DUPONT E I DE NEMOURS & CO
SC 13D, 1997-02-07
PLASTIC MATERIAL, SYNTH RESIN/RUBBER, CELLULOS (NO GLASS)
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                      SECURITIES AND EXCHANGE COMMISSION
                             Washington, DC 20549

                                 Schedule 13D

                   Under the Securities Exchange Act of 1934


                           Hudson Technologies, Inc.
                    --------------------------------------
                               (Name of Issuer)

                         Common Stock, par value $0.01
                    --------------------------------------
                        (Title of Class of Securities)

                                  444144-10-9
                    --------------------------------------
                                (CUSIP Number)

                              John W. Ward, Esq.
                     E. I. du Pont de Nemours and Company
                                1007 Market St.
                             Wilmington, DE 19898
                                (302) 774-4103
                    --------------------------------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)

                               January 29, 1997
                             --------------------
                     (Date of Event which Requires Filing
                              of this Statement)

If the filing person has previously filed a statement on Schedule 13G to 
report the acquisition which is the subject of this Schedule 13D, and is 
filing this schedule because of Rule 13d-1(b)(3) or (4), check the following 
box [  ].

Note:  Six copies of this statement, including all exhibits, should be filed 
with the Commission.  See Rule 13d-1(a) for other parties to whom copies are 
to be sent.
*The remainder of this cover page shall be filled out for a reporting person's 
initial filing on this form with respect to the subject class of securities, 
and for any subsequent amendment containing information which would alter 
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be 
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange 
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of 
the Act but shall be subject to all other provisions of the Act (however, see 
the Notes).
<PAGE>



     This Schedule 13D is filed pursuant to Rule 13d-1 of the 
Rules and Regulations under the Securities Exchange Act of 1934, 
as amended (the "Exchange Act") by E. I. du Pont de Nemours and 
Company, a Delaware corporation ("DuPont") and by Du Pont 
Chemical and Energy Operations, Inc., a Delaware corporation and 
wholly owned subsidiary of DuPont ("DCEO"), with respect to the 
common stock of Hudson Technologies, Inc., a New York corporation 
("HDSN" or the "Issuer"):

Item 1.   Security and Issues.

      This Schedule 13D relates to the Common Stock, par value 
$0.01 per share ("Common Stock"), of HDSN.  The principal 
executive offices of HDSN are located at 25 Torne Valley Road, 
Hillburn, New York 10931-9900.

Item 2.   Identity and Background.

      This Schedule 13D is filed by DuPont and by DCEO.  The 
principal executive offices of both corporations are located at 
1007 Market Street, Wilmington, Delaware 19898.

      DuPont is one of the two largest United States chemical 
producers and is one of the leading chemical producers worldwide.
It conducts fully integrated petroleum operations primarily 
through its wholly owned subsidiary Conoco Inc. and, in 1994, 
ranked eighth in the worldwide production of petroleum liquids by 
U.S.-based companies, tenth in the production of natural gas, and 
sixth in refining capacity.  Conoco Inc. and other subsidiaries 
and affiliates of DuPont conduct exploration, production, mining, 
manufacturing or selling activities, and some are distributors of 
products manufactured by DuPont.  DuPont operates globally 
through approximately twenty strategic business units.  Within 
the strategic business units approximately 85 businesses 
manufacture and sell a wide range of products to many different 
markets, including the energy, transportation, textile, 
construction, automotive, agricultural, printing, health care, 
packaging and electronics markets.  DuPont and its subsidiaries 
have operations in about 70 nations worldwide and, as a result, 
approximately 50% of consolidated sales are derived from sales 
outside the United States, based on the location of the corporate 
unit making the sale.  Total worldwide employment at year-end 
1995 was about 105,000 people.
<PAGE>


      DCEO was incorporated in Delaware in 1988 and is limited 
by its certificate of incorporation to the making, maintenance 
and management of its intangible investments and the collection 
and distribution of the income from such investments.  DCEO is a 
wholly owned subsidiary of DuPont.

      Information concerning the directors and executive 
officers of DuPont and DCEO is contained in Schedule A attached 
hereto.

      During the last five years, none of DuPont or DCEO nor, to 
the best knowledge of DuPont and DCEO, any director or executive 
officer of DuPont or DCEO has been (i) convicted in a criminal 
proceeding or (ii) a party to a civil proceeding of a judicial or 
administrative body of competent jurisdiction and as a result of 
such proceeding has been or is subject to a judgment, decree or 
final order enjoining future violations of, or prohibiting or 
mandating activities subject to, federal or state securities laws 
or finding any violation with respect to such laws.

Item 3.   Source and Amount of Funds or Other Consideration.

      DCEO purchased 500,000 of HDSN common stock in a private 
placement from HDSN pursuant to a Stock Purchase Agreement dated 
January 29, 1997, for a cash payment of $3,500,000, all of which 
was obtained from cash provided by DCEO's holdings.

Item 4.   Purpose of Transaction.

      Reference is made to the agreements discussed in Item 6 
below (collectively, the "Agreements").

      On January 29, 1997, DuPont and HDSN formed a strategic 
alliance pursuant to which HDSN will provide refrigerant 
recovery, reclamation, separation, packaging and testing services 
directly to DuPont for marketing through the DuPont 
Fluoroproducts Business authorized distribution network.  In 
addition, HDSN will market DuPont refrigerant products to 
selected market segments together with HDSN reclamation and 
refrigerant management services.  Concurrent with the alliance, 
DCEO acquired 500,000 shares of HDSN common stock in order to 
enable DCEO to obtain a substantial equity interest in HDSN.  
Based upon publicly available information, DCEO believes that it 
will be the largest HDSN shareholder.  Accordingly, DCEO may in 
<PAGE>


the future seek representation on HDSN's Board of Directors 
pursuant to the Agreements discussed below.

      Except as noted above regarding potential future 
representation on HDSN's Board of Directors, DuPont and DCEO 
currently have no present plans or proposals of a type which 
would be required to be disclosed in this Statement.  Neither 
DuPont nor DCEO have any present plans to acquire additional 
shares, but they may do so (to the extent permitted under the 
Agreements) depending upon future market conditions and other 
factors.  DuPont and DCEO also reserve the right to dispose of 
some or all of the shares presently owned (as permitted by the 
Agreements), but each of them have no present plans in this 
regard.

Item 5.   Interest in Securities of the Issuer.

      As of January 29, 1997, DCEO directly owns 500,000 shares 
of Common Stock of the HDSN.  Such shares constitute 
approximately 10 percent of the total number of shares of Common 
Stock outstanding as of such date.  No director or executive 
officer of DuPont or DCEO beneficially owns any shares of Common 
Stock of the HDSN.

Item 6.   Contracts, Arrangements, Understandings or 
          Relationships With Respect to Securities of the 
Issuer.

      DuPont, DCEO, HDSN and certain HDSN stockholders have 
entered into several agreements dated as of January 29, 1997 (the 
"Agreements"), which are filed as exhibits to this Agreement.  
Reference is made to such exhibits for the complete text of the 
Agreements, and the following description of the Agreements is 
qualified by such reference.

      The Agreements provide, among other things, that, during 
their term:

      (1) As a general matter, DuPont and its subsidiaries 
(collectively, the "DuPont Group") will not acquire voting 
securities of HDSN if the effect of such acquisition would be to 
increase the ownership of the DuPont Group to more than 20% of 
<PAGE>


the combined voting power of all voting securities of HDSN at the 
time outstanding.  DuPont will be relieved of this restriction if 
(a) any other person acquires, or makes a tender or exchange 
offer for, HDSN voting securities representing more than 20% of 
the combined voting securities at the time outstanding, (b) it is 
publicly disclosed or DuPont otherwise learns that voting 
securities representing more than 20% of the total voting power 
have been acquired subsequent to January 1, 1997, or are proposed 
(in a public announcement or filing) to be acquired subsequent to 
such date by any person or group, or (c) any person shall 
beneficially own voting securities representing a percentage of 
total voting power which exceeds the greater of (x) 10% or (y) 
the percentage of total voting power represented by the DuPont 
voting power at such time, or (d) pursuant to its rights to 
purchase voting securities under the Shareholders Agreement 
between DCEO, DuPont, the Company and certain principal 
shareholders of the Company dated January 29, 1997 (the 
"Shareholders Agreement").

      (2) No member of the DuPont Group will solicit proxies or 
become a "participant" in a "solicitation" (as those terms are 
defined in Regulation 14A under the Securities Act of 1934) in 
opposition to the recommendation of the majority of the directors 
of HDSN with respect to any matter, except that if DuPont may 
oppose any solicitation by HDSN's management with respect to any 
Significant Event.  For this purpose, the term "Significant 
Event" means any charter or bylaw amendment (other than a 
proposal to require cumulative voting in the election of 
directors), acquisition or disposition of assets (by way of 
merger, consolidation or otherwise), change in capitalization, 
liquidation, or other action out of the ordinary course of 
business of HDSN.

      (3) No member of the DuPont Group will offer, sell or 
transfer any HDSN voting securities without offering HDSN a right 
of first refusal in the manner specified in the Agreements, 
except that these provisions will not apply to transfers (a) to 
any member of the DuPont Group, (b) pursuant to a bona fide 
public offering, registered under the Securities Act of 1933 (the 
"Act"), so long as no sales are made to any person or related 
group who would thereafter own more than 5% of the total combined 
voting power of HDSN voting securities then outstanding, or (c) 
pursuant to Rule 144 under the Act"), so long as no sales are 
made to any person or related group who would thereafter own more 
than 5% of the total combined voting power of HDSN voting 
securities then outstanding.

      (4) Upon DuPont and DCEO's written request, two designees 
of DuPont and DCEO will be elected to the HDSN Board of 
<PAGE>


Directors, provided that the DuPont Group continues to 
beneficially own 50% of the HDSN shares purchased.

      (5) HDSN will not take or recommend to its shareholders 
without DuPont's consent any action which would impose 
limitations on the legal rights of the DuPont Group as HDSN 
shareholders other than those imposed pursuant to the express 
terms of the Agreements, provided that the DuPont Group continues 
to beneficially own 50% of the HDSN shares purchased.

      (6) HDSN will provide to DCEO a "demand" registration 
right if DCEO should desire to dispose of its shares after 
January 29, 1999.

      (7) DuPont and DCEO have agreed with certain other HDSN 
shareholders not to sell any HDSN shares for one year, except for 
certain de minimus sales by such HDSN shareholders into the 
public market pursuant to any registered public offering or Rule 
144 under the Securities Act of 1933.

      (8) Pursuant to the Shareholders' Agreement, such HDSN 
shareholders have provided DuPont and DCEO certain rights of 
first refusal to buy shares of HDSN currently held or later 
acquired pursuant to stock options currently held by such 
shareholders along with certain rights to include shares held by 
the DuPont Group in certain sales by any such shareholder to 
certain third parties, and such HDSN shareholders have agreed to 
vote their shares for any DuPont and DCEO designees to the HDSN 
Board of Directors as discussed above.

      The term of the Standstill Agreement expires on January 
29, 2002.  Upon termination of the Agreement, all covenants of 
the parties expire. The Agreement may be terminated prior to the 
stated termination date if (a) a party defaults in its 
obligations or (b) DuPont's designees are not elected.  If this 
termination notice is given, any of DuPont's designees will 
resign from the HDSN Board.  The term of the Shareholders' 
Agreement expires on January 29, 2002, unless prior thereto the 
DuPont Group does not continue to beneficially own at least 50% 
of the HDSN shares purchased.

      Except for the foregoing agreements and the alliance 
agreements discussed above, there are no other contracts, 
arrangements, understandings or relationships (legal or 
<PAGE>


otherwise) among the persons named in Item 2 and between such 
persons and any person with respect to any securities of HDSN.

Item 7.   Material to be Filed as Exhibits.

      The following agreements are filed as an exhibit to this 
Schedule 13D.

         A.  Agreement dated February 5, 1997, between 
             DuPont and DCEO in which both agree that this 
             Schedule is filed on behalf of both of them.

         B.  Stock Purchase Agreement dated January 29, 
             1997.

         C.  Shareholders' Agreement dated January 29, 1997.

         D.  Standstill Agreement dated January 29, 1997.

         E.  Registration Agreement dated January 29, 1997.

<PAGE>


                            SIGNATURE

     After reasonable inquiry and to the best of my knowledge 
and belief, I certify that the information set forth in this 
Statement is true, complete and correct.

                              E. I. DU PONT DE NEMOURS AND 
                                   COMPANY

                              By:     /s/ JOHN C. SARGENT
                                 -------------------------------
                                        John C. Sargent
                                 Vice President and Treasurer


                              DU PONT CHEMICAL AND ENERGY
                                   OPERATIONS, INC.

                              By:      /s/ C. L. DOWNING
                                 -------------------------------
                                        C. L. Downing
                                        Vice President
<PAGE>


                           SCHEDULE A
                           ----------
     1.   Set forth below are the name, address and present 
principal occupation or employment with E. I. du Pont de Nemours 
and Company of each director and executive officer.  With the 
exception of Percy N. Barnevik, who is a Swedish Citizen, each 
person listed below is a citizen of the United States of America.

