall be held within
thirty (30) days after the appointment of the arbitration board. The arbitration
award shall be final and binding upon the parties to such arbitration and
judgment thereon may be entered in any court having jurisdiction.

           (b) In connection with any such arbitration proceeding, the board of
arbitrators shall have the right to grant all remedies that such board deems
appropriate including, without limitation, monetary damages and/or the
termination of this Agreement, the Ground Lease and the Utilities Agreement. The
board of arbitrators shall also have the right to require the losing party to
reimburse the prevailing party for all reasonable attorneys' fees and costs
incurred in connection with all such proceedings.

           Section 18.4 Right to Terminate Agreement. Notwithstanding the
provisions of Section 18.1 and 18.2, either party may decline to pursue
arbitration and elect to terminate this Agreement if any of Events of Default
specified in Section 8.1(b)-(e) shall have occurred.

ARTICLE 19 - ACCESS TO INFORMATION

           Section 19.1 Access to Information. Upon written request by Buyer
from time to time, but subject to Section 19.4, Seller shall provide to Buyer,
its attorneys, accountants and other representatives, at reasonable times during
normal business hours, access to Seller's books, records and accounts in
connection with the operation of Seller's Facility as it relates to the
performance of Seller's obligations under this Agreement. Subject to the
provisions of Section 19.4, Buyer shall thereupon have the right to make copies
of and abstracts from such books, records and accounts, at Buyer's expense,
which copies may be removed from Seller's premises and retained by Buyer. All
information disclosed to Buyer pursuant to this Agreement shall be subject to
the confidentiality provisions of Section 22.2 hereof.

           Section 19.2 Access to Seller's Facility. Subject to Section 19.4,
Seller agrees to permit representatives of Buyer, at Buyer's expense, to have
access to Seller's Facility at reasonable times and on reasonable notice to
obtain information relating to the present or proposed operations of Seller's
Facility so long as such access does not materially disrupt the operation of
Seller's Facility. Buyer will pay all costs incurred by Buyer relating to
Buyer's exercise of its rights under this Section 19.2.

           Section 19.3 Access to Seller's Personnel. Subject to Section 19.4,
Seller shall make its employees and other representatives available to Buyer at
reasonable times on reasonable notice to discuss the present or proposed
operations of Seller's Facility so long as such availability does not materially
disrupt the operation of Seller's Facility.

           Section 19.4 Limitations on Disclosure. Seller has represented to
Buyer that certain of the Proprietary Rights relating to Seller's
<PAGE>
 
Facility have been provided to Seller by Texaco, Inc. pursuant to the terms of a
license agreement that prohibits Seller from disclosing the information provided
by Texaco, Inc. (the "Texaco Information") to Buyer. Nothing in this Agreement
shall be construed as requiring Seller to provide any of the Texaco Information
to Buyer.

ARTICLE 20 - CAPACITY OF SELLER'S FACILITY

           Section 20.1 Initial Capacity. Seller represents and warrants to
Buyer that, at the time of Startup, the maximum instantaneous capacity of
Seller's Facility to produce Products shall be at least (***) greater than the
Contract Volume of Products. Buyer acknowledges that Seller has initially
configured Seller's Facility to operate efficiently at the Contract Volume of
Products and has been designed to produce up to (***) of the Contract Volume of
Products under certain ambient temperatures and operating conditions.

           Section 20.2 Capacity Expansion. Seller represents and warrants to
Buyer that, at the time of Startup, the maximum instantaneous capacity of
Seller's Facility to produce Products may be increased to an ultimate
instantaneous capacity of at least (***) of the Contract Volume of Products.
Seller agrees that, upon not less than (***) advance written notice from Buyer,
Seller will at its sole cost and expense take the actions necessary to expand
the maximum instantaneous capacity of Seller's Facility to at least (***) of the
Contract Volume of Products (or such greater capacity as may be mutually
agreed). In exchange for such increase in the maximum instantaneous capacity of
Seller's Facility, Buyer agrees to increase the Fixed Fee to (***) (or such
lesser amount as may be mutually agreed). The parties acknowledge that such
capacity expansion will result in reductions in the usage of Natural Gas,
electricity and cooling water supplied by Buyer to Seller pursuant to the
Utilities Agreement at production rates above the Contract Volume of Products,
and may result in increases in the usage of Natural Gas, electricity and cooling
water supplied by Buyer to Seller pursuant to the Utilities Agreement at
production rates below the Contract Volume of Products.
ARTICLE 21 - INITIAL AND ADDITIONAL TERMS

           Section 21.1 Initial Term. The term of this Agreement shall be for a
period commencing on the date of the execution of this Agreement and ending at
midnight on July 31, 2016, unless earlier terminated as provided herein
("Initial Term"); provided, that if either or both Buyer or Seller exercises its
option to extend this Agreement as provided in Section 7.5, the Initial Term
shall include the period of any such extensions.

