Document:

GUARANTY AND SURETYSHIP AGREEMENT

 

THIS GUARANTY AND
SURETYSHIP AGREEMENT (this “Guaranty”) is made and entered into as of this 22th day of June, 2012, by HUDSON
TECHNOLOGIES, INC. (the “Guarantor”), with an address at One Blue Hill Plaza, Pearl River, NY 10965, in
consideration of the extension of credit by PNC BANK, NATIONAL ASSOCIATION  (the “PNC”), with an address
at PNC Bank Center, Two Tower Center, East Brunswick, New Jersey 08816, the various financial institutions named in the Loan Agreement
(as defined herein) or which hereafter become a party thereto (together with PNC collectively, “Lenders”), and
PNC as agent for Lenders (in such capacity, “Agent”), to HUDSON TECHNOLOGIES COMPANY (collectively, the
“Borrower”), and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged.

 

1. Guaranty of
Obligations. The Guarantor hereby unconditionally guarantees, and becomes surety for, the prompt payment and performance
of all loans, advances, debts, liabilities, obligations, covenants and duties owing by the Borrower to the Agent for the benefit
of the Lenders, any Lender or to any other direct or indirect subsidiary of the parent of any Lender, of any kind or nature, present
or future (including any interest accruing thereon after maturity, or after the filing of any petition in bankruptcy, or the commencement
of any insolvency, reorganization or like proceeding relating to the Borrower, whether or not a claim for post-filing or post-petition
interest is allowed in such proceeding), whether direct or indirect (including those acquired by assignment or participation),
absolute or contingent, joint or several, due or to become due, now existing or hereafter arising, whether or not (i) evidenced
by any note, guaranty or other instrument, (ii) arising under a certain Revolving Credit, Term Loan, Equipment Line of Credit and
Security Agreement dated the date hereof by and among the Borrower, the Agent and the Lenders, as may be amended, modified, restated
and/or replaced from time to time, (the “Loan Agreement”), any other agreement, instrument or document, (iii) for the
payment of money, (iv) arising by reason of an extension of credit, opening of a letter of credit, loan, equipment lease or guarantee,
(v) under any interest or currency swap, future, option or other interest rate protection or similar agreement, (vi) under or by
reason of any foreign currency transaction, forward, option or other similar transaction providing for the purchase of one currency
in exchange for the sale of another currency, or in any other manner, or (vii) arising out of overdrafts on deposit or other accounts
or out of electronic funds transfers (whether by wire transfer or through automated clearing houses or otherwise) or out of the
return unpaid of, or other failure of the Agent or Lenders to receive final payment for, any check, item, instrument, payment order
or other deposit or credit to a deposit or other account, or out of the Agent's or Lender’s non-receipt of or inability to
collect funds or otherwise not being made whole in connection with depository or other similar arrangements; and any amendments,
extensions, renewals and increases of or to any of the foregoing, and all costs and expenses of the Agent or Lenders incurred in
the documentation, negotiation, modification, enforcement, collection and otherwise in connection with any of the foregoing, including
reasonable attorneys' fees and expenses (hereinafter referred to collectively as the “Obligations”). If the
Borrower defaults under any such Obligations, the Guarantor will pay the amount due to the Agent for the benefit of the Lenders.

 

2.  Nature
of Guaranty; Waivers. This is a guaranty of payment and not of collection and the Agent shall not be required or obligated,
as a condition of the Guarantor's liability, to make any demand upon or to pursue any of its rights against the Borrower, or to
pursue any rights which may be available to it with respect to any other person who may be liable for the payment of the Obligations.

 

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This is an absolute,
unconditional, irrevocable and continuing guaranty and will remain in full force and effect until all of the Obligations have been
indefeasibly paid in full, and the Agent has terminated this Guaranty. This Guaranty will remain in full force and effect even
if there is no principal balance outstanding under the Obligations at a particular time or from time to time. This Guaranty will
not be affected by any surrender, exchange, acceptance, compromise or release by the Agent or any Lender of any other party, or
any other guaranty or any security held by it for any of the Obligations, by any failure of the Agent or any Lender to take any
steps to perfect or maintain its lien or security interest in or to preserve its rights to any security or other collateral for
any of the Obligations or any guaranty, or by any irregularity, unenforceability or invalidity of any of the Obligations or any
part thereof or any security or other guaranty thereof. The Guarantor's obligations hereunder shall not be affected, modified or
impaired by any counterclaim, set-off recoupment, deduction or defense based upon any claim the Guarantor may have (directly or
indirectly) against the Borrower or the Agent or any Lender, except payment or performance of the Obligations.