NAME AND ADDRESS                 POSITION
- ----------------                 --------
Directors:
- ---------

Percy N. Barnevik                Chairman and Chief Executive
ABB Asea Brown Boveri Ltd.       Officer
P.O. Box 8131                    ABB Asea Brown Boveri Ltd.
CH-8050
Zurich Switzerland

Andrew F. Brimmer                President and Director
Brimmer & Company, Inc.          Brimmer & Company, Inc.
4400 MacArthur Blvd., NW
Suite 302
Washington, DC  20007

Louisa C. Duemling               Director
c/o John Thayer
1100 DuPont Building
1007 Market Street
Wilmington, DE  19898

Archie W. Dunham*                Director
Conoco Inc.
PE-3034
600 North Dairy Ashford
Houston, TX  77079



- -----------------------
* Also President and Chief Executive Officer of Conoco, Inc. and 
an Executive Officer of DuPont

<PAGE>


NAME AND ADDRESS                 POSITION
- ----------------                 --------
Directors:
- ---------

Edward B. du Pont                Director
1011 Wilmington Trust Center
Wilmington, DE 19801

Charles M. Harper                Director
Suite 1500
One Central Park Plaza
Omaha, NE  68102

Lois D. Juliber                  President
Colgate-Palmolive                Colgate-Palmolive
300 Park Avenue                    North America
New York, NY  10022              Colgate-Palmolive Company

John A. Krol *                   Director
Administration
9000 DuPont Building
1007 Market Street
Wilmington, DE 19898

William K. Reilly                Visiting Professor
Institute for International      Stanford University
   Studies
Encina Hall, Room 200
Stanford University
Stanford, CA  91305-6055

H. Rodney Sharp, III             Director
9000 Du Pont Building
1007 Market Street
Wilmington, DE  19898




- ---------------------
* Also President and Chief Executive Officer of DuPont

<PAGE>


NAME AND ADDRESS                 POSITION
- ----------------                 --------
Directors:
- ---------

Charles M. Vest                  President
111 Memorial Drive               Massachusetts Institute of
Cambridge, MA  02142             Technology

Edgar S. Woolard, Jr.            Chairman of the Board
Administration
9000 DuPont Building
1007 Market Street
Wilmington, DE  19898

Executive Officers:
- ------------------
Jerald A. Blumberg               Executive Vice President
Administration
9000 DuPont Building
1007 Market Street
Wilmington, DE  19898

Archie W. Dunham                 Executive Vice President
Conoco Inc.
PE-3034
600 N. Dairy Ashford
Houston, TX  77079

Gary W. Edwards                  Senior Vice President
Conoco Inc.
PE-3052
600 N. Dairy Ashford
Houston, TX  77079

Kurt Landgraf                    Executive Vice President
DuPont Finance
D-8000
1007 Market Street
Wilmington, DE  19898

<PAGE>



NAME AND ADDRESS                 POSITION
- ----------------                 --------
Executive Officers:
- ------------------

Charles O. Holliday, Jr.         Executive Vice President
DuPont Asia Pacific
9000 DuPont Building
1007 Market Street
Wilmington, DE  19898

John A. Krol                     President and CEO
Administration
9000 DuPont Building
1007 Market Street
Wilmington, DE  19898

Robert E. McKee, III             Senior Vice President
Conoco Inc.
PE-3070
600 N. Dairy Ashford
Houston, TX  77079

Joseph A. Miller                 Senior Vice President
DuPont Research and Development
E-328/411
Rt. 141 and Henry Clay
Wilmington, DE  19880

Stacey J. Mobley                 Senior Vice President
DuPont External Affairs
N-9510
1007 Market Street
Wilmington, DE  19898

Howard J. Rudge                  Senior Vice President 
DuPont Legal                     and General Counsel
D-7038
1007 Market Street
Wilmington, DE  19898

<PAGE>




     2.   Set forth below are the name, address and principal 
occupation or employment with DuPont Chemical and Energy 
Operations, Inc. of each director and executive officer.  With 
the exception of Mireille J. Quirina, who is a French citizen and 
Robert Gachot, who is a French citizen, each person listed below 
is a citizen of the United States of America.

NAME AND ADDRESS                 POSITION
- ----------------                 --------
John C. Sargent                  President and Director
8045 DuPont Building
1007 Market Street
Wilmington, DE  19898

Charles L. Downing               Vice President, Treasurer
8045 DuPont Building             and Director
1007 Market Street
Wilmington, DE  19898

Robert P. Gachot                 Director
8045 DuPont Building
1007 Market Street
Wilmington, DE  19898

Mireille J. Quirina              Vice President
2, Chemin du Pavillon
P.O. Box 50
Ch-1218 Le Grand Saconnex
Geneva, Switzerland

<PAGE>



                                                        EXHIBIT A


                            AGREEMENT


     By this Agreement, the undersigned agree that this Schedule 
13D being filed on or about this date with respect to the 
ownership by the undersigned of shares of Common Stock of Hudson 
Technologies, Inc. is being filed on behalf of each of us.

Dated:  FEBRUARY 7, 1997

                              E. I. DU PONT DE NEMOURS AND 
                                   COMPANY

                              By:     /s/ JOHN C. SARGENT
                                 -------------------------------
                                        John C. Sargent
                                 Vice President and Treasurer


                              DU PONT CHEMICAL AND ENERGY
                                   OPERATIONS, INC.

                              By:      /s/ C. L. DOWNING
                                 -------------------------------
                                        C. L. Downing
                                        Vice President

<PAGE>



                                                        EXHIBIT B

                    STOCK PURCHASE AGREEMENT

          This Investment Agreement is made and entered into as 
of January 29, 1997, between E. I. DUPONT DE NEMOURS AND COMPANY 
("DUPONT"), DU PONT CHEMICAL AND ENERGY OPERATIONS, INC. 
("DCEO"), a Delaware corporation and a wholly owned subsidiary of 
DUPONT, and "HUDSON TECHNOLOGIES, INC.", a New York corporation 
("HTI" or "the Company").

                      W I T N E S S E T H:

          WHEREAS, DUPONT, DCEO and HTI are, simultaneously with 
the execution of this Stock Purchase Agreement, entering into a 
certain Registration Agreement and a Standstill Agreement 
(collectively, the above agreements are hereafter referred to as 
the "Agreements"), all of which collectively provide for a 
constructive and mutually beneficial relationship between DUPONT, 
DCEO and HTI; and

          WHEREAS, HTI desires to obtain Three Million Five 
Hundred Thousand Dollars ($3,500,000.00) of additional capital by 
selling to DCEO Five Hundred Thousand (500,000) unregistered 
shares of its common stock, par value $0.01 per share and DCEO 
desires to acquire the same, all subject to the terms and 
conditions of this Stock Purchase Agreement; and

          WHEREAS, certain HTI stockholders, DCEO and DUPONT 
are, simultaneously, with the execution of the Agreements, 
entering into a Shareholders' Agreement dated as of January 29, 
1997, among DCEO, DUPONT and the persons named in Attachment A 
thereto relative to their voting for DCEO's nominee to the HTI 
Board of Directors and to their future sales of shares of Common 
Stock of HTI (hereinafter referred to as the "Shareholders' 
Agreement").

          NOW, THEREFORE, in consideration of the respective 
agreements herein contained and subject to the terms and 
conditions set forth herein, the parties agree as follows:

                     ARTICLE I - DEFINITIONS

          The terms set forth below are defined by the section 
or article in which they are used in this Agreement and are 

<PAGE>


applicable also to the other Agreements referred to herein, as 
appropriate.

          "Affiliate"                            8.2(b)

          "Base Balance Sheet"                   4.4

          "Best knowledge of HTI"                4.17

          "Closing"                              3.1

          "Closing Date"                         2.2

          "Designated Persons"                   4.10(e)

          "Governmental Authority"               4.1

          "Intellectual Property Rights"         4.10(d)

          "Key Employees"                        4.12

          "Licenses"                             4.1(b)

          "Securities"                           7.5

          "Shareholders' Agreement"              5.1(e)

          "Shares"                               2.1

          "Standstill Agreement"                 5.1(f)

          Day" shall mean any day (other than a Saturday or 
Sunday) on which banks are generally open for business in the 
City of New York.

                 ARTICLE II - PURCHASE OF SHARES

2.1  SHARES SUBJECT TO PURCHASE

     In consideration of the issuance to DCEO of Five Hundred 
Thousand (500,000) shares of unregistered HTI Common Stock 
("Shares"), DCEO shall pay to HTI Three Million Five Hundred 
Thousand Dollars ($3,500,000.00).  The above payment shall be 
made by wiring the funds to an account designated in writing by 
HTI.

<PAGE>


                      ARTICLE III -CLOSING

3.1  CLOSING

     Subject to the terms and conditions of this Agreement, the 
closing (the "Closing") of the sale and purchase of the Shares is 
taking place upon the execution of this Agreement.

     (a)  HTI is delivering to DCEO and DUPONT (i) a duly 
executed copy of this Agreement; (ii) the Shares; (iii) a duly 
executed copy of the Standstill Agreement; (iv) a duly executed 
copy of the Registration Agreement; (v) a duly executed copy of 
the Shareholders' Agreement; (vi) duly executed copies of the 
Segment Marketing Agreement and the Reclamation Services 
Agreement; (vii) an opinion of counsel to HTI; and (viii) the 
Certificate of Incorporation, Bylaws, and resolutions of the 
Board of Directors of HTI authorizing the execution, delivery and 
performance of this Agreement, and each of the other documents 
being executed and delivered by HTI in connection herewith, 
certified by the secretary of HTI.

     (b)  DUPONT and DCEO are delivering to HTI (i) the purchase 
price (via wire transfer); (ii) a duly executed copy of this 
Agreement; (iii) a duly executed copy of the Standstill 
Agreement; (iv) a duly executed copy of the Registration 
Agreement; (v) a duly executed copy of the Shareholders' 
Agreement; (vi) a duly executed copy of the Segment Marketing 
Agreement and the Reclamation Services Agreement; (vii) an 
opinion of counsel to DUPONT and DCEO; (viii) a Secretary's 
Certificate certifying the due authorization of the execution, 
delivery and performance of this Agreement and each of the other 
documents being executed and delivered by DCEO in connection 
herewith; and (ix) a Secretary's Certificate certifying the due 
authorization, delivery and performance of this Agreement and 
each of the other documents being executed and delivered by 
DUPONT in connection herewith.

   ARTICLE IV - REPRESENTATIONS AND WARRANTIES OF THE COMPANY 

     In order to induce DUPONT and DCEO to enter into this 
Agreement, the Company represents and warrants as follows: 

<PAGE>


4.1  ORGANIZATION AND CORPORATE POWER

     (a) The Company is a corporation duly organized, validly 
existing and in good standing under the laws of New York, and is 
qualified to do business as a foreign corporation in each 
jurisdiction in which such qualification is required, except 
where the failure to do so qualify would not have a material 
adverse effect on the Company ("Material Adverse Effect").  The 
Company has all required corporate power and authority to own its 
property, to carry on its business as presently conducted, to 
enter into and perform this Agreement and to carry out the 
transactions contemplated hereby.  The copies of the Certificate 
of Incorporation and Bylaws of the Company, as amended to date, 
which have been furnished to counsel for DUPONT and DCEO by the 
Company, are correct and complete at the date hereof.  The minute 
books of the Company are true and complete. No consent, approval, 
order, license, permit or authorization of, or registration, 
declaration or filing with, any governmental authority or any 
other person is required to be obtained or made by or with 
respect to the Company in connection with the Agreements or the 
consummation of the transactions contemplated thereby , except 
where the failure to obtain or make would not have a Material 
Adverse Effect on the Company.

     (b)  Except as provided in Schedule 4.1, the Company and 
its properties, assets, operations and business are in compliance 
in all material respects with all applicable statutes, laws, 
ordinances, rules and regulations of any court, administrative 
agency or commission or other governmental authority or 
instrumentality, domestic or foreign, of competent jurisdiction 
("Governmental Authority") and any filing requirements relating 
thereto, including laws and regulations relating to environmental 
requirements (such as requirements in respect of air, water and 
noise pollution).  The Company has obtained all permits, licenses 
and other authorizations ("Licenses") which are required with 
respect to the operation of its business and the ownership of its 
assets under federal, state, local and foreign laws, including 
laws relating to pollution or protection of the environment, 
except when the failure to obtain would not have a Material 
Adverse Effect on the Company, and the Company is in compliance 
in all material respects with all terms and conditions of such 
permits, licenses and authorizations.

4.2  AUTHORIZATION

     The Agreements and all documents and instruments executed 
pursuant hereto, are valid and binding obligations of the 

<PAGE>


Company, enforceable in accordance with their terms, subject to 
applicable bankruptcy, insolvency, reorganization, moratorium and 
other laws applicable to creditors' rights and remedies and to 
the exercise of judicial discretion in accordance with general 
principles of equity.  The execution, delivery and performance of 
the Agreements and the issuance of the Shares have been duly 
authorized by all necessary corporate action of the Company.

4.3  CAPITALIZATION

     (a)  The authorized and issued capital stock of the Company 
are as set forth in Schedule 4.3.  All of the presently 
outstanding shares of capital stock of the Company have been duly 
and validly authorized and issued and are fully paid and 
non-assessable.  The Shares, when and if issued and delivered as 
provided for herein, will be duly authorized, validly issued, 
fully paid and nonassessable and free and clear of all liens and 
encumbrances.

     (b)  Except as provided above or in said Schedule 4.3, the 
Company has not issued any other shares of its capital stock and 
there are no outstanding warrants, options or other rights to 
purchase or acquire any of such shares, nor any outstanding 
securities convertible into such shares or outstanding warrants, 
options or other rights to acquire any such convertible 
securities.  There are no preemptive rights with respect to the 
issuance or sale by the Company of the Company's capital stock. 
Except as disclosed in Schedule 4.3, there are no restrictions on 
the transfer of the Shares or the Common Stock held by the 
Stockholders Group (as defined in the Shareholders' Agreement) 
other than those arising from federal and state securities laws 
or under this Agreement or the Shareholders' Agreement.  The only 
subsidiaries of the Company are those set forth in Schedule 4.3, 
and the Company does not have any other investments in any other 
corporation, trust, partnership or business entity and is not a 
party to any joint venture.

     (c)  Other than as provided in Schedule 4.3, there are no 
outstanding rights (other than those of which have been 
satisfied) which permit the holder thereof to cause the Company 
to file a registration statement under the Securities Act or 
which permit the holder thereof to include securities of the 
Company in a registration statement filed by the Company under 
the Securities Act, and there are no outstanding agreements or 
other commitments which otherwise relate to the registration of 

<PAGE>


any securities of the Company under the Securities Act.  All 
securities of the Company heretofore issued and sold by the 
Company were issued and sold in compliance with all applicable 
Federal and state securities laws.  Assuming that the 
representations and warranties of DUPONT and DCEO set forth in 
Article VII are true and correct, the offering, issuance and sale 
of the Shares will be exempt from the registration requirements 
of the Securities Act. 

4.4  FINANCIAL STATEMENTS

     HTI has provided to DCEO its 1995 Annual Report on Form 
10-K, its quarterly report on Form 10-Q for the nine month period 
ended September 30, 1996, including an income statement and 
balance sheet for the nine month period ended September 30, 1996 
(the "Base Balance Sheet"), and such financial statements 
(including the notes thereto, if any contained in such reports) 
(i) are in accordance with the books and records of HTI; (ii) 
present fairly the financial position and results of operations 
of HTI as of the dates and for the periods indicated; and (iii) 
have been prepared in accordance with generally accepted 
accounting principles applied on a consistent basis (except as 
indicated therein).

4.5  ABSENCE OF UNDISCLOSED LIABILITIES

     Except as otherwise specifically disclosed in Schedule 4.5, 
the Company does not have any material accrued or contingent 
liability or liabilities arising out of any transaction or state 
of facts existing prior to the date hereof (whether such 
liability is accrued, to become due, contingent, or otherwise) 
other than liabilities incurred since said balance sheet in the 
ordinary course of business or in connection with this Agreement. 

4.6  ABSENCE OF CERTAIN DEVELOPMENTS

     Except as specifically disclosed in Schedule 4.6, since the 
date of the Base Balance Sheet, there has been (i) no material 
adverse change in the financial condition of the Company or in 
the assets, liabilities, properties or business of the Company, 
(ii) no declaration, setting aside or payment of any dividend or 
other distribution with respect to, or any direct or indirect 
redemption or acquisition of, any of the capital stock of the 
Company, (iii) no waiver of any material valuable right of the 
Company or the cancellation of any debt or claim held by the 

<PAGE>


Company, (iv) no loan by the Company to any officer, director, 
employee or stockholder of the Company, or any agreement or 
commitment therefor in excess of $15,000, (v) no increase, direct 
or indirect, in the compensation paid or payable to any officer, 
director, employee or agent of the Company which increase is in 
excess of an annual rate of $50,000, (vi) no material loss, 
destruction or damage to any property of the Company, whether or 
not insured, (vii) no material labor trouble involving the 
Company and no material change in the personnel of the Company or 
the terms and conditions of their employment, (viii) no 
acquisition or disposition of any assets (or any contract or 
arrangement therefor) nor any other transaction by the Company 
otherwise than for fair value in the ordinary course of business; 
and (ix) no change in the accounting methods, practices or 
policies followed by the Company or in the depreciation or 
amortization policies or rates theretofore adopted.

4.7  TITLE TO PROPERTIES

     The Company has good and marketable title to all of its 
properties and assets, subject to existing encumbrances.

4.8  TAX MATTERS

     Except as set forth in Schedule 4.8, all federal, state, 
county and local taxes due and payable by the Company have been 
paid.  There are no taxes due to any foreign jurisdictions.  The 
provisions for taxes on the Base Balance Sheet are sufficient for 
the payment of all accrued and unpaid federal, state, county and 
local taxes of the Company, whether or not assessed or disputed 
as of the date of the Base Balance Sheet.  There exist no unpaid 
assessments nor any basis for the assessment of additional 
federal income taxes on the Company for any fiscal period.  All 
federal, state, county or local income tax returns of the Company 
have either been filed, or valid unexpired extensions to the due 
dates have been obtained.  The income tax returns of HTI have 
never been audited by any federal, state, local or foreign 
authorities.  HTI has not waived any statute of limitations with 
respect to taxes and have not agreed to any extension of time 
with respect to any tax assessment or deficiency.

4.9  CONTRACTS AND COMMITMENTS

     (a)  Except as disclosed in Schedule 4.9, the Company is 
not a party to any contract, obligation or commitment which 

<PAGE>


involves a potential commitment by HTI in excess of $500,000 or 
which is otherwise material and not entered into in the ordinary 
course of business and is not obligated under any contract or 
agreement or subject to any charter restriction which presently 
materially adversely affects its business, properties, assets, 
prospects or financial condition.   The Company is not in default 
under any contract, obligation or commitment the consequences of 
which default would have a Material Adverse Effect on the 
Company.  All agreements terminable by a third party in the event 
the Company enters into this Agreement have been brought to 
DUPONT's attention.

     (b)  Except as set forth in Schedule 4.9, HTI is not a 
party to any material written or oral

          (a)  contract with any labor union;

          (b)  contract for the future purchase of fixed assets 
or for the future purchase of materials, supplies or equipment in 
excess of normal operating requirements;

          (c)  contract for the employment of any officer or 
director on a full-time basis or any contract with any person on 
a consulting basis;

          (d)  bonus, pension, profit-sharing, retirement, stock 
purchase, stock option, or similar plan;

          (e)  agreement or indenture relating to the borrowing 
of money or to the mortgaging, pledging or placement of a lien on 
any assets of HTI;

          (f)  guaranty of any obligation for borrowed money or 
otherwise;

          (g)  lease or agreement under which HTI is lessee of 
or holds or operates any property, real or personal, owned by any 
other party;

          (h)  lease or agreement under which HTI is lessor of 
or permits any third party to hold or operate any property, real 
or personal, owned or controlled by HTI;

<PAGE>


          (i)  agreement or other commitment under which HTI is 
obligated to pay any broker's fees, finder's fees or any such 
similar fees, to any third party in excess of $75,000 during the 
year ended December 31, 1996;

          (k)  contract, agreement or commitment under which HTI 
has issued, or may become obligated to issue, any shares of 
capital stock of HTI, or any warrants, options, convertible 
securities or other commitments pursuant to which HTI is or may 
become obligated to issue any shares of its capital stock; or any 
other contract, agreement, arrangement or understanding which is 
material to the business of HTI.  HTI has furnished to DUPONT 
true and correct copies of all such agreements and other 
documents requested by DUPONT or its authorized representatives.

4.10 PROPRIETARY RIGHTS

     (a)  HTI owns, possesses, has the exclusive or nonexclusive 
right, as the case may be, to use, or where useful or necessary, 
has made timely and proper application for, all Intellectual 
Property Rights (as defined in subsection (d) of this Section 
4.10) useful, necessary or required for the conduct of its 
business as presently conducted, and HTI has no reason to 
believe, and does not believe, that it will be unable to obtain 
on reasonable terms all Intellectual Property Rights useful, 
necessary or required for the conduct of its business.

     (b)  Except as set forth in Schedule 4.10, no royalties, 
honorariums or fees are payable by HTI to other persons by reason 
of the ownership or use of said Intellectual Property Rights.

     (c)  There is no pending or, to the best knowledge of HTI, 
threatened claim or litigation against HTI nor, to the best 
knowledge of HTI, does there exist any basis therefor, contesting 
the validity or right to use of any of the foregoing, nor has HTI 
received any notice that any of said Intellectual Property Rights 
or the operation of HTI's business conflicts, or will conflict, 
with the asserted rights of others, nor, to the best knowledge of 
HTI, does there exist any basis for any such conflict.  As used 
herein, the term "Intellectual Property Rights" means all 
industrial and intellectual property rights, including, without 
limitation, patents, patent applications, trademarks, trade 
names, fictitious or assumed names, service marks, copyrights, 
computer programs and other computer software, certificates of 
public convenience and necessity, franchises, licenses, trade 
secrets, proprietary processes and formulae.

<PAGE>


     (d)  To the best knowledge of HTI, no valid claim may be 
asserted by any third party against HTI, with respect to (i) the 
continued employment by, or association with, HTI of any of the 
present officers or employees of or consultants to (said 
directors, officers, employees and/or consultants being 
hereinafter collectively referred to as the "Designated Persons") 
or (ii) the use, in connection with any business presently 
conducted by HTI, by any of the Designated Persons of any 
information which HTI or any of the Designated Persons would be 
prohibited from using, in each case under any prior agreements, 
arrangements or other preexisting set of facts, including, 
without limitation, any such agreement or arrangement between any 
of the Designated Persons and any former employer of any of the 
Designated Persons (as the case may be), or any legal or 
equitable considerations applicable to, among other things, 
unfair competition, trade secrets or proprietary information.

4.11 EFFECT OF TRANSACTIONS

     The execution, delivery and performance by the Company of 
this Agreement, the Shareholders' Agreement in the form set forth 
in Exhibit A, the Standstill Agreement in the form set forth in 
Exhibit B, and the Registration Agreement in the form set forth 
in Exhibit C will not conflict with or result in any default 
under any material contract, obligation or commitment of the 
Company, or any charter provision, bylaw or corporate restriction 
of the Company, or the creation of any lien, charge or 
encumbrance of any material nature upon any of the properties or 
assets of the Company, except pursuant to this Agreement.  The 
Company's execution and delivery of this Agreement and its 
performance of the transactions contemplated hereby will not 
violate any material instrument, agreement, judgment, decree, 
order, statute, rule or regulation of any Governmental Authority 
applicable to the Company. 

     4.12 LITIGATION

     Except as disclosed in Schedule 4.12, there is no material 
litigation or governmental proceeding or investigation pending 
or, to the best knowledge of the Company, threatened against the 
Company, which, individually or in the aggregate affects any of 
its properties or assets, or to the best knowledge of the 
Company, against any of the Company's Officers (collectively, the 
"Key Employees"), or which, individually or in the aggregate, if 
decided adversely to the Company or such Key Employee, would 

<PAGE>


invalidate, or materially hinder the enforceability or 
performance of this Agreement or any action taken or to be taken 
pursuant hereto.

4.13 STATE SECURITIES LAWS

     The Company has complied and will comply in all material 
respects with all applicable state "blue-sky" or securities laws 
in connection with the issuance and sale of its Common Stock 
heretofore and upon the closing of this Agreement. 

4.14 INFORMATION SUPPLIED TO DUPONT AND DCEO

     Neither this Agreement, the Form 10-K of the year ended 
December 31, 1995, the Form 10-Q for the quarter ended September 
30, 1996, nor any document, certificate, or written statement 
furnished to DUPONT or DCEO by the Company, contains as of the 
date hereof any untrue statement of a material fact, and none of 
this Agreement or such other documents, certificates and 
statements, omits to state a material fact necessary in order to 
make the statements contained herein or therein not misleading.

4.15 BROKERAGE

     There are no claims for brokerage commissions, finder's 
fees or similar compensation in connection with the transactions 
contemplated by this Agreement based on any arrangement or 
agreement made by or on behalf of the Company.

4.16 DEFINITION OF BEST KNOWLEDGE

     As used herein, the term "to the best knowledge of HTI" 
shall mean and include (a) actual knowledge of the executive 
officers of HTI and (b) that knowledge which a prudent 
businessperson could have obtained in the management of his or 
her business affairs after making due inquiry and exercising due 
diligence with respect thereto.  In connection therewith, the 
knowledge of any such executive officer of HTI shall be imputed 
to be the knowledge of HTI.  For purposes of this Agreement, 
disclosure of any matters in any Schedule shall be deemed 
disclosure for all purposes.

               ARTICLE V - CONDITIONS OF PURCHASE

5.1  CONDITIONS TO CLOSING

<PAGE>


     DCEO's obligation to purchase and pay for the Shares shall 
be subject to compliance by the Company with its agreements 
herein contained and to the fulfillment to DUPONT's satisfaction 
on or before and at the Closing of the following conditions: 

     (a)  Opinion of the Company Counsel.  DUPONT shall have 
received from counsel for the Company, Tenzer Greenblatt L.L.P., 
their opinion, dated the Closing Date.

     (b)  Authorization.  The Board of Directors of the Company 
shall have duly adopted resolutions in form reasonably 
satisfactory to DUPONT authorizing the Company to consummate the 
transactions contemplated hereby in accordance with the terms 
hereof, and DUPONT shall have received a duly executed 
certificate of the Secretary or an Assistant Secretary of the 
Company setting forth a copy of such resolutions and such other 
matters as may be requested by DUPONT. 

     (c)  Shareholders' Agreement.  The Company, DCEO, DUPONT, 
and certain stockholders of the Company shall have executed and 
delivered a Shareholders' Agreement in the form of Exhibit A 
hereto.
     (d)  Standstill Agreement.  The Company, DCEO, and DUPONT 
shall have executed and delivered a Standstill Agreement in the 
form of Exhibit B hereto.

     (e)  Registration Agreement.  The Company and DCEO shall 
have executed and delivered a Registration Agreement in the form 
of Exhibit C hereto.

     (f)  All Proceedings Satisfactory.  All corporate and other 
proceedings taken prior to or at the Closing in connection with 
the transactions contemplated by this Agreement, and all 
documents and evidences incident thereto, shall be reasonably 
satisfactory in form and substance to DUPONT, and DUPONT shall 
receive such copies thereof.  The issuance and sale of the Shares 
to DCEO shall be made in conformity with all applicable state and 
federal securities laws. 

              ARTICLE VI - COVENANTS OF THE COMPANY

     The Company shall comply, and the Company shall cause any 
direct or indirect subsidiaries of the Company to comply, with 
the following covenants, except as shall otherwise be expressly 

<PAGE>


agreed pursuant to a written consent executed by DUPONT.  All 
references to "the Company" in this Article VI shall be deemed to 
refer to the Company and its direct and indirect subsidiaries, if 
applicable, on a consolidated basis.

6.1  USE OF PROCEEDS

     The proceeds received by the Company hereunder shall be 
used by the Company to reduce existing operating lines of credit, 
finance working capital and to redeem outstanding convertible 
notes and debentures.

6.2  REGISTRATION RIGHTS

     All Shares purchased by DCEO under this Agreement shall be 
subject to registration rights in accordance with the 
Registration Agreement set forth in Exhibit C.

6.3  EXCHANGE, TRANSFER AND REPLACEMENT OF SHARE CERTIFICATES

     Upon surrender of any certificate representing Shares for 
exchange or transfer at the offices of the Company, the Company 
shall, at its expense (exclusive of applicable transfer taxes), 
issue in exchange therefor new certificates in such denomination 
or denominations as may be requested for the same aggregate 
number of Common Shares represented by the certificate so 
surrendered and registered as may be requested.  Upon receipt of 
evidence reasonably satisfactory to the Company of the loss, 
theft, destruction or mutilation of any certificate representing 
Common Shares and, in the case of any such loss, theft or 
destruction, upon delivery of an agreement of indemnity, and if 
required such other instruments or security bond, reasonably 
satisfactory to the Company and its Transfer Agent, or, in the 
case of any such mutilation, upon surrender and cancellation 
thereof, the Company shall, at its expense, issue a new 
certificate for the same aggregate number of Common Shares 
represented by such lost, stolen, destroyed or mutilated 
certificate, as the case may be.

        ARTICLE VII - REPRESENTATIONS OF DUPONT AND DCEO

     To induce the Company to execute this Agreement, DUPONT and 
DCEO hereby jointly and severally represent and warrant to, and 
covenants with, the Company with respect to DCEO's purchase of 
Shares hereunder, that: 

<PAGE>


7.1  AUTHORIZATION

     The Agreements and all documents and instruments executed 
pursuant hereto, are valid and binding obligations of each of 
DUPONT and DCEO, enforceable in accordance with their terms, 
subject to applicable bankruptcy, insolvency, reorganization, 
moratorium and other laws applicable to creditors' rights and 
remedies and to the exercise of judicial discretion in accordance 
with general principles of equity.  The execution, delivery and 
performance of the Agreements have been duly authorized by all 
necessary corporate action of each of DUPONT and DCEO.

7.2  EFFECT OF TRANSACTIONS

     The execution, delivery and performance by each of DUPONT 
and DCEO of this Agreement, the Shareholders' Agreement in the 
form set forth in Exhibit A, the Standstill Agreement in the form 
set forth in Exhibit B, and the Registration Agreement in the 
form set forth in Exhibit C will not conflict with or result in 
any default under any material contract, obligation or commitment 
of either DUPONT or DCEO, or any charter provision, bylaw or 
corporate restriction of either DUPONT or DCEO, or the creation 
of any lien, charge or encumbrance of any material nature upon 
any of the properties or assets of either DUPONT or DCEO. The 
execution and delivery of this Agreement by each of DUPONT and 
DCEO and their performance of the transactions contemplated 
hereby will not violate any material instrument, agreement, 
judgment, decree, order, statute, rule or regulation of any 
Governmental Authority applicable to either DUPONT or DCEO.

7.3  SECURITIES ACT

     (a)  The Shares to be purchased by DCEO pursuant to this 
Agreement are being acquired for investment purposes only and not 
with a view to any public distribution thereof, and it will not 
offer to sell or otherwise dispose of the Shares so acquired by 
it in violation of any of the registration requirements of the 
Securities Act of 1933, as amended.  The certificates evidencing 
the Shares will bear a legend reading substantially as follows:

               THE SECURITIES REPRESENTED BY THIS 
          CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE 
          SECURITIES ACT OF 1933 AND MAY NOT BE SOLD OR 
          TRANSFERRED EXCEPT IN COMPLIANCE WITH THAT ACT.  

<PAGE>


          THE SECURITIES REPRESENTED BY THIS CERTIFICATE 
          ARE SUBJECT TO THE PROVISIONS OF A PURCHASE 
          AGREEMENT DATED AS OF JANUARY 29, 1997, BETWEEN 
          HUDSON TECHNOLOGIES, INC. (THE "COMPANY") AND 
          CERTAIN SHAREHOLDERS OF THE COMPANY AND A 
          STANDSTILL AGREEMENT DATED AS OF JANUARY 29, 
          1997, AMONG THE COMPANY AND CERTAIN 
          SHAREHOLDERS OF THE COMPANY, COPIES OF WHICH 
          ARE ON FILE AT THE PRINCIPAL EXECUTIVE OFFICES 
          OF THE COMPANY.

     (b)  DUPONT and DCEO each have substantial experience in 
business and financial matters and in making investments of the 
type contemplated by this Agreement and is capable of evaluating 
the merits and risks of its purchase of the Shares and is able to 
bear the economic risks of its investment.

     (c)  DUPONT and DCEO each have had an opportunity to 
discuss the Company's business, management and financial affairs, 
and the terms and conditions of the Shares with the Company's 
management and all such questions have been answered to the full 
satisfaction of DUPONT and DCEO.

     (d)  DUPONT and DCEO each are an entity that qualifies as 
an "accredited investor" within the meaning of Rule 5.01(a) of 
Regulation D under the Securities Act.

7.4  NO REGISTRATION

     (a)  DUPONT and DCEO have been advised that the Securities 
have not been and are not being registered under the Securities 
Act or under the "blue sky" laws of any jurisdiction and that the 
Company in issuing the Securities is relying upon, among other 
things, the representations and warranties of DUPONT and DCEO 
contained in this Article VII in concluding that each such 
issuance is a "private offering" and does not require compliance 
with the registration provisions of the Securities Act and 
applicable state securities laws.  

     (b)  Absent an effective registration statement under the 
Securities Act covering the disposition of the Shares or unless 
DCEO is entitled to have the restrictions imposed on the Shares 
removed pursuant to Section 7.4(d) hereof, DCEO will not sell, 
transfer, assign or otherwise dispose of any or all of the Shares 
without first providing the Company with an opinion of counsel 

<PAGE>


reasonably satisfactory in form and substance to counsel for the 
Company to the effect that such sale, transfer, assignment or 
other disposition will be exempt from the registration 
requirements of the Securities Act.

     (c)  DCEO consents to the Company's making a notation on 
its records or giving instructions to any transfer agent of the 
Shares in order to implement the restrictions on transfer of the 
Shares mentioned in this Section 7.4.

     (d)  Any legend endorsed on a certificate evidencing the 
Shares pursuant to Section 7.3 and 7.4 hereof and the stop 
transfer instructions and record notations with respect to such 
Shares shall be removed and the Company shall issue a certificate 
without such legend to the holder of such Shares if (i) such 
Shares are registered under the Securities Act, (ii) such Shares 
are sold under Rule 144(k) of the Commission under the Securities 
Act or (iii) such holder provides the Company with an opinion of 
counsel reasonably satisfactory in form and substance to counsel 
for the Company to the effect that a public sale or transfer of 
such Shares was made without registration under the Securities 
Act.

7.5  SECURITIES

     For purposes of this Article, the term "Securities" 
includes all securities issued hereunder or on account of 
ownership of or conversion of the Shares whether in connection 
with any stock dividend, stock split, recapitalization, merger, 
consolidation or otherwise.

                     ARTICLE VIII - GENERAL

8.1  AMENDMENTS, WAIVERS AND CONSENTS

     For the purposes of this Agreement and all agreements, 
documents and instruments executed pursuant hereto, except as 
otherwise specifically set forth herein or therein, no course of 
dealing between the Company and DUPONT or DCEO and no delay on 
the part of any party hereto in exercising any rights hereunder 
or thereunder shall operate as a waiver of the rights hereof and 
thereof.  No covenant or other provision hereof or thereof may be 
waived otherwise than by a written instrument signed by the party 
so waiving such covenant or other provision; provided, however, 
that except as otherwise provided herein or therein, changes in 

<PAGE>


or additions to, and any consents required by this Agreement may 
be made, and compliance with any term, covenant, condition or 
provision set forth herein may be omitted or waived (either 
generally or in a particular instance and either retroactively or 
prospectively) by a consent or consents in writing of DUPONT.  
Any amendment or waiver effected in accordance with this 
paragraph shall be binding upon DUPONT and DCEO and the Company.

8.2  SURVIVAL OF COVENANTS; ASSIGNABILITY OF RIGHTS

     (a)  All covenants, agreements, representations and 
warranties of the Company made herein and in the certificates, 
lists, exhibits, schedules or other written information delivered 
or furnished to DUPONT and DCEO in connection herewith shall be 
deemed material and to have been relied upon by DUPONT and DCEO, 
and, except as provided otherwise in this Agreement, shall 
survive the delivery of the Shares for a period of nine months, 
and shall bind the Company's successors and assigns, whether so 
expressed or not, and, except as provided otherwise in this 
Agreement, all such covenants, agreements, representations and 
warranties shall inure to the benefit of DCEO's successors and 
assigns and to transferees of the Securities, whether so 
expressed or not.

     (b)  This Agreement and the rights hereunder shall not be 
assignable or transferable by DUPONT or DCEO or the Company 
(except by operation of law in connection with a merger, 
consolidation or other reorganization or sale of all or 
substantially all the assets of DUPONT, DCEO or the Company) 
without the prior written consent of the other party hereto; 
provided that DUPONT or DCEO may assign, in its sole discretion, 
any or all of its rights, interests and obligations under this 
Agreement to any of DUPONT's more than 50% owned subsidiaries 
("Affiliates") or to any transferee of the Shares.  Subject to 
the preceding sentence, this Agreement shall be binding upon, 
inure to the benefit of and be enforceable by the parties hereto 
and their respective successors and assigns.  The assignment by 
DUPONT or DCEO of any rights, interest or obligations under this 
Agreement to any transferee of the Shares acquired hereunder 
shall not affect or diminish the rights or obligations of DUPONT 
or DCEO under this Agreement.

<PAGE>


8.3  GOVERNING LAW

     The enforcement of this Agreement shall be governed by, and 
in connection with such enforcement this Agreement shall be 
construed in accordance with, the laws of the State of Delaware.

8.4  SECTION HEADINGS

     The descriptive headings in this Agreement have been 
inserted for convenience only and shall not be deemed to limit or 
otherwise affect the construction of any provision thereof or 
hereof. 

8.5  PUBLICITY

     The Company and DUPONT agree that (a) no public release or 
announcement concerning the transactions contemplated hereby 
shall be issued by any party hereto without the prior consent of 
the other party, except as such release or announcement may be 
required by law or the rules or regulations of any securities 
exchange, in which case the party required to make the release or 
announcement shall allow the other party reasonable time to 
comment on such release or announcement in advance of such 
issuance and (b) without the prior consent of DUPONT, the Company 
shall not issue any public release or announcement or issue or 
distribute any document to be used in connection with the private 
or public sale of debt or equity securities of the Company if 
such release, announcement or document refers to DCEO's 
investment in or contracts or other arrangements with the 
Company, except as may be required by law or the rules or 
regulations of any securities exchange or by any Governmental 
Authority, in which case the Company shall allow DUPONT 
reasonable time to comment on the relevant portions of such 
release, announcement or document.  

8.6  COUNTERPARTS

     This Agreement may be executed simultaneously in any number 
of counterparts, each of which when so executed and delivered 
shall be taken to be an original; but such counterparts shall 
together constitute but one and the same document. 

8.7  NOTICES

     All notices, requests, demands and other communications 
hereunder shall be in writing and shall be deemed given if 
delivered personally or mailed by certified or registered mail, 

<PAGE>


postage prepaid, return receipt requested, or delivered to a 
nationally recognized next business day courier for delivery on 
the next business day, or by facsimile, with a copy sent as 
aforesaid and in any instance addressed as follows:

         (i)   if to DUPONT

               E. I. Du Pont de Nemours and Company
               1007 Market Street
               Wilmington, DE  19898

               Attention:  Vice President and Treasurer

         (ii)  if to the Company

               Hudson Technologies, Inc.
               25 Torne Valley Road
               Hillburn, NY  10931-9900

               Attention:  President

         (iii) if to DCEO

               DuPont Building, Room 8045
               1007 Market Street
               Wilmington, DE  19898
          
               Attention:      Administrator - 
               Du Pont Chemical and Energy
               Operations, Inc.

or such other address as shall be furnished in writing by any of 
the parties, and any such notice or communication shall be deemed 
to have been given as of the date so delivered personally, so 
mailed, so delivered to the courier service, or so transmitted by 
telecopy (except that a notice of change of address shall not be 
deemed to have been given until received by the addressee).

8.8  SEVERABILITY

     Whenever possible, each provision of this Agreement shall 
be interpreted in such a manner as to be effective and valid 
under applicable law, but if any provision of this Agreement 
shall be deemed prohibited or invalid under such applicable law, 
such provision shall be ineffective to the extent of such 

<PAGE>


prohibition or invalidity, and such prohibition or invalidity 
shall not invalidate the remainder of such provision or the other 
provisions or this Agreement.

8.9  EXPENSES

     The Company shall pay all costs and expenses that it incurs 
with respect to the negotiation, execution, delivery and 
performance of this Agreement, and DUPONT and DCEO shall pay all 
costs and expenses that they incur with respect to the 
negotiation, execution, delivery and performance of this 
Agreement.

8.10 ENTIRE AGREEMENT

     This Agreement and the agreements referred to herein 
contain the entire agreement and understanding between the 
parties hereto with respect to the subject matter hereof and 
supersede all prior agreements and understandings relating to 
such subject matter

8.11 SPECIFIC ENFORCEMENT; INJUNCTIVE RELIEF

     The parties acknowledge that damages would be an inadequate 
remedy for any breach of the provisions of this Agreement.  
Therefore, the obligations of the parties hereunder shall be 
specifically enforceable and each of the parties agrees that each 
of them shall be entitled to an injunction, restraining order or 
other equitable relief from any court of competent jurisdiction, 
restraining any party from committing any violations of the 
provisions of this Agreement.

     IN WITNESS WHEREOF, the undersigned have executed this 
Agreement as a sealed instrument as of the day and year first 
above written. 

HUDSON TECHNOLOGIES, INC.

By  /s/ Kevin J. Zugibe
Title  President
Date  January 29, 1997

<PAGE>



E. I. DUPONT DE NEMOURS AND COMPANY

By  /s/ Mark E. Stookey
Title  Attorney-in-Fact
Date  January 29, 1997

DU PONT CHEMICAL AND ENERGY OPERATIONS, INC.

By  /s/ Mark D. Matthews
Title  Attorney-in-Fact
Date  January 29, 1997

<PAGE>


                                                        Exhibit C


                     SHAREHOLDERS' AGREEMENT
                    ------------------------

     This Shareholders' Agreement (the "Agreement") is made and 
entered into as of January 29, 1997, among HUDSON TECHNOLOGIES, 
INC. ("HTI"), E. I. DU PONT DE NEMOURS AND COMPANY ("DUPONT"), 
DU PONT CHEMICAL AND ENERGY OPERATIONS, INC. ("DCEO") and the 
persons named in Attachment A to this Shareholders' Agreement who 
have Beneficial Ownership of approximately twenty percent (20%) 
of the issued and outstanding Common Stock, par value $0.01 per 
share ("Common Stock") of HTI (hereafter the individuals named in 
Attachment A are referred to collectively as the Stockholders 
Group).

                      W I T N E S S E T H :

     HTI, DCEO and DUPONT are simultaneously herewith entering 
into a Stock Purchase Agreement, a Standstill Agreement, and a 
Registration Agreement, all of which are dated as of January 29, 
1997.

     Each member of the Stockholders Group is willing to execute 
this Shareholders' Agreement and to be bound by its provisions 
with respect to future sales of their shares of Common Stock and 
to voting for DUPONT's nominee for election to the Board of 
Directors of HTI.  It is a condition precedent to DUPONT entering 
into the Stock Purchase Agreement, the Standstill Agreement, and 
the Registration Agreement that this Shareholders' Agreement be 
signed by the parties hereto.  Each of the parties considers the 
provisions contained herein to be in the best interest of HTI.

     NOW, THEREFORE, in consideration of the respective 
agreements herein contained, the parties hereto agree as follows:

1.   DEFINITIONS

     For purposes of this Shareholders' Agreement:

     (a)  The term "Voting Securities" shall mean all classes of 
capital stock of HTI which are then entitled to vote generally in 
the election of directors or securities which do not carry the 
right to vote generally in the election of directors (including 

<PAGE>


convertible debt securities) but which may be exchanged, 
converted or exercised into a class of capital stock with such 
voting rights, and shall include Voting Securities owned 
contemporaneously with the date first above written or purchased 
subsequent to such date pursuant to stock options held on such 
date.

     (b)  The term "Beneficial Ownership" shall have the meaning 
set forth in Rule 13d-3(a) under the Securities Exchange Act of 
1934, as amended (the "1934 Act").

     (c)  The term "Control Disposition" shall mean a 
Disposition or a series of related Dispositions that would have 
the effect of transferring to any transferee or group (as defined 
for purposes of Section 13(d)(3) of the Securities Exchange Act 
of 1934, as amended, and the rules and regulations thereunder 
(the "Exchange Act")) of persons (a "Group") beneficial ownership 
(as defined in Rule 13d-3 of the Exchange Act ) of a number of 
shares of outstanding Voting Securities that, in the aggregate, 
exceeds (1) 5% of the outstanding shares of Voting Securities if, 
after giving effect to such proposed transfer, the proposed 
transferee or Group will have beneficial ownership, directly or 
indirectly, of 10% or more of the then outstanding shares of 
Voting Securities or (2) 10% of the then outstanding shares of 
Voting Securities.  "Control Disposition" shall not include the 
transfer of Voting Securities from one member of the Stockholder 
Group to another member of the Stockholder Group.

     (d)  The term "Disposition" shall mean any direct or 
indirect transfer, assignment, sale, gift, pledge, hypothecation, 
encumbrance or other disposition of Voting Securities (or any 
interest therein) or of all or part of the voting power (other 
than the granting of a revocable proxy) associated with the stock 
(or any interest therein) whatsoever, or any other transfer of 
beneficial ownership of Voting Securities, whether voluntary or 
involuntary, including, without limitation, any such disposition 
or transfer as a part of any liquidation of the holder's assets 
or any reorganization of a holder pursuant to the United States 
or any other bankruptcy law or other similar debtor relief laws.

     Each capitalized term not here defined shall have the 
meaning assigned to it by the provisions in which it is first 
used, or if not defined in this Agreement, the meaning assigned 
to it by the Stock Purchase Agreement.

<PAGE>


2.   TERM

     (a)  The effective date of this Shareholders' Agreement 
shall commence as of January 29, 1997, and shall terminate on 
January 29, 2002.  Notwithstanding the foregoing, this 
Shareholders' Agreement shall not become effective unless and 
until the Stock Purchase Agreement, the Standstill Agreement and 
the Registration Agreement have been signed by HTI, DUPONT and 
DCEO, and received by the other party.

     (b)  If prior to January 29, 2002, DUPONT and DCEO 
beneficially own a number of Voting Securities that represent 
less than 50% of the DuPont Voting Power (as defined in the 
Standstill Agreement) that DUPONT and DCEO held immediately after 
the Closing then this Shareholders' Agreement shall terminate at 
such time upon written notice by any of the parties hereto.

3.   ONE-YEAR PROHIBITION

     Except for Voting Securities offered for sale or transfer 
in accordance with the provisions of paragraph 4(f) hereof, no 
party to this Agreement shall, without the prior written consent 
of all other parties to this Agreement, sell, agree to sell, 
transfer or otherwise dispose of any Voting Securities until 
January 29, 1998; provided, that, the prohibitions of this 
Section 3 shall not apply to the sale and transfer of Voting 
Securities by such shareholder to an Affiliate of such 
shareholder if (in the case of an Affiliate that is not a party 
hereto) such Affiliate has furnished to the other parties hereto 
an undertaking, the performance of which is guaranteed by such 
shareholder, in form reasonably satisfactory to the other parties 
hereto, to be bound by the provisions of this Agreement.  Any 
purported disposition made in violation of this Section 3 shall 
be void.

4.   RIGHT OF FIRST REFUSAL

     Except for Voting Securities offered for sale or transfer 
in accordance with the provisions of paragraph 4(f) hereof, no 
member of the Stockholders Group and no agent or representative 
of any member of the Stockholders Group shall, directly or 
indirectly, offer, sell or transfer any Voting Securities without 
offering DUPONT the right of first refusal set forth in this 
Section 4 in the following manner:

<PAGE>


     (a)  Any member of the Stockholders Group intending to make 
such an offer, sale or transfer shall give notice (the "Transfer 
Notice") to DUPONT in writing of such intention, specifying the 
number of Voting Securities proposed to be disposed of and the 
proposed price therefor, and the specific offer to purchase such 
Voting Securities theretofore received and then remaining open, 
identifying the offeror and setting forth all the terms of such 
offer (including price).  For purposes hereof, a bona fide 
third-party tender or exchange offer pursuant of Regulation 14D 
of the 1934 Act to purchase Voting Securities shall be deemed to 
be an offer at the price specified therein, without regard to any 
provisions thereof with respect to proration or conditions to the 
offeror's obligation to purchase.  In the event the Transfer 
Notice specifies Voting Securities are intended to be sold into 
the public trading market, the "proposed price" per share for 
such sale shall be the average of the high and low price for one 
share of HTI Common Stock as reported on the National Association 
of Securities Dealers Automated Quotations System ("NASDAQ") on 
the last trading date immediately prior to the date that DUPONT 
provides such member of the Stockholders Group written notice of 
DUPONT's intent to exercise its right of first refusal with 
regard to such Voting Securities (the "Market Price"); provided, 
however, such member of the Stockholder Group shall have the 
right to withdraw such Transfer Notice, by written notice to 
DUPONT within two (2) business days following DUPONT's notice, if 
such Market Price is below the minimum acceptable Market Price 
(the "Floor Price") provided in the Transfer Notice; provided 
that, such Floor Price shall not be greater than the closing 
price as quoted on NASDAQ on the last trading day immediately 
prior to the date of the Transfer Notice; provided further, that 
any such Transfer Notice that does not specify a Floor Price 
shall be ineffective.

     (b)  DUPONT shall have the right, exercisable by written 
notice given by DUPONT to the member of the Stockholders Group 
who gave the Transfer Notice within thirty (30) days after 
receipt of such Transfer Notice (the "Regular Notice Period") (or 
in the case of a cash tender or exchange offer pursuant to 
Regulation 14D of the 1934 Act, no later than 24 hours prior to 
the latest time by which Voting Securities must be tendered in 
order to be accepted pursuant to such offer or to qualify for any 
proration applicable to such offer; provided that the Transfer 
Notice is received by DUPONT no later than five (5) business days 
after the tender offer materials have been received by the member 
of the Stockholders Group who gave such Transfer Notice) to 

<PAGE>


exercise its right of first refusal to purchase (or to cause a 
corporation, entity, person or group designated by DUPONT to 
purchase) all, but not a part of, the Voting Securities specified 
in such Transfer Notice for cash at the price set forth therein; 
provided however, that such Regular Notice Period shall be 
reduced from thirty (30) days to fifteen (15) days (the 
"Accelerated Notice Period") for any Transfer Notice proposing to 
sell Voting Securities for a total purchase price in cash of less 
than $500,000 (which shall be determined, in the event the 
Transfer Notice specifies Voting Securities are intended to be 
sold into the public trading market, by multiplying the number of 
Voting Securities proposed to be sold times the Floor Price 
designated in the Transfer Notice); provided further, that there 
shall be no more than (1) one Accelerated Notice Period for any 
member of the Stockholder Group in any 12 month period.

     (c)  Except as set forth in Section 4(b) above, the 
following procedures shall be followed with respect to a Transfer 
Notice which includes any property other than cash:

          (i)  If the purchase price specified in the Transfer 
Notice includes any property other than cash, such purchase price 
shall be deemed to be the amount of any cash included in the 
purchase price plus the value (as jointly determined by DUPONT 
and the member of the Stockholders Group who gave such Transfer 
Notice or, in the event DUPONT and the member of the Stockholders 
Group who gave such Transfer Notice are unable to agree, by a 
nationally or regionally recognized investment banking or 
consulting firm (the "Property Valuation Firm"), which firm shall 
be selected by two other previously chosen nationally or 
regionally recognized investment banking or consulting firms, 
each of which was chosen by DUPONT and the member of the 
Stockholders Group who gave such Transfer Notice, respectively, 
of such other property included in such price.  DUPONT and the 
member of the Stockholders Group who gave the Transfer Notice 
shall share equally the expenses incurred by the Property 
Valuation Firm.

          (ii) DUPONT and the member of the Stockholders 
Group who gave such Transfer Notice shall use their best efforts 
to cause any determination of the value of any securities 
included in the purchase price to be made within three (3) 
business days after the date of delivery of the Transfer Notice.  
If DUPONT and the member of the Stockholders Group who gave such 
Transfer Notice are unable to agree upon the value of any such 

<PAGE>


securities within such three-day period, DUPONT and the member of 
the Stockholders Group who gave such Transfer Notice shall 
promptly (but in no event later than five (5) business days after 
the date of delivery of the Transfer Notice) cause the selection 
of the Property Valuation Firm whose determination, which shall 
be made within three (3) business days of its selection, shall be 
conclusive.

          (iii) DUPONT and the member of the Stockholders Group 
who gave such Transfer Notice shall use their best efforts to 
cause any determination of the value of property other than 
securities to be made within five (5) business days after the 
date of delivery of the Transfer Notice.  If DUPONT and the 
member of the Stockholders Group who gave such Transfer Notice 
are unable to agree upon a value within such five-day Period, 
DUPONT and the member of the Stockholders Group who gave such 
Transfer Notice shall promptly (but in no event later than seven 
(7) business days after the date of delivery of the Transfer 
Notice) cause the selection of the Property Valuation Firm whose 
determination, which shall be made within five (5) business days 
of its selection, shall be conclusive.

          (iv) If the above process to determine the value of 
the other non-cash property is not completed within fifteen 
calendar days of the date of the Transfer Notice, then DUPONT's 
exercise of its right of first refusal shall be extended until 
fifteen (15) calendar days after the value of such other non-cash 
property is determined as provided for in paragraphs 4(c)(ii) and 
4(c)(iii) above.

     (d)  If DUPONT exercises its right of first refusal 
hereunder, the closing of the purchase of the Voting Securities 
with respect to which such right has been exercised shall take 
place within thirty (30) calendar days after DUPONT gives notice 
of such exercise, or within twenty (20) calendar days after 
DUPONT has obtained any necessary government approval or 
nonobjection, if any, whichever is later.  DUPONT shall make 
application for any necessary government approval as soon as 
practicable after exercising its right of first refusal.  Upon 
exercise of its right of first refusal, DUPONT shall not be 
legally obligated to consummate the purchase contemplated 
thereby, unless and until any such necessary government approvals 
are received.

<PAGE>


     (e)  If DUPONT does not exercise its right of first refusal 
hereunder within the time specified for such exercise, the party 
giving the Transfer Notice shall be free during the period of 
ninety (90) calendar days following the expiration of such time 
for exercise to sell the Voting Securities specified in such 
Transfer Notice to the offeror identified therein at the price 
specified therein or at any price in excess thereof.  With regard 
to any Transfer Notice specifying the sale of Voting Securities 
into the public trading market, such party shall be free during 
such 90-day period to sell the Voting Securities specified in 
such Transfer Notice into such public trading market at any price 
greater than or equal to the Floor Price specified in the 
Transfer Notice.  If such party shall not have completed such 
transfer within such 90-day period, the restrictions on transfer 
imposed by this Section 4 shall again apply to any proposed 
transfer of such Voting Securities.

     (f)  No member of the Stockholders Group shall, directly or 
indirectly, offer, sell or transfer any Voting Securities without 
offering DUPONT a right of first refusal in the manner provided 
in Section 4 except (i) to another member of the Stockholders 
Group, (ii) in a bona fide public offering registered under the 
Act (provided that no sales of Voting Securities are made to any 
person or related group of persons who would immediately 
thereafter, to the knowledge of any member of the Stockholders 
Group, have Beneficial Ownership of, or have the right to acquire 
Beneficial Ownership of, Voting Securities representing more than 
five percent (5%) of the total combined voting power of all 
Voting Securities then outstanding), (iii) pursuant to Rule 144 
under the Act (provided that no sales of Voting Securities are 
made to any person or related group of persons who would 
immediately thereafter, to the knowledge of the selling member of 
the Stockholders Group, have Beneficial Ownership of, or have the 
right to acquire Beneficial Ownership of, Voting Securities 
representing more than five percent (5%) of the total combined 
voting power of all Voting Securities then outstanding), (iv) to 
a trust for the benefit of members of the Stockholders Group, 
their spouses and relatives (whether born or unborn), provided 
the trust becomes a party to this Shareholders' Agreement, or (v) 
to any beneficiary of the estate of any member of the 
Stockholder's Group provided that prior to receiving Beneficial 
Ownership of said Voting Securities the beneficiary becomes a 
party to this Shareholders' Agreement; provided, however, that 
with regard to clauses (ii) and (iii) any such sales by a member 
of the Stockholders Group shall not exceed: (a) 25,000 shares of 

<PAGE>


Voting Securities in the initial 12 month period of the term of 
this Agreement, (b) 50,000 shares of Voting Securities in the 
initial 24 month period of the term of this Agreement, (c) 75,000 
shares of Voting Securities in the initial 36 month period of the 
term of this Agreement or (d) 100,000 shares of Voting Securities 
during the term of this Agreement.

     For purposes of (ii) and (iii) above, the seller or donor, 
as the case may be, his counsel and HTI's transfer agent shall be 
entitled to rely on a written representation from the person 
purchasing or receiving the Voting Securities to the effect that 
neither such person, nor any related group of persons, 
immediately after receipt thereof, will have Beneficial Ownership 
of or the right to acquire Beneficial Ownership of Voting 
Securities representing more than five percent (5%) of the total 
combined voting power of all Voting Securities then outstanding.

     For purposes of this Shareholders' Agreement, the term 
"related group of persons" means persons acting in concert with 
each other as to HTI and its Voting Securities.

5.   CONTROL DISPOSITION

     Notwithstanding anything herein to the contrary, no member 
of the Stockholder Group shall make or participate in any Control 
Disposition without first complying with Sections 3 and 4.  Any 
member of the Stockholder Group desiring to make or participate 
in a Control Disposition ("Control Offeror"), after complying 
with Sections 3 and 4, shall give a written notice ("Control 
Disposition Offer") to all other holders of outstanding Common 
Stock who are parties to this Agreement ("Control Offerees") (1) 
describing the proposed Control Disposition and the proposed 
transferee in reasonable detail and setting forth the number of 
shares to Stock as to which the Control Offeror desires to make a 
Control Disposition and (2) providing each Control Offeree with 
the right to elect (by written notice to the Company within ten 
(10) days after the receipt of the Control Disposition Offer) to 
dispose of in the Control Disposition, at the same price and on 
the same terms that the beneficial ownership of the Control 
Offeror's Stock is to be transferred in the Control Disposition, 
any number of shares of the common stock of the Company held by 
such Control Offeree as determined in the sole discretion of the 
Control Offeree.

<PAGE>


6.   ELECTION OF DCEO NOMINEE(S)

     During the period that DCEO exercises its right to 
designate a person(s) for nomination to the HTI Board of 
Directors pursuant to Section 4 of the Standstill Agreement, each 
member of the Stockholders Group, individually, shall vote all 
the Voting Securities over which he has direct or indirect voting 
control for such nominee(s).

7.   MISCELLANEOUS

     (a)  DUPONT and the members of the Stockholders Group 
acknowledge and agree that irreparable damage would occur to 
DUPONT and to the members of the Stockholders Group in the event 
any of the provisions of this Shareholders' Agreement were not 
performed in accordance with their specific terms or were 
otherwise breached.  It is accordingly agreed that DUPONT and the 
members of the Stockholders Group shall be entitled to an 
injunction or injunctions to prevent breaches of the provisions 
of this Shareholders' Agreement and to enforce specifically the 
terms and provisions hereof in any court of the United States or 
any state thereof having jurisdiction, in addition to any other 
remedy to which they may be entitled at law or in equity.

     (b)  The members of the Stockholders' Group agree that HTI 
may enter a stop transfer order with the transfer agent or agents 
of Voting Securities prohibiting the transfer of Voting 
Securities other than in compliance with the requirements of this 
Shareholders' Agreement.

     (c)  Each member of the Stockholders' Group and HTI agree 
to take or cause to be taken such action as may be required to 
accomplish the intent of this Shareholders' Agreement and further 
agrees to provide DUPONT with such additional certificates, 
opinions, instruments or documents as DUPONT may reasonably 
request to accomplish the intent of the transactions contemplated 
by this Shareholders' Agreement.

     (d)  This Shareholders' Agreement shall be binding on the 
successors, assigns, donees, heirs, distributees, beneficiaries, 
devisees and legatees of each member of the Stockholders Group, 
except for permitted sales, transfers and assignments under 
Section 4 hereof.

<PAGE>


     (e)  This Shareholders' Agreement and the attachments 
hereto contain the entire understanding of the parties with 
respect to the transactions contemplated herein, and this 
Shareholders' Agreement may be amended only by an agreement in 
writing executed by the parties hereto.

     (f)  All notices, requests, demands and other 
communications hereunder shall be in writing and shall be deemed 
given if delivered personally or mailed by certified or 
registered mail, postage prepaid, return receipt requested, or 
delivered to a nationally recognized next business day courier 
for delivery on the next business day, or by facsimile, with a 
copy sent as aforesaid and in any instance addressed as follows:

     If to Company:

          Hudson Technologies, Inc.
          25 Torne Valley Road
          Hillburn, New York  10931-9900

     If to DUPONT:

          E. I. du Pont de Nemours and Company
          1007 Market Street
          Wilmington, Delaware 19898
          Attention:  Vice President and Treasurer

     If to DCEO:

          Du Pont Chemical and Energy Operations, Inc.
          DuPont Building, Room 8045
          1007 Market Street
          Wilmington, Delaware  19898
          Attention:  Administrator

     If to any member of the Stockholder's Group:


or such other address as shall be furnished in writing by any of 
the parties, and any such notice or communication shall be deemed 
to have been given as of the date so delivered personally, so 
mailed, so delivered to the courier service, or so transmitted by 
telecopy (except that a notice of change of address shall not be 
deemed to have been given until received by the addressee).

<PAGE>


     (g)  This Agreement shall be governed by and construed and 
enforced in accordance with the laws of the State of Delaware 
applicable to contracts made and to be performed therein.

     IN WITNESS WHEREOF, DUPONT, DCEO, HTI and the members of 
the Stockholders Group have caused this Agreement to be duly 
executed all as of the day and year first above written.

E. I. DUPONT DE NEMOURS AND COMPANY

By  /s/ Mark E. Stookey
Name: Mark E. Stookey
Title:  Attorney-in-Fact

DU PONT CHEMICAL AND ENERGY OPERATIONS, INC.

By  /s/ Mark D. Matthews
Name: Mark D. Matthews
Title:  Attorney-in-Fact

HUDSON TECHNOLOGIES, INC.

By  /s/ Kevin J. Zugibe
Name: Kevin J. Zugibe
Title:  President


THE STOCKHOLDER[S]
/s/ Frederick J. Zugibe            /s/ Stephen Mandracchia
/s/ Kevin J. Zugibe                /s/ Stephen Cole-Hatchard
/s/ Thomas P. Zugibe

<PAGE>

                                                     Attachment A

                     HTI STOCKHOLDERS GROUP

                            HTI Shares     HTI Options
                            ----------     -----------

Kevin J. Zugibe              234,000        115,000
Stephen J. Cole-Hatchard     233,000        100,000
Stephen P. Mandracchia       122,000        100,000
Thomas P. Zugibe             234,000        100,000
Frederick T. Zugibe          212,500         75,000
                             -------        -------
Total                      1,035,500        490,000
                           =========        =======


<PAGE>


                                                        Exhibit D

                      STANDSTILL AGREEMENT

     AGREEMENT dated as of January 29, 1997 between E. I. DU 
PONT DE NEMOURS AND COMPANY, a Delaware corporation ("DuPont"), 
DU PONT CHEMICAL AND ENERGY OPERATIONS, INC., a Delaware 
corporation ("DCEO") and HUDSON TECHNOLOGIES, INC., a New York 
Corporation (the "Company").

     DCEO has acquired pursuant to a Stock Purchase Agreement 
with the Company dated January 29, 1997 (the "Stock Purchase 
Agreement") and currently owns an aggregate of 500,000 shares of 
the Common stock, par value $0.01 per share (such class of common 
stock being referred to herein as "Common Stock"), of the 
Company.  In order to establish a constructive and mutually 
beneficial relationship between DuPont, DCEO and the Company, the 
parties agree as follows:

1.   TERM OF AGREEMENT

     (a)  Except as otherwise expressly provided herein, the 
respective covenants and agreements of the parties contained in 
this Agreement will continue in full force and effect until 
January 29, 2002 (such date being referred to herein as the 
"Termination Date").

     (b)  If notice of termination is delivered by DuPont or 
DCEO or the Company as provided in paragraph 7(a), this Agreement 
shall terminate in its entirety on the date which is sixty days 
following such notice (such date being referred to herein as the 
"Termination Date"), but shall continue in full force and effect 
until the Termination Date except as otherwise provided herein.

     (c)  If this Agreement is terminated as provided in this 
paragraph, unless the Company otherwise agrees, DuPont and DCEO 
will cause all designees of DuPont or DCEO serving on the 
Company's Board of Directors pursuant to paragraph 4 to resign 
from such Board of Directors, effective as of the Termination 
Date.

<PAGE>


2.   COVENANTS OF DUPONT

     Prior to the Termination Date or earlier termination of 
this Agreement in accordance with its terms and subject to the 
further provisions hereof:

     (a)  Neither DuPont nor any corporation or other entity 
controlled by DuPont (collectively, the "DuPont Group") will, 
directly or indirectly, acquire any shares of any class of 
capital stock of the Company which is then entitled to vote 
generally in the election of directors (all such classes of 
capital stock of the Company being referred to herein as "Voting 
Securities") (except by way of stock dividends or other 
distributions or offerings made available to holders of Voting 
Securities generally) if the effect of such acquisition would be 
to increase the aggregate voting power in the election of 
directors of all Voting Securities then owned by all members of 
the DuPont Group (such aggregate voting power of all Voting 
Securities owned by all members of the DuPont Group being 
referred to herein as the "DuPont Voting Power") to greater than 
20% of the total combined voting power in the election of 
directors of all the Voting Securities then outstanding (such 
total combined voting power of all the Voting Securities 
outstanding being referred to herein as the "Total Voting 
Power"); provided that the DuPont Group may acquire Voting 
Securities without regard to the foregoing limitation if any of 
the following events (hereinafter referred to as "Triggering 
Events") shall occur:  (i) a tender or exchange offer is made by 
any person or 13D Group (as hereinafter defined) (other than an 
affiliate of, or any person acting in concert with, any member of 
the DuPont Group and other than a tender or exchange offer that 
is induced by any member of the DuPont Group) to acquire Voting 
Securities which, if added to the Voting Securities (if any) 
already owned by such person or 13D Group, would represent more 
than 20% of the Total Voting Power at such time, (ii) it is 
publicly disclosed or DuPont otherwise learns that Voting 
Securities representing more than 20% of the Total Voting Power 
have been acquired subsequent to January 1, 1997, or are proposed 
(in a public announcement or filing) to be acquired subsequent to 
such date by any person or 13D Group (other than an affiliate of, 
or any person acting in concert with, any member of the DuPont 
Group and other than any such acquisition or proposed acquisition 
of Voting Securities that has been induced, in whole or in part, 
by any member of the DuPont Group), or (iii) any person (not 
including any member of the Stockholders Group, as defined in the 
Stockholders Agreement as defined below) or 13D Group (not 
including affiliates or members of the DuPont Group and not 

<PAGE>


including any 13D Group comprised solely of the members of the 
Stockholders Group, as defined in the Shareholders Agreement as 
defined below) shall beneficially own Voting Securities 
representing a percentage of the Total Voting Power which exceeds 
the greater of (x) 10% or (y) the percentage of the Total Voting 
Power represented by the DuPont Voting Power at such time, and 
would be required (under rules and regulations in effect on 
January 29, 1997) to file a statement on Schedule 13D with the 
Securities and Exchange Commission reporting beneficial ownership 
of such Voting Securities, other than any such beneficial 
ownership that has been induced, in whole or in part, by any 
member of the DuPont Group or (iv) pursuant to its rights to 
purchase Voting Securities under the Shareholders Agreement 
between DCEO, DuPont, the Company and certain principal 
shareholders of the Company dated January 29, 1997 (the 
"Shareholders Agreement").  As used herein, the term "13D Group" 
shall mean any group of persons formed for the purpose of 
acquiring, holding, voting or disposing of Voting Securities 
which would be required under Section 13(d) of the Securities 
Exchange Act of 1934, as amended (the "Exchange Act"), and the 
rules and regulations thereunder (as in effect, and based on 
legal interpretations thereof existing, on January 29, 1997) to 
file a statement on Schedule 13D with the Securities and Exchange 
Commission as a "person" within the meaning of Section 13(d)(3) 
of the Exchange Act if such group beneficially owned Voting 
Securities representing more than 5% of any class of Voting 
Securities then outstanding.

     (b)  If at any time the DuPont Voting Power shall be 
increased to more than 20% of the Total Voting Power as a result 
of a repurchase of Voting Securities by the Company or any other 
change in the Company's capitalization, no member of the DuPont 
Group shall be required to dispose of any Voting Securities.

     (c)  As used herein, the term "Significant Event" means any 
charter or bylaw amendment, acquisition or disposition of assets 
(by way of merger, consolidation or otherwise), change in 
capitalization, liquidation, or other action out of the ordinary 
course of business of the Company.  

     (d)  The members of the DuPont Group, as holders of Voting 
Securities, shall be present, in person or by proxy, at all 
meetings of shareholders of the Company so that all Voting 
Securities beneficially owned by them may be counted for the 
purpose of determining the presence of a quorum at such meetings.

<PAGE>


     (e)  No member of the DuPont Group shall solicit proxies or 
become a "participant" in a "solicitation" (as such terms are 
defined in Regulation 14A under the Exchange Act, as in effect on 
January 29, 1997) in opposition to the recommendation of the 
majority of the directors of the Company with respect to any 
matter; provided that the limitation contained in this paragraph 
(e) shall not apply to any Significant Event to be voted on by 
the Company's shareholders that is not initiated or proposed by 
any member of the DuPont Group.

     (f)  No member of the DuPont Group shall join a 
partnership, limited partnership, syndicate or other group, or 
otherwise act in concert with any other person, for the purpose 
of acquiring, holding, voting or disposing of Voting Securities, 
or otherwise become a "person" within the meaning of Section 
13(d)(3) of the Exchange Act (in each case other than solely with 
members of the DuPont Group), except as to voting on specific 
matters as to which the DuPont Group is permitted to solicit 
proxies pursuant to the proviso of paragraph 2(e).

     (g)  No member of the DuPont Group shall, directly or 
indirectly, offer, sell or transfer any Voting Securities without 
offering the Company a right of first refusal in the manner 
provided in paragraph 5, except (i) to another member of the 
DuPont Group, (ii) pursuant to a bona fide public offering, 
registered under the Securities Act of 1933, as amended (the 
"Act"), of Voting Securities (provided that no sales of Voting 
Securities or securities exchangeable for Voting Securities are 
made to any person or related group of persons who would 
immediately thereafter, to the knowledge of any member of the 
DuPont Group, own or have the right to acquire Voting Securities 
representing more than 5% of the Total Voting Power) or (iii) 
pursuant to Rule 144 under the Act (provided that no sales of 
Voting Securities are made to any person or related group of 
persons who would immediately thereafter, to the knowledge of any 
member of the DuPont Group, own or have the right to acquire 
Voting Securities representing more than 5% of the Total Voting 
Power).

     For purposes of (ii) and (iii) above, DuPont, DuPont's 
counsel and HTI's transfer agent shall be entitled to rely on a 
written representation from the person purchasing or receiving 
the Voting Securities to the effect that neither such person, nor 
any related group of persons, immediately after receipt thereof, 

<PAGE>


will have Beneficial Ownership of or the right to acquire 
Beneficial Ownership of Voting Securities representing more than 
five percent (5%) of the total combined voting power of all 
Voting Securities then outstanding.

     For purposes of this Standstill Agreement, the term 
"related group of persons" means persons acting in concert with 
each other as to HTI and its Voting Securities.

3.   COVENANTS OF THE COMPANY

     (a)  Prior to the Termination Date or earlier termination 
of this Agreement in accordance with its terms and subject to the 
further provisions hereof without DuPont's written consent, the 
Company will not take or recommend to its shareholders any action 
during the term of this Agreement which would (1) impose 
limitations on the legal rights of the DuPont Group as Company 
shareholders other than those imposed pursuant to the express 
terms of this Agreement, including, without limitation, any 
action which would impose restrictions (i) based upon the size of 
security holding, nationality of a security holder, the business 
in which a security holder is engaged or other considerations 
applicable to the DuPont Group and not to security holders 
generally, or (ii) with reference to Common Stock generally, by 
means of the issuance of or proposal to issue any other class of 
securities having voting power disproportionately greater than 
the equity investment in the Company represented by such 
securities; (2) involve the issuance or corporate action 
providing for the issuance of any warrant, capital stock or other 
security or any other rights of which (including rights of 
redemption) are dependent upon the amount of Voting Securities 
owned by the DuPont Group; (3) deny any benefit to the members of 
the DuPont Group proportionately as holders of any class of 
Voting Securities that is made available to other holders of the 
same class of Voting Securities generally; or (4) alter voting or 
other rights of the holders of any class of Voting Securities so 
that any such rights (or the vote required with respect to any 
matter) are determined with reference to the amount of Voting 
Securities held by the DuPont Group; provided that the Company 
will cease to be subject to this paragraph 3(a) if a Triggering 
Event has occurred (other than pursuant to the rights of the 
DuPont Group to purchase Voting Securities pursuant to the 
Shareholders Agreement) and DuPont does not deliver to the 
Company, within five business days after becoming aware of such 
Triggering Event, a written waiver of the DuPont Group's right to 
acquire Voting Securities representing more than 20% of the Total 
Voting Power pursuant to the proviso of paragraph 2(a).

<PAGE>



     (b)  The Company will cease to be subject to paragraph 3(a) 
above at such time that the DuPont Group beneficially owns a 
number of Voting Securities that represents less than 50% of the 
DuPont Voting Power that the DuPont Group held immediately after 
the Closing.

4.   COVENANTS REGARDING BOARD REPRESENTATION

     (a)  As promptly as practicable after receipt of written 
notice from DCEO and DuPont, the Company will cause two persons 
designated by DCEO and DuPont to be elected to the Company's 
Board of Directors.  Such designation of any person for election 
to the Company's Board of Directors, or to attend Board meetings 
as an observer, shall be made after consultation with the 
Company, and any such person shall be a person agreed to by the 
Company (which agreement will not be unreasonably withheld).  At 
the time of any such designation, such designee will affirm his 
or her duty of confidentiality to the Company with regard to any 
non-public, confidential Company information through a 
confidentiality agreement reasonably satisfactory to the Company 
and DuPont.  Until the Termination Date or earlier termination of 
this Agreement in accordance with its terms, the Company's 
nominating committee shall recommend to the Company's Board of 
Directors that all persons designated by DCEO and DuPont for 
election to the Company's Board of Directors in accordance with 
the provisions of this paragraph (a) be included in the slate of 
nominees recommended by such Board to the Company's shareholders 
for election as directors at each annual meeting of the 
shareholders of the Company.  In the event that any designee of 
DCEO and DuPont for election to the Company's Board of Directors 
pursuant to the foregoing provisions shall cease to serve as a 
director for any reason, the vacancy resulting therefrom shall be 
filled according to the procedures described above.

     (b)  The Company will furnish to such designees on the 
Company's Board of Directors all information that is provided to 
the other directors of the Company. 

     (c)  At any time that the DuPont Group does not have two 
designees serving on the Board of Directors, DCEO and DuPont 
shall be entitled to designate a non-voting observer for each 
such Board seat and such observer(s) shall be entitled to attend 
all Board meetings.

<PAGE>



     (d)  It is the Company's policy to discuss with the Board 
of Directors any proposed merger, consolidation, reorganization 
or acquisition or disposition of material assets other than in 
the ordinary course of business and other transactions out of the 
ordinary course of business which would have a material impact on 
the Company's financial position or results of operations.  If in 
the future it should no longer be the Company's policy to present 
any such matters to the Board, then the Company will, during the 
term of this Agreement, discuss any such transactions with DuPont 
in advance.

     (e)  The parties acknowledge and agree that any director or 
observer nominated or designated by DCEO and DuPont will be under 
an obligation to DuPont not to disclose to any person outside of 
DuPont, or use in other than DuPont's business, any confidential 
information or material relating to the business of DuPont or its 
subsidiaries.  The parties acknowledge that there shall be no 
obligation on the part of such director or observer to disclose 
any such information or material to the Company, even if such 
disclosure would be of interest or value to the Company.

     (f)  The right of DCEO and DuPont to nominate up to two 
designees to be a director or observer shall terminate at such 
time that the DuPont Group beneficially owns a number of Voting 
Securities that represents less than 50% of the DuPont  Voting 
Power that the DuPont Group held immediately after the Closing.

5.   RIGHT OF FIRST REFUSAL

     To the extent required by paragraph 2(g), any member of the 
DuPont Group, prior to making any offer to sell, sale or transfer 
of Voting Securities, shall give the Company the opportunity to 
purchase such Voting Securities in the following manner:

     (a)  Any member of the DuPont Group intending to make such 
offer, sale or transfer shall give notice (the "Transfer Notice") 
to the Company in writing of such intention, specifying the 
number of Voting Securities proposed to be disposed of and the 
proposed price therefor, and the specific offer to purchase such 
Voting Securities theretofore received and then remaining open, 
identifying the offeror and setting forth all the terms of such 
offer (including price).  For purposes hereof a bona fide 
third-party tender or exchange offer to purchase Voting 
Securities shall be deemed to be an offer at the price specified 
therein, without regard to any provisions thereof with respect to 
proration or conditions to the offeror's obligation to purchase.

<PAGE>



     (b)  The Company shall have the right, exercisable by 
written notice given by the Company to DuPont within thirty (30) 
days after receipt of such Transfer Notice (or in the case of a 
tender or exchange offer, no later than 24 hours prior to the 
latest time by which Voting Securities must be tendered in order 
to be accepted pursuant to such offer or to qualify for any 
proration applicable to such offer, provided that the Transfer 
Notice is received by the Company no later than five (5) business 
days after the tender offer materials have been received by 
DuPont) to exercise its right of first refusal to purchase (or to 
cause a person or group designated by the Company to purchase) 
all, but not a part of, the Voting Securities specified in such 
Transfer Notice for cash at the price set forth therein.

     (c)  Except as set forth in Section 5(b) above, the 
following procedures shall be followed with respect to a Transfer 
Notice which includes any property other than cash:

          (i)   If the purchase price specified in the Transfer 
Notice includes any property other than cash, such purchase price 
shall be deemed to be the amount of any cash included in the 
purchase price plus the value (as jointly determined by the 
parties or, in the event the parties are unable to agree, by a 
nationally or regionally recognized investment banking or 
consulting firm (the "Property Valuation Firm"), which firm shall 
be selected by two other previously chosen nationally or 
regionally recognized investment banking or consulting firms, 
each of which was chosen by DuPont and the Company, respectively, 
of such other property included in such price. The parties shall 
share equally the expenses incurred by the Property Valuation 
Firm.

          (ii)  The parties shall use their best efforts to 
cause any determination of the value of any securities included 
in the purchase price to be made within three (3) business days 
after the date of delivery of the Transfer Notice.  If the 
parties are unable to agree upon the value of any such securities 
within such three-day period, the parties shall promptly (but in 
no event later than five (5) business days after the date of 
delivery of the Transfer Notice) cause the selection of the 
Property Valuation Firm whose determination, which shall be made 
within three (3) business days of its selection, shall be 
conclusive.

<PAGE>


          (iii) The parties shall use their best efforts to 
cause any determination of the value of property other than 
securities to be made within five (5) business days after the 
date of delivery of the Transfer Notice.  If the parties are 
unable to agree upon a value within such five-day period, the 
parties shall promptly (but in no event later than seven (7) 
business days after the date of delivery of the Transfer Notice) 
cause the selection of the Property Valuation Firm whose 
determination, which shall be made within five (5) business days 
of its selection, shall be conclusive.

          (iv)  If the above process to determine the value of 
the other non-cash property is not completed within 15 calendar 
days of the date of the Transfer Notice, then the Company's 
exercise of its right of first refusal shall be extended until 
fifteen (15) calendar days after the value of such other non-cash 
property is determined or provided for in paragraphs 5(c)(i) and 
5(c)(ii) above.

     (d)  If the Company exercises its right of first refusal 
hereunder, the closing of the purchase of the Voting Securities 
with respect to which such right has been exercised shall take 
place within 30 calendar days (or if approval of such purchase by 
the Company's shareholders is required by law or pursuant to any 
stock exchange rule or policy, within 90 calendar days) after the 
Company gives notice of such exercise.  Upon exercise of its 
right of first refusal, the Company shall use its best efforts to 
secure all approvals required in connection therewith.

     (e)  If the Company does not exercise its right of first 
refusal hereunder within the time specified for such exercise, 
the DuPont Group shall be free during the period of 90 calendar 
days following the expiration of such time for exercise to sell 
the Voting Securities specified in such Transfer Notice to the 
offeror identified therein at the price specified therein or at 
any price in excess thereof.  If the DuPont Group shall not have 
completed such transfer within such 90-day period, the 
restrictions or transfer imposed by this Section 4 shall again 
apply to any proposed transfer of such Voting Securities.

<PAGE>


6.   FURTHER UNDERSTANDINGS

     (a)  DuPont, DCEO and the Company shall use their best 
efforts to further the purposes of this Agreement and the spirit 
of cooperation which it evidences.  Each party will refrain from 
inducing or encouraging any other party to interfere with the 
relationships and rights created hereby.  The parties recognize 
that the foregoing provisions of this paragraph (a) cannot and 
should not be interpreted so as to restrict the ability of the 
Board of Directors of the Company to take such action as such 
Board may deem to be in the best interests of all the Company's 
shareholders, or the ability of the Board of Directors of DuPont 
to take such action as such Board may deem to be in the best 
interests of DuPont's shareholders.

     (b)  The Company and DuPont each agree to advise the other 
of any intention on the part of the Company or any member of the 
DuPont Group, as the case may be, to acquire outstanding Voting 
Securities of any class in order to insure that such acquisitions 
of Voting Securities will conform to all applicable legal 
requirements.

7.   TERMINATION

     (a)  Notwithstanding any other provision of this Agreement, 
either DuPont and DCEO or the Company may terminate this 
Agreement, in its sole discretion, if (i) the other party fails 
to perform or observe any of its obligations pursuant to this 
Agreement or (ii) DCEO's and DuPont's designees pursuant to 
paragraph 4 are not elected to the positions specified therein 
(except as provided for in paragraph 4(f)).  In addition, the 
Company shall have the right to terminate this Agreement, in its 
sole discretion, as provided in paragraph 8(b).

     (b) In the event of the termination of this Agreement 
pursuant to this paragraph 7, unless the parties otherwise agree, 
DCEO and DuPont will cause all its respective designees serving 
on the Board of Directors of the Company pursuant to paragraph 4 
to resign from such Board of Directors effective as of the date 
of such termination.

8.   MISCELLANEOUS

     (a)  DuPont, on the one hand, and the Company, on the 
other, acknowledge and agree that irreparable damage would occur 
in the event any of the provisions of this Agreement were not 

<PAGE>


performed in accordance with their specific terms or were 
otherwise breached.  It is accordingly agree that the parties 
shall be entitled to an injunction or injunctions to prevent 
breaches of the provisions of this Agreement and to enforce 
specifically the terms and provisions hereof in any court of the 
United States or any state thereof having jurisdiction, in 
addition to any other remedy to which they may be entitled at law 
or equity.

     (b)  If any provision of this Agreement is in violation of 
any statute, rule, regulation, order or decree of any 
governmental authority, court or agency, or subjects any member 
of the DuPont Group to governmental regulation to which it would 
not be subject except for such provision, then such member of the 
DuPont Group shall be relieved of its obligations under such 
provision to the minimum extent necessary to cure such violation 
or eliminate the applicability of such regulation; and provided 
further that in the event any member of the DuPont Group is 
relieved of its obligations under any provision of this Agreement 
pursuant to this paragraph, the Company may terminate this 
Agreement, in its sole discretion.

     (c)  If requested in writing by the Company, DuPont shall 
present or cause to be presented promptly all certificates 
representing Voting Securities now owned or hereafter acquired by 
members of the DuPont Group, for the placement thereon of the 
following legend, which will remain thereon as long as such 
Voting Securities are subject to the restrictions contained in 
this Agreement:

          THE SECURITIES REPRESENTED BY THIS CERTIFICATE 
     ARE SUBJECT TO THE PROVISIONS OF AN AGREEMENT DATED 
     AS OF JANUARY 29, 1997, BETWEEN E. I. DU PONT DE NEMOURS 
     AND COMPANY AND HUDSON TECHNOLOGIES, INC., AND MAY NOT 
     BE SOLD OR TRANSFERRED EXCEPT IN ACCORDANCE THEREWITH.  
     A COPY OF SAID AGREEMENT IS ON FILE AT THE OFFICE 
     OF THE CORPORATE SECRETARY OF HUDSON TECHNOLOGIES, INC.

The Company may enter a stop transfer order with the transfer 
agent or agents of Voting Securities against the transfer of 
Voting Securities except in compliance with the requirements of 
this Agreement.  The Company agrees to remove promptly any stop 
transfer order with respect to, and issue promptly unlegended 
certificates in substitution for, certificates for any Voting 
Securities that are no longer subject to the restrictions 
contained in this Agreement.

<PAGE>


     (d)  As used herein, the term "affiliate" shall have the 
meaning set forth in Rule 12b-2 under the Exchange Act (as in 
effect on January 29, 1997), and the term "person" shall mean any 
individual, partnership, corporation, trust or other entity.

     (e)  This Agreement, the Stock Purchase Agreement, the 
Shareholders Agreement and the Registration Agreement contain the 
entire understanding of the parties with respect to the 
transactions contemplated hereby and this Agreement may be 
amended only by an agreement in writing executed by the parties 
hereto.

     (f)  Descriptive headings are for convenience only and 
shall not control or affect the meaning or construction of any 
provision of this Agreement.

     (g)  For the convenience of the parties, any number of 
counterparts of this Agreement may be executed by the parties 
hereto and each such executed counterpart shall be deemed to be, 
an original instrument.

     (h)  All notices, requests, demands and other 
communications hereunder shall be in writing and shall be deemed 
given if delivered personally or mailed by certified or 
registered mail, postage prepaid, return receipt requested, or 
delivered to a nationally recognized next business day courier 
for delivery on the next business day, or by facsimile, with a 
copy sent as aforesaid and in any instance addressed as follows:

          THE COMPANY:
               Hudson Technologies, Inc.
               25 Torne Valley Road
               Hillburn, New York  10931-9900

               Attention:  President

          DUPONT:
               E. I. du Pont de Nemours and Company
               1007 Market Street
               Wilmington, Delaware  19898
               Attention:  Vice President and Treasurer 

<PAGE>


          DCEO:
               Du Pont Chemical and Energy Operations, Inc.
               DuPont Building, Room 8045
               1007 Market Street
               Wilmington, Delaware  19898
               Attention:     Administrator -- 
                  Du Pont Chemical and Energy Operations, Inc.

or such other address as shall be furnished in writing by any of 
the parties, and any such notice or communication shall be deemed 
to have been given as of the date so delivered personally, so 
mailed, so delivered to the courier service, or so transmitted by 
telecopy (except that a notice of change of address shall not be 
deemed to have been given until received by the addressee).

     (i)  From and after the Termination Date or earlier 
termination of this Agreement in accordance with its terms, the 
covenants of the parties set forth herein shall be of no further 
force or effect and the parties shall be under no further 
obligation with respect thereto.

     (j)  This Agreement shall be governed by and construed and 
enforced in accordance with the laws of the State of Delaware 
applicable to contracts made and to be performed therein.

     (k)  Each capitalized term not defined herein shall have 
the meaning assigned to it by the provisions in which it is first 
used, or if not defined in this Agreement, the meaning assigned 
to it by the Stock Purchase Agreement.

          IN WITNESS THEREOF, DuPont and the Company have caused 
this Agreement to be duly executed by their respective officers, 
each of whom is duly authorized, all as of the day and year first 
above written.

E. I. DUPONT DE NEMOURS AND COMPANY

By  /s/ Mark E. Stookey
Name: Mark E. Stookey
Title:  Attorney-in-Fact

DU PONT CHEMICAL AND ENERGY OPERATIONS, INC.

By  /s/ Mark D. Matthews
Name: Mark D. Matthews
Title:  Attorney-in-Fact

HUDSON TECHNOLOGIES, INC.

By  /s/ Kevin J. Zugibe
Name: Kevin J. Zugibe
Title:  President

<PAGE>


                                                        Exhibit E

                     REGISTRATION AGREEMENT

     This Registration Agreement (the "Registration Agreement") 
is made and entered into as of January 29, 1997, between DU PONT 
CHEMICAL AND ENERGY OPERATIONS, INC., a Delaware corporation 
("DCEO"), E. I. DU PONT DE NEMOURS AND COMPANY, a Delaware 
corporation ("DUPONT") and HUDSON TECHNOLOGIES, INC., a New York 
corporation ("HTI" or the "Company").

                      W I T N E S S E T H :

     WHEREAS, DCEO, DUPONT and HTI are, simultaneously with this 
Registration Agreement, entering into a certain Stock Purchase 
Agreement ("Stock Purchase Agreement") to provide a constructive 
and mutually beneficial relationship between HTI, DUPONT and 
DCEO, including the purchase of certain shares of Common Stock, 
par value $0.01 per share of HTI. 

     NOW, THEREFORE, in consideration of the respective 
agreements herein contained and in order to induce DCEO to enter 
into the Investment Agreement, the parties agree as follows: 

1.   DEMAND REGISTRATION

     (a)  The demand registration rights of DCEO set forth in 
Section 1 of this Registration Agreement may only be exercised by 
DCEO (i) anytime between January 29, 1999 and January 29, 2002, 
and (ii) only one (1) time, after which such demand registration 
rights shall terminate.

     (b)  Subject to Section l(a), in the event that HTI shall 
receive a written request from DCEO that HTI register under the 
Securities Act of 1933, as amended (the "Act") on Form S-3, or 
any other similar form then in effect, and provided that HTI is 
eligible to use such Form S-3, at least 500,000 Shares of Common 
Stock then owned by DCEO (the "Shares"), HTI agrees that it will 
use its best efforts to promptly file (but in no event more than 
forty-five (45) days after such request) a registration statement 
and to cause such registration statement to become effective as 
soon as practicable.  In the case of any registration pursuant to 
this Section 1 which involves a firm commitment underwritten 
public offering, the managing underwriter or underwriters shall 
be selected by DCEO and approved by HTI, which approval shall not 

<PAGE>


be unreasonably withheld, and HTI agrees to enter into an 
underwriting agreement in customary form with such underwriters.  
HTI will use its best efforts to cause any such registration to 
remain effective (with a prospectus at all times meeting the 
requirements of the Act) for 90 days from the effective date of 
the registration statement and will use its best efforts to 
effect such qualifications under applicable Blue Sky or other 
state securities laws as may be reasonably requested by DCEO 
(provided that HTI shall not be obligated to file a general 
consent to service of process or to qualify to do business as a 
foreign corporation or to otherwise subject itself to taxation 
solely for the purpose of any such qualification) to permit or 
facilitate such sale or other distribution.  Notwithstanding the 
above, the Company will not be obligated to undergo an audit of 
its financial statements other than in the ordinary course of its 
business.

     (c)  The Company may postpone for up to 60 days the filing 
or the effectiveness of a registration statement for a Demand 
Registration if the President of the Company delivers a written 
certificate to DCEO certifying that the Company's Board of 
Directors (evidenced by a resolution) has determined that public 
disclosure in a Registration Statement of certain information 
concerning the Company at that time would materially adversely 
affect the financial position or business of the Company; 
provided that in any such event, DCEO may withdraw such request 
and that, if such request is withdrawn, such request will not be 
deemed a Demand Registration.  The Company may only make one 
election in any 12-month period to postpone a Demand Registration 
pursuant hereto.

2.   PIGGYBACK REGISTRATION

     (a)  The piggyback registration rights of DCEO set forth in 
Section 2 of this Registration Agreement may be exercised by DCEO 
anytime between  January 29, 1998 and January 29, 2002.

     (b)  Subject to Section 2(a), if HTI shall take action to 
register any of its common stock for sale to the public for cash, 
it shall promptly give DCEO written notice of its intention so to 
do (such notice shall in no event be given later than five (5) 
business days after HTI and its underwriter have signed a letter 
of intent with respect to such offering) and shall use its best 
efforts to promptly file (but in no event more than forty-five 
(45) days after such request) a registration statement and to 

<PAGE>


cause such registration statement to become effective as soon as 
practicable including such number of the Shares held by DCEO as 
may be specified by written notice from DCEO delivered to HTI 
within fifteen (15) days after receiving the written notice by 
HTI of its intention to register; provided, however, that HTI 
shall not be required to honor any such request of DCEO unless 
such request involves registration of at least 100,000 Shares; 
provided, however, that if, in the written opinion of the 
Company's managing underwriter, if any, for such offering, the 
inclusion of all or a portion of the Shares requested to be 
registered will exceed the maximum amount of the Company's 
securities which can be marketed (i) at a price reasonably 
related to their then current market value, or (ii) without 
otherwise materially adversely affecting the entire offering, 
then (x) the Company may exclude from such offering all or a 
portion of the Shares which it has been requested to register or 
(y) if the underwriter so requests, such Shares shall not be sold 
until the expiration of 90 days from the effective date of the 
offering that gave rise to the piggyback registration rights that 
are the subject of this Section 2.

     (c)  Notwithstanding the provisions of this Section 2, the 
Company shall have the right at any time after it shall have 
given written notice pursuant to this Section 2 (irrespective of 
whether any written request for inclusion of Shares shall have 
already been made) to elect not to file any such proposed 
registration statement, or to withdraw the same after the filing 
but prior to the effective date thereof.

3.   PROSPECTUSES, DOCUMENTS, ETC.

     Upon making a request for demand registration pursuant to 
Section 1 hereof or for piggyback registration pursuant to 
Section 2 hereof, DUPONT shall furnish to HTI such information 
regarding DCEO's holdings and the proposed manner of distribution 
thereof as shall be reasonably required in connection with any 
registration, qualification or compliance referred to in such 
Sections, and shall otherwise reasonably cooperate with HTI in 
the preparation and filing of any registration statement, 
amendment or supplement required thereunder and in any efforts by 
HTI to establish any exemptions under federal and state 
securities laws.  HTI agrees that it will furnish to DUPONT the 
number of prospectuses, offering circulars or other documents, or 
any amendments or supplements thereto, incident to any 
registration, qualification or compliance referred to in Section 
1 hereof as DCEO from time to time may reasonably request. 

<PAGE>



4.   EXPENSES

     The obligations of HTI to register Shares held by DCEO 
shall be subject to the following terms and conditions:

     (a)  With respect to a demand registration, DUPONT shall 
pay all expenses of such registration, including (i) all 
underwriters' discounts and commissions, (ii) all expenses 
(including filing fees) incurred in connection with qualifying 
under state securities or Blue Sky laws, (iii) all other filing 
fees, (iv) the cost of any customary insurance policy that the 
underwriters may, in the exercise of their sole discretion, 
require in connection with such registration, (v) the reasonable 
fees of HTI's legal counsel, (vi) the fees of DUPONT's legal 
counsel, (vii) reasonable audit and other accounting fees and 
expenses, and (viii) printing costs (together the "Registration 
Costs"). 

     (b)  With respect to a piggyback registration, DUPONT shall 
pay its proportionate share of all expenses of such registration 
(the proportion to be the number of Shares being so registered at 
DUPONT's request as compared to the total number of shares of 
common stock being so registered), including (i) all 
underwriters' discounts and commissions in connection with the 
Shares sold by DCEO, (ii) its proportionate share of all expenses 
(including filing fees) incurred in connection with the 
qualifying under state securities or Blue Sky laws, except that 
with respect to any states requested by DUPONT and not the 
underwriters, DUPONT shall pay all expenses incurred in 
connection with qualifying under the state securities or Blue Sky 
laws of such states, (iii) its proportionate share of all other 
filing fees, (iv) its proportionate share of the fees of HTI's 
legal counsel, (v) all of the fees of DUPONT's legal counsel, 
(vi) its proportionate share of audit and other accounting fees 
and expenses, and (vii) its proportionate share of printing 
costs. 

5.   INDEMNIFICATION RELATING TO A REGISTRATION STATEMENT

     (a)  Whenever pursuant to Section 1 or Section 2 hereof a 
registration statement relating to Shares is filed under the Act, 
HTI will indemnify and hold harmless DUPONT and DCEO, each 

<PAGE>


underwriter of any such Shares and each person, if any, who 
controls any such underwriter, against any losses, claims, 
damages or liabilities, joint or several, to which DUPONT and 
DCEO, any such underwriter or any such controlling person may 
become subject under the Act or otherwise, including any amount 
paid in settlement of any litigation, commenced or threatened, if 
such settlement is effected with the written consent of HTI, and 
to reimburse them for all legal or other expenses reasonably 
incurred by them in connection with investigating or defending 
against such loss, claim, damage, or liability (or actions in 
respect thereof), insofar as such losses, claims, damages or 
liabilities (or actions in respect thereof) arise out of or are 
based upon any untrue statement or misrepresentation or alleged 
untrue statement of a material fact contained in such 
registration statement, or preliminary, final or summary 
prospectus contained therein, as may be amended or supplemented, 
or arise out of or are based upon the omission or alleged 
omission to state therein a material fact required to be stated 
therein or necessary in order to make the statements therein not 
misleading, unless such untrue statement or omission was made in 
such registration statement or final prospectus in reliance upon 
and in conformity with information furnished in writing to the 
Company in connection therewith by DUPONT or any such underwriter 
or any such person through DUPONT or the underwriter expressly 
for use therein; provided, however, that the indemnity agreement 
contained in this Section 5 with respect to any Preliminary 
Prospectus will not inure to the benefit of the underwriter (or 
to the benefit of any other person that may be indemnified 
pursuant to this Section 5 if (A) the person asserting any such 
losses, claims, damages, expenses or liabilities purchased the 
Shares which are the subject thereof from the underwriter or 
other indemnified person; (B) the underwriter or other 
indemnified person failed to send or give a copy of the 
Prospectus to such person at or prior to the written confirmation 
of the sale of such Shares to such person; and (C) the Prospectus 
did not contain any untrue statement or alleged untrue statement 
or omission or alleged omission giving rise to such cause, claim, 
damage, expense or liability.

     (b)  Whenever pursuant to Section 1 or 2 hereof a 
registration statement relating to Shares is filed under the Act, 
DUPONT and DUPONT's underwriter of the Shares to be registered 
and each person, if any, who controls any such underwriter (each 
such party being referred to severally in this subsection (b) as 
the "indemnifying party"), will jointly and severally indemnify 

<PAGE>


and hold harmless HTI, each of its directors, each of its 
officers and agents who have signed such registration statement 
(including consents) and each other person, if any, who controls 
HTI, in the same manner and to the same extent as set forth in 
subsection (a) of this Section 5, with respect to any untrue 
statement or alleged untrue statement of a material fact 
contained in such registration statement, or preliminary, final 
or summary prospectus contained therein, as may be amended or 
supplemented, or with respect to any omission or alleged omission 
to state therein a material fact required to be stated therein or 
necessary to make the statements therein not misleading, but only 
if, and to the extent that, such untrue statement, alleged untrue 
statement or omission or alleged omission was made in reliance 
upon and in conformity with written information furnished to HTI 
by an indemnifying party specifically for use in the preparation 
thereof.

     (c)  Promptly after receipt by an indemnified party under 
subsection (a) or (b) of this Section 5 of notice of the 
commencement of any action, such indemnified party will, if a 
claim in respect thereof is to be made against the indemnifying 
party under such clause, notify the indemnifying party in writing 
of the commencement thereof; but the omission so to notify the 
indemnifying party will not relieve the indemnifying party from 
any liability which it may have to any indemnified party 
otherwise than under such subsections.  In case any such action 
shall be brought against any indemnified party, and it shall 
notify the indemnifying party of the commencement thereof, the 
indemnifying party will be entitled to participate therein, and, 
jointly with any other indemnifying party similarly notified, to 
assume the defense thereof (unless such indemnified party 
reasonably objects to such assumption on the ground that there 
may be legal defenses available to it which are different from or 
in addition to those available to such indemnifying party) with 
counsel satisfactory to such indemnified party.  After such an 
assumption, the indemnifying party shall not be liable to such 
indemnified party under such subsection for any legal or other 
expenses subsequently incurred by such indemnified party in 
connection with the defense thereof other than reasonable costs 
of investigation. 

     (d)  For purposes of this Section 5 the terms "control", 
"controlling person" and "underwriter" have the meanings which 
they have in and under the Act. 

<PAGE>


6.   MISCELLANEOUS

     (a)  DUPONT, DCEO and HTI acknowledge and agree that 
irreparable damage would occur in the event any of the provisions 
of this Registration Agreement were not performed in accordance 
with their specific terms or were otherwise breached.  It is 
accordingly agreed that the parties shall be entitled to an 
injunction or injunctions to prevent breaches of the provisions 
of this Registration Agreement and to enforce specifically the 
terms and provisions hereof in any court of the United States or 
any State thereof having jurisdiction, in addition to any other 
remedy to which any of them may be entitled by law or equity. 

     (b)  All notices, consents, requests, instructions, 
approvals and other communications provided for herein and all 
legal process in regard hereto shall be validly given, made or 
served, if in writing and delivered or mailed as provided in the 
Stock Purchase Agreement. 

     (c)  This Registration Agreement, the Stock Purchase 
Agreement, the Shareholders' Agreement and the Standstill 
Agreement contain the entire understanding of the parties with 
respect to the transactions contemplated hereby and this 
Registration Agreement may be amended only by an agreement in 
writing executed by the parties hereto. 

     (d)  For the convenience of the parties, any number of 
counterparts of this Registration Agreement may be executed by 
the parties hereto and each such executed counterpart shall be, 
and shall be deemed to be, an original instrument. 

     (e)  Descriptive headings are for convenience only and 
shall not control or affect the meaning or construction of any 
provisions of this Registration Agreement. 

     (f)  This Registration Agreement shall be binding upon the 
respective successors and assigns of DUPONT, DCEO and HTI. 

     (g)  This Registration Agreement shall be governed by and 
construed in accordance with the laws of the State of Delaware 
applicable to contracts made and to be performed therein. 

     (h)  As used herein the term "person" shall mean any 
individual, partnership, corporation, trust or other entity.

<PAGE>


7.   DEFINITIONS

          Each capitalized term used and not otherwise defined 
herein shall have the meaning assigned to it by the Stock 
Purchase Agreement.

     IN WITNESS WHEREOF, DUPONT, DCEO and HTI have caused this 
Registration Agreement to be duly executed by their respective 
officers, each of whom is duly authorized, all as of the day and 
year first above written. 

               E. I. DUPONT DE NEMOURS AND COMPANY

               By  /s/ Mark E. Stookey
               Name: Mark E. Stookey
               Title:  Attorney-in-Fact

               DU PONT CHEMICAL AND ENERGY OPERATIONS, INC.

               By  /s/ Mark D. Matthews
               Name: Mark D. Matthews
               Title:  Attorney-in-Fact

                    HUDSON TECHNOLOGIES, INC.

                    By  /s/ Kevin J. Zugibe
                    Name: Kevin J. Zugibe
                    Title:  President




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