           Section 21.2 Additional Terms. Subject to the terms of this Section
21.2, Buyer shall have the option to extend this Agreement beyond the Initial
Term for up to two (2) additional
<PAGE>
 
terms of five (5) years each. If this Agreement has not been terminated prior to
the end of the Initial Term, the option to extend this Agreement beyond the
Initial Term for an additional five (5) years shall be deemed to have been
exercised by Buyer, and the Initial Term shall be automatically extended for a
period of five (5) years after the end of the Initial Term (the "First
Additional Term"), unless Buyer shall have given Seller notice no later than one
(1) year prior to the expiration of the Initial Term that Buyer has elected not
to extend the Initial Term. If this Agreement has not been terminated prior to
the end of the First Additional Term, the option to extend this Agreement beyond
the First Additional Term for an additional five (5) year period shall be deemed
to have been exercised by Buyer, and the First Additional Term shall be
automatically extended for a period of five (5) years after the end of the First
Additional Term (the "Second Additional Term"), unless Buyer shall have given
Seller notice no later than one (1) year prior to the expiration of the First
Additional Term that Buyer has elected not to extend the First Additional Term.
The Initial Term, the First Additional Term (if any) and the Second Additional
Term (if any) are referred to in this Agreement as the "Term."

ARTICLE 22 - MISCELLANEOUS

           Section 22.1 Assignment. (a) This Agreement shall inure to the
benefit of and bind the respective successors and permitted assigns of the
parties hereto. Except as expressly permitted hereby, neither party may assign
this Agreement or its rights under this Agreement, including its rights to
receive payments hereunder, to any other party without the consent of the other.

           (b) Either party may assign this Agreement and all of its rights and
obligations hereunder to any subsidiary, Affiliate, partnership or venture, in
which such party (or its parent company) holds an interest of 50% or more.

           (c) It is agreed that (i) the sale, transfer or conveyance by Buyer
or Seller of all or substantially all of its assets, or (ii) the merger,
consolidation, reorganization or recapitalization of Buyer or Seller with any
third party, or (iii) the change of control of Buyer or Seller, whether effected
by stock purchase, statutory share exchange, or otherwise, shall not constitute
an assignment of this Agreement by Buyer or Seller, but Buyer or Seller (as the
case may be) shall, as a condition precedent to the closing of any sale,
transfer or conveyance referred to in clause (i) above, require the purchaser or
transferee to assume all rights and obligations of Buyer or Seller (as the case
may be) under this Agreement, the Ground Lease and the Utilities Agreement. In
the event that Buyer sells or otherwise transfers or conveys all or
substantially all of the assets constituting Buyer's Plant, such sale, transfer
or conveyance shall not constitute an assignment of this Agreement by Buyer, but
Buyer shall, as a condition precedent to the closing
<PAGE>
 
of such sale, transfer or conveyance, require the purchaser or transferee to
assume all rights and obligations of Buyer under this Agreement, the Ground
Lease and Utilities Agreement. In the event that Seller sells or otherwise
transfers or conveys all or substantially all of the assets constituting
Seller's Facility, such sale, transfer or conveyance shall not constitute an
assignment of this Agreement by Seller, but Seller shall, as a condition to the
closing of such sale, transfer or conveyance, require the purchaser or
transferee to assume all rights and obligations of Seller under this Agreement,
the Ground Lease and Utilities Agreement.

           (d) No assignment, transfer or conveyance of this Agreement by either
party shall relieve the assigning party (or Guarantor) of any of its
obligations, liabilities or duties hereunder (or under the Guaranty), unless the
other party hereto shall agree otherwise.