 

Notice of acceptance
of this Guaranty, notice of extensions of credit to the Borrower from time to time, notice of default, diligence, presentment,
notice of dishonor, protest, demand for payment, and any defense based upon the Agent's or any Lender’s failure to comply
with the notice requirements under Sections 9-611 and 9-612 of the Uniform Commercial Code as in effect from time to time are hereby
waived. The Guarantor waives all defenses based on suretyship or impairment of collateral.

 

The Agent or the Lenders
at any time and from time to time, without notice to or the consent of the Guarantor, and without impairing or releasing, discharging
or modifying the Guarantor's liabilities hereunder, may (a) change the manner, place, time or terms of payment or performance
of or interest rates on, or other terms relating to, any of the Obligations; (b) renew, substitute, modify, amend or alter,
or grant consents or waivers relating to any of the Obligations, any other guaranties, or any security for any Obligations or guaranties;
(c) apply any and all payments by whomever paid or however realized including any proceeds of any collateral, to any Obligations
of the Borrower in such order, manner and amount as the Agent or the Lenders may determine in its sole discretion; (d) settle,
compromise or deal with any other person, including the Borrower or the Guarantor, with respect to any Obligations in such manner
as the Agent or any Lender deems appropriate in its sole discretion; (e) substitute, exchange or release any security or guaranty;
or (f) take such actions and exercise such remedies hereunder as provided herein.

 

3.  Repayments
or Recovery from the Agent. If any demand is made at any time upon the Agent or the Lenders for the repayment or recovery
of any amount received by it in payment or on account of any of the Obligations and if the Agent or the Lenders repays all or any
part of such amount by reason of any judgment, decree or order of any court or administrative body or by reason of any settlement
or compromise of any such demand, the Guarantor will be and remain liable hereunder for the amount so repaid or recovered to the
same extent as if such amount had never been received originally by the Agent or such Lenders. The provisions of this section will
be and remain effective notwithstanding any contrary action which may have been taken by the Guarantor in reliance upon such payment,
and any such contrary action so taken will be without prejudice to the Agent's rights hereunder and will be deemed to have been
conditioned upon such payment having become final and irrevocable.

 

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4. Financial
Statements. Unless compliance is waived in writing by the Agent or until all of the Obligations have been paid in full,
the Guarantor will promptly submit such information relating to the Guarantor’s affairs as requested by the Agent from time
to time in it reasonable discretion.

 

5.  Enforceability
of Obligations.  No modification, limitation or discharge of the Obligations arising out of or by virtue of any
bankruptcy, reorganization or similar proceeding for relief of debtors under federal or state law will affect, modify, limit or
discharge the Guarantor's liability in any manner whatsoever and this Guaranty will remain and continue in full force and effect
and will be enforceable against the Guarantor to the same extent and with the same force and effect as if any such proceeding had
not been instituted. The Guarantor waives all rights and benefits which might accrue to it by reason of any such proceeding and
will be liable to the full extent hereunder, irrespective of any modification, limitation or discharge of the liability of the
Borrower that may result from any such proceeding.

 

The Guarantor expressly
waives other limitations on any actions under this Guaranty.

 

6.  Events
of Default. Any Event of Default (as defined in the Loan Agreement) shall constitute an “Event of Default”
hereunder. Upon the occurrence of any Event of Default, (a) the Guarantor shall pay to the Agent the amount of the Obligations
(exclusive of Obligations under any interest rate swap agreements with any Lenders or any of their affiliates, which shall be controlled
by such interest rate swap agreements); or (b) on demand of the Agent, the Guarantor shall
immediately deposit with the Agent, in U.S. dollars, all amounts due or to become due under the Obligations, and the Agent may
at any time use such funds to repay the Obligations; or (c) the Agent in its discretion may exercise with respect to any collateral
any one or more of the rights and remedies provided a secured party under the applicable version of the Uniform Commercial Code;
or (d) the Agent in its discretion may exercise from time to time any other rights and remedies available to it at law, in equity
or otherwise.

 

7. Right of Setoff.
In addition to all liens upon and rights of setoff against the Guarantor’s money, securities or other property given to the
Agent or to any Lenders by law, the Agent shall have, with respect to the Guarantor's obligations to the Agent under this Guaranty
and to the extent permitted by law, a contractual possessory security interest in and a contractual right of setoff against, and
the Guarantor hereby grants Agent a security interest in, and hereby assigns, conveys, delivers, pledges and transfers to the Agent
or to any Lenders all of the Guarantor's right, title and interest in and to, all of the Guarantor’s deposits, moneys, securities
and other property now or hereafter in the possession of or on deposit with, or in transit to, the Agent, any Lenders or any other
direct or indirect subsidiary of any parent of any Lender, whether held in a general or special account or deposit, whether held
jointly with someone else, or whether held for safekeeping or otherwise, excluding, however, all IRA, Keogh, and trust accounts.
Every such security interest and right of setoff may be exercised without demand upon or notice to the Guarantor. Every such right
of setoff shall be deemed to have been exercised immediately upon the occurrence of an Event of Default hereunder without any action
of the Agent, although the Agent may enter such setoff on its books and records at a later time.

 

8. Collateral.
This Guaranty is secured by the property described in the Loan Agreement and in any collateral security documents which the Guarantor
executes and delivers to the Agent and by such other collateral as previously may have been or may in the future be granted to
the Agent to secure any Obligations of the Guarantor to the Agent.

 

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9.  Costs.
To the extent that the Agent incurs any costs or expenses in protecting or enforcing its rights under the Obligations or this Guaranty,
including reasonable attorneys' fees and the costs and expenses of litigation, such costs and expenses will be due on demand, will
be included in the Obligations and will bear interest from the incurring or payment thereof at the Default Rate (as defined in
the Loan Agreement).

 

10. Postponement
of Subrogation. Until the Obligations are indefeasibly paid in full, expire, are terminated and are not subject to any
right of revocation or rescission, the Guarantor postpones and subordinates in favor of the Agent or its designee (and any assignee
or potential assignee) any and all rights which the Guarantor may have to (a) assert any claim whatsoever against the Borrower
based on subrogation, exoneration, reimbursement, or indemnity or any right of recourse to security for the Obligations with respect
to payments made hereunder, and (b) any realization on any property of the Borrower, including participation in any marshalling
of the Borrower's assets.

 

11. Notices.
All notices, demands, requests, consents, approvals and other communications required or permitted hereunder (“Notices”)
must be in writing and will be effective upon receipt. Notices may be given in any manner to which the Agent and the Guarantor
may separately agree, including electronic mail. Without limiting the foregoing, first-class mail, facsimile transmission and commercial
courier service are hereby agreed to as acceptable methods for giving Notices. Regardless of the manner in which provided, Notices
may be sent to addresses for the Agent and the Guarantor as set forth above or to such other address as either may give to the
other for such purpose in accordance with this section.

 

12.  Preservation
of Rights.  No delay or omission on the Agent's part to exercise any right or power arising hereunder will impair
any such right or power or be considered a waiver of any such right or power, nor will the Agent's action or inaction impair any
such right or power. The Agent's rights and remedies hereunder are cumulative and not exclusive of any other rights or remedies
which the Agent may have under other agreements, at law or in equity. The Agent may proceed in any order against the Borrower,
the Guarantor or any other obligor of, or collateral securing, the Obligations.

 

13. Illegality.
If any provision contained in this Guaranty should be invalid, illegal or unenforceable in any respect, it shall not affect or
impair the validity, legality and enforceability of the remaining provisions of this Guaranty.

 

14. Changes in
Writing. No modification, amendment or waiver of, or consent to any departure by the Guarantor from, any provision of this
Guaranty will be effective unless made in a writing signed by the Lenders, and then such waiver or consent shall be effective only
in the specific instance and for the purpose for which given. No notice to or demand on the Guarantor will entitle the Guarantor
to any other or further notice or demand in the same, similar or other circumstance.

 

15. Entire Agreement.
This Guaranty (including the documents and instruments referred to herein) constitutes the entire agreement and supersedes all
other prior agreements and understandings, both written and oral, between the Guarantor and the Agent with respect to the subject
matter hereof; provided, however, that this Guaranty is in addition to, and not in substitution for, any other guarantees from
the Guarantor to the Agent.

 

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16. Successors
and Assigns. This Guaranty will be binding upon and inure to the benefit of the Guarantor and the Agent and their respective
heirs, executors, administrators, successors and assigns as permitted by the Loan Agreement; provided, however, that
the Guarantor may not assign this Guaranty in whole or in part without the Agent's prior written consent and the Agent at any time
may assign this Guaranty in whole or in part.

 

17. Interpretation.
In this Guaranty, unless the Agent and the Guarantor otherwise agree in writing, the singular includes the plural and the plural
the singular; references to statutes are to be construed as including all statutory provisions consolidating, amending or replacing
the statute referred to; the word “or” shall be deemed to include “and/or”, the words “including”,
“includes” and “include” shall be deemed to be followed by the words “without limitation”;
and references to sections or exhibits are to those of this Guaranty. Section headings in this Guaranty are included for convenience
of reference only and shall not constitute a part of this Guaranty for any other purpose. If this Guaranty is executed by more
than one party as Guarantor, the obligations of such persons or entities will be joint and several. All capitalized terms not otherwise
defined herein shall have the definition ascribed to them in the Loan Agreement.

 

18. Indemnity.
The Guarantor agrees to indemnify each of the Lenders, each legal entity, if any, who controls any Lender and each of their respective
directors, officers and employees (the “Indemnified Parties”), and to hold each Indemnified Party harmless from
and against, any and all claims, damages, losses, liabilities and expenses (including all fees and charges of internal or external
counsel with whom any Indemnified Party may consult and all expenses of litigation and preparation therefor) which any Indemnified
Party may incur or which may be asserted against any Indemnified Party by any person, entity or governmental authority (including
any person or entity claiming derivatively on behalf of the Guarantor), in connection with or arising out of or relating to the
matters referred to in this Guaranty, whether (a) arising from or incurred in connection with any breach of a representation, warranty
or covenant by the Guarantor, or (b) arising out of or resulting from any suit, action, claim, proceeding or governmental investigation,
pending or threatened, whether based on statute, regulation or order, or tort, or contract or otherwise, before any court or governmental
authority; provided, however, that the foregoing indemnity agreement shall not apply to any claims, damages, losses,
liabilities and expenses solely attributable to an Indemnified Party's gross negligence or willful misconduct. The indemnity agreement
contained in this Section shall survive the termination of this Guaranty and assignment of any rights hereunder. The Guarantor
may participate at its expense in the defense of any such claim.

 

19. Governing
Law and Jurisdiction. This Guaranty has been delivered to and accepted by the Agent and will be deemed to be made in the
State of New York. This Guaranty will be interpreted and the rights and liabilities of
the Agent and the Guarantor determined in accordance with the laws of the State of New York, excluding its conflict of laws rules.
The Guarantor hereby irrevocably consents to the exclusive jurisdiction of any state or federal court in the county or judicial
district in the State of New York; provided that nothing contained in this Guaranty will prevent the Agent from bringing any action,
enforcing any award or judgment or exercising any rights against the Guarantor individually, against any security or against any
property of the Guarantor within any other county, state or other foreign or domestic jurisdiction. The Guarantor acknowledges
and agrees that the venue provided above is the most convenient forum for both the Agent and the Guarantor. The Guarantor waives
any objection to venue and any objection based on a more convenient forum in any action instituted under this Guaranty.

 

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20. Waiver
of Jury Trial. The Guarantor irrevocably waives any and all right the Guarantor may have to a trial by jury in any action,
proceeding or claim of any nature relating to this Guaranty, any documents executed in connection with this Guaranty or any transaction
contemplated in any of such documents. The Guarantor acknowledges that the foregoing waiver is knowing and voluntary.

 

[SIGNATURES
CONTAINED ON FOLLOWING PAGE]

 

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The Guarantor acknowledges
that it has read and understood all the provisions of this Guaranty, including the waiver of jury trial, and has been advised by
counsel as necessary or appropriate.

 

The due execution hereof
as of the date first written above, with the intent to be legally bound hereby.

 

	ATTEST:	 	HUDSON TECHNOLOGIES, INC.
	 	 	 	 	 
	By:	/s/ Stephen P. Mandracchia	 	By:	/s/ Brian F. Coleman
	Name:	Stephen P. Mandracchia	 	Name:	Brian F. Coleman
	Title:	Secretary	 	Title:	President

 

    	- 7 -PATENTS, TRADEMARKS

AND COPYRIGHTS SECURITY AGREEMENT

HUDSON TECHNOLOGIES, INC.

 

THIS PATENTS, TRADEMARKS
AND COPYRIGHTS SECURITY AGREEMENT is made on the 22nd day of June, 2012 between HUDSON TECHNOLOGIES, INC., a corporation organized
under the laws of the State of New York (the “Assignor”), the financial institutions which are now or which hereafter
become a party hereto (collectively, the “Lenders” and individually a “Lender”) and PNC BANK, NATIONAL
ASSOCIATION (“PNC”), as agent for Lenders (PNC, in such capacity, the “Agent”). Capitalized terms not defined
herein shall have the meanings ascribed to them in the Loan Agreement (as defined below).

 

WITNESSETH:

 

WHEREAS, Assignor (also
referred to herein as the “Guarantor”) has executed on even date hereof a Guaranty and Suretyship Agreement in connection
with a certain Revolving Credit, Term Loan and Security Agreement dated the date hereof (as same may be amended, restated, replaced,
modified and/or supplemented from time to time, the “Loan Agreement”) and other loan documents executed in connection
therewith (all of which are collectively referred to as the “Other Documents”) to Agent for its benefit and for the
ratable benefit of each Lender, to secure loans by Lenders to Hudson Technologies Company in the aggregate amount of up to $27,000,000
(as such amount may be increased from time to time); and

 

WHEREAS, the Assignor
owns the United States copyrights which have been registered with the United States Copyright Office and has made applications
for a United States copyright registration with the United States Copyright office with respect to applications listed on Schedule
A hereto (“Copyrights”), owns the United States patents and the applications for a United States patents listed on
Schedule B (“Patents”), owns the United States trademark applications and trademarks listed in Schedule C hereto, along
with the good-will of the Assignor to which such trademark applications and trademarks relate (“Trademarks”) and owns
the United States trademark applications filed in the United States Patent and Trademark Office based on its intent to use the
corresponding mark and listed on Schedule D, along with any good-will of the Assignor relating to such trademarks (“ITU Marks”);
and

 

WHEREAS, pursuant to
the Loan Agreement, the Assignor is required to and has conveyed and granted to Agent for its benefit and for the ratable benefit
of each Lender, a security interest in, among other things, all right, title and interest of the Assignor in, to and under all
of the Assignor’s Copyrights, Patents and Trademarks, whether presently existing or hereafter arising or acquired, and all
products, substitutions, replacements and proceeds thereof to secure all obligations of the Assignor to Agent for its benefit and
for the ratable benefit of each Lender, including contingent obligations; and

 

NOW, THEREFORE, for
good and valuable consideration, the receipt of which is hereby acknowledged, the Assignor does hereby absolutely grant and convey
to Agent for its benefit and for the ratable benefit of each Lender, a security interest in, all of the Assignor’s right,
title and interest in, to and under the following, whether presently existing or hereafter arising or acquired:

 

(a)          Each
of the Copyrights which are presently, or in the future may be, owned by the Assignor, in whole or in part, as well as any application
for a United States copyright registration now or hereafter made with the United States Copyright Office by the Assignor, as the
same may be updated hereafter from time to time;

 

(b) Each of the Patents, which
are presently, or in the future may be owned by the Assignor, in whole or in part, as well as all applications for United States
patents now or hereafter owned by the Assignor, as the same may be updated hereafter from time to time; and

 

(c) Each of the Trademarks, which
are presently, or in the future may be owned by the Assignor, in whole or in part, together with the good-will associated with
each Trademark, as well as all applications for Trademarks now or hereafter owned by the Assignor, as the same may be updated hereafter
from time to time.

 

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Said security interest
includes, without limitation, all proceeds thereof, the right to sue for past, present, and future infringements thereof, all rights
corresponding thereto throughout the world, and all reissues, divisions, continuations, renewals, extensions and continuations-in-part
thereof.

 

		1)	Assignor covenants and warrants that, to the extent that any
Patents, Trademarks and/or Copyrights exist:

