Exhibit 3.9

                            CERTIFICATE OF AMENDMENT

                                     OF THE

                          CERTIFICATE OF INCORPORATION

                                       OF

                            HUDSON TECHNOLOGIES, INC.

                Under Section 805 of the Business Corporation Law

The undersigned, being the Chairman and Chief Executive Officer of HUDSON
TECHNOLOGIES, INC., hereby certify:

1.The name of the corporation is HUDSON TECHNOLOGIES, INC. It was formed under
the name REFRIGERANT RECLAMATION INDUSTRIES, INC.

2. The Certificate of Incorporation was filed by the Department of State on
January 11, 1991.

3. The Certificate of Incorporation is amended as authorized by Section 801 of
the Business Corporation Law to increase the aggregate number of shares which
the corporation shall have authority to issue from 25,000,000, $.01 par value,
to 55,000,000, $.01 par value, and to designate all of the additional shares as
Common Stock. The amendment effected by this certificate of amendment is as
follows: the first paragraph of Article 5 of the Certificate of Incorporation,
which refers to the authorized shares of the corporation, is hereby amended to
read as follows:

      "(5). The total number of shares of capital stock which the Company shall
      have authority to issue is Fifty-Five Million (55,000,000) shares, of
      which Fifty Million (50,000,000) shares shall be Common Stock, par value
      $.01 per share, and Five Million (5,000,000) shares shall be Preferred
      Stock, par value $.01 per share."

4. The Certificate of Incorporation is further amended as authorized by Section
801 of the Business Corporation Law to change the provisions of the Series A
Preferred Stock relating to Voting and to adjustment of the Conversion Price.
The amendments effected by this certificate of amendment are as follows:

      (a) Section 4(a) of Article 5 of the Certificate of Incorporation is
deleted in its entirety and a new Section 4(a) is hereby inserted in lieu and
instead thereof to read as follows:

      "(a) General. In addition to any voting rights provided in the
      Corporation's Certificate of Incorporation or by law, the Series A
      Preferred Stock shall vote together with the Common Stock as a single
      class on all actions to be voted on by the stockholders of the
      Corporation. Each share of Series A Preferred Stock shall entitle the
      holder thereof to such number of votes per share on each such action as
      shall equal the number of shares of Common Stock (including fractions of a
      share) into which each share of Series A Preferred Stock is then
      convertible; provided, however, that, notwithstanding any other provision
      to the contrary herein, as the same relates solely to the voting rights of
      the Series A Preferred Stock as set forth in this Section 4, in
      determining the number of votes per share of Series A Preferred Stock, the
      Conversion Price shall be the higher of (a) the Conversion Price then in
      effect, or (b) $1.78. The holders of Series A Preferred Stock shall be
      entitled to notice of any stockholder's meeting in accordance with the
      By-Laws of the Corporation."

      (b) Section 5(d)(ii) of Article 5 of the Certificate of Incorporation is
      deleted in its entirety and a new Section 5(d) (ii) is hereby inserted in
      lieu and instead thereof to read as follows:



      "(ii) Issuance of Additional Shares of Stock. If the Corporation shall
      (except as hereinafter provided) issue or sell Additional Shares of Stock
      in exchange for consideration in an amount per Additional Share of Stock
      less than the Conversion Price in effect immediately prior to such
      issuance or sale of Additional Shares of Stock, then the Conversion Price
      as to the Common Stock into which the Series A Preferred Stock is
      convertible immediately prior to such adjustment shall be adjusted to
      equal the consideration paid per Additional Share of Stock. The provisions
      of this Section 5(d)(ii) shall not apply to any issuance of Additional
      Shares of Common Stock for which an adjustment is provided under Section
      5(d)(i) or which are dividends or distributions received by the holders of
      the Series A Preferred Stock pursuant to Section 2(b) hereof."

5. The amendments of the Certificate of Incorporation was authorized by the vote
of the members of the Board of Directors taken at a duly authorized meeting of
the Board of Directors, followed by the vote of the holders of a majority of the
outstanding shares entitled to vote thereon at a meeting of the shareholders.

IN WITNESS WHEREOF, I have hereunto executed this Certificate of Amendment this
3 rd day of January, 2003.

                                              HUDSON TECHNOLOGIES, INC.


                                              By: /s/ Kevin J. Zugibe
                                                  ------------------------------
                                                  Kevin J. Zugibe,
                                                  Chairman of the Board and
                                                  Chief Executive Officer



                            CERTIFICATE OF AMENDMENT

                                     OF THE

                          CERTIFICATE OF INCORPORATION

                                       OF

                            HUDSON TECHNOLOGIES, INC.

                Under Section 805 of the Business Corporation Law