           (e) Any assignment of this Agreement by either party shall be
accompanied by the contemporaneous (i) assumption by the assignee of all rights
and obligations of assignor hereunder, and (ii) assignment of the Ground Lease
and the Utilities Agreement.

           Section 22.2 Confidentiality. (a) In connection with this Agreement,
the parties hereto have exchanged and will continue to exchange certain
nonpublic, proprietary or confidential information of a technical, business or
financial nature (the "Confidential Information"). In order to facilitate
discussion between Buyer and Seller relating to the design, construction,
operation and maintenance of Seller's Facility and the purchase and sale of
Products pursuant to this Agreement, Buyer and Seller desire to provide each
other with assurances that Confidential Information will not be divulged.

           (b) For purposes of this Agreement, Confidential Information shall
consist of this Agreement and all nonpublic, proprietary or confidential
information whether obtained from observation or from materials, information or
data submitted by the other party or from oral or written disclosures, and shall
include, without intent to limit, all plans (including marketing plans,
marketing information, sales information (including sales history and sales
projections), designs, specifications, prices, processes, compositions and the
like related to this Agreement, the Products, the operation of Seller's Facility
or Buyer's Plant, and believed by the disclosing party to be unpublished and the
disclosing party's private information at the time of its disclosure, and all
memoranda, notes or other documents prepared by the receiving party which embody
in whole or in part any of such information. However, the restrictions of this
Section 22.2 shall apply only to written information, drawings and other
tangible information and the like, as described above which are clearly marked
"Confidential" or designated confidential in writing given to the receiving
party orally, designated as confidential orally when revealed and confirmed in
writing within thirty (30) days of disclosure as "Confidential" referencing the
data and type of information
<PAGE>
 
disclosed. All other information whether disclosed in writing, orally or
observed shall be considered as having been disclosed on a nonconfidential
basis.

           (c) Each party agrees that it will treat the Confidential Information
of the other party as confidential and will use the same care and caution that
it affords its own proprietary information to protect such Confidential
Information received under this Agreement from disclosure to any third party.
Each party agrees to use the Confidential Information solely and exclusively for
purposes of this Agreement and agrees to disclose the Confidential Information
only to those individuals within its own organization who have a need to receive
the information and who will be bound by nondisclosure agreements with the
receiving party.

           (d) The restrictions of this Agreement shall not apply to any
Confidential Information which (i) is now or hereafter becomes available to the
public without a breach by the receiving party of the terms stated in this
Agreement; (ii) is known to or in the possession of the receiving party as
evidenced by documentary material in its possession before disclosure hereunder
and the receiving party is not already obligated to the disclosing party to
maintain it in confidence; (iii) is disclosed to the receiving party by a third
party not under any obligation of secrecy or confidentiality to the disclosing
party at the time of such disclosure; (iv) can be shown by substantial evidence
was independently developed by employees of the receiving party who have not had
access to the Confidential Information of the disclosing party; or (v) the
receiving party is, in the opinion of its counsel, compelled by law to disclose;
provided that in such cases the disclosure will be limited to the minimum to the
extent possible without involving violation of applicable laws and the
disclosing party will be given at least forty-eight (48) hours prior notice of
the disclosure which is to be made.

           (e) Unless otherwise agreed to by the parties, each party agrees that
it shall keep all Confidential Information confidential for a period which shall
expire five (5) years after the termination date of this Agreement.

           Section 22.3 Applicable Law. This Agreement will be governed by the
laws of the State of Texas.

           Section 22.4 Notice. Except as otherwise specifically provided in
this Agreement, all notices, requests, demands, invoices, directions, and other
communications under this Agreement shall be in writing signed by an authorized
representative of the party issuing same and shall be deemed to have been duly
given on the date of service if served personally on the party to whom notice is
to be given or if delivered by facsimile transmission, or on the second day
after mailing if mailed to the party to whom notice is to be given by certified
or registered mail, postage prepaid, return receipt requested, and properly
addressed as follows:

           In the case of Seller:
           Praxair Hydrogen Supply, Inc.
<PAGE>
 
           222 Pennbright Dr., Suite 300
           Houston, Texas 77090-5999
           Attention:  Executive Director
           Telecopier Number:  (713) 872-2111

           With a Copy to:

           Praxair Hydrogen Supply, Inc.
           703 Sixth Street South
           Texas City, Texas  77590
           Attention:  Facility Manager
           Telecopier Number:  (409) 943-9228

           In the case of Buyer:

           Sterling Chemicals, Inc.
           1200 Smith St., Suite 1900
           Houston, Texas 77002
           Attention: Business Director
           Telecopier Number:  (713) 654-9551

           With a Copy to:

           Sterling Chemicals, Inc.
           1200 Smith St., Suite 1900
           Houston, Texas 77002
           Attention: General Counsel
           Telecopier Number:  (713) 654-9551

Either party may change its address for purposes of this Section by giving the
other party notice of its new address in the manner set forth above.

           Section 22.5 Waiver. No consent or waiver, express or implied, by a
party, to or of any breach or default by the other party in the performance of
its obligations hereunder, shall be deemed or construed to be a consent or
waiver to or of any other breach or default in the performance by such other
party of the same or any other obligation of such party hereunder. Failure on
the part of any party to complain of any act or failure to act of the other
party or to declare the other party in breach or default irrespective of how
long such failure, breach or default continues, shall not constitute a waiver by
such party of its right hereunder.

           Section 22.6 Headings. The headings and titles contained in this
Agreement are for convenience of reference only, and shall not affect the
meaning or interpretation of any provision hereof.

           Section 22.7 Entire Agreement. This Agreement, the Ground Lease and
the Utilities Agreement constitute the entire agreement between the parties
hereto regarding the subject matter
<PAGE>
 
thereof and supersede any and all prior agreements regarding the same subject
matter except as expressly provided herein or therein. This Agreement, the
Ground Lease and the Utilities Agreement are part of a single, integrated
transaction, and the provisions thereof shall be construed together in a
consistent manner and any termination of the Ground Lease or the Utilities
Agreement shall effect a termination of this Agreement. Other than the
provisions of the Ground Lease, the Utilities Agreement and the Guaranty, there
are no other promises, representations or warranties affecting this Agreement,
and any other or different terms and conditions appearing in any purchase orders
issued or accepted hereunder shall be deemed null and void.

           Section 22.8 Relationship between Parties. The relationship between
Buyer and Seller created pursuant to this Agreement is an independent contractor
relationship and, subject to the terms and conditions of this Agreement, Seller
shall exercise the sole and exclusive right to control the ways, means and
manner of providing the Products to Buyer under this Agreement. Seller shall be
solely responsible for the selection, training, supervision and compensation of
the personnel used by Seller to provide Products to Buyer. This Agreement shall
not be construed as creating a partnership, joint venture, association or other
entity or business organization, or as creating a principal-agent or other
fiduciary relationship between Seller and Buyer.

           Section 22.9 Severability. If any provision of this Agreement or the
application thereof to any person or circumstance shall be invalid or
unenforceable to any extent, the remainder of this Agreement and the application
of such provision, to other persons or circumstances shall not be affected
thereby and shall be enforceable to the greatest extent permitted by law.

           Section 22.10 Amendment. This Agreement may be amended only by
written amendment executed by both parties.

           Section 22.11 Pronouns and Plurals. Whenever the context may require
any pronoun used in this Agreement shall include the corresponding masculine,
feminine, or neuter forms, and the singular form of nouns, pronouns and verbs
shall include the plural and vice versa.

           Section 22.12 Section Numbers. Unless otherwise indicated, references
to section numbers are to sections of this Agreement. IN WITNESS WHEREOF, the
parties have caused this Agreement to be executed as of the date first above
written.

                                    PRAXAIR HYDROGEN SUPPLY, INC.
                                    By:    /s/ J. E. Gonzalez
                                    Name:  J. E. Gonzalez
                                    Title: President
<PAGE>
 
                                    STERLING CHEMICALS, INC.
                                    By:    /s/ Robert W. Roten
                                    Name:  Robert W. Roten
                                    Title: Chief Operating Officer
<PAGE>
 
EXHIBIT A
FEE CALCULATIONS
(***)
<PAGE>
 
EXHIBIT B
TEXAS CITY SYNGAS PLANT
STERLING CHEMICALS SITE (***)
<PAGE>
 
EXHIBIT C
SPECIFICATIONS FOR CARBON MONOXIDE,
BLEND GAS, HYDROGEN AND STEAM
(***)
<PAGE>
 
EXHIBIT D
NATURAL GAS
DESIGN PROPERTIES
(***)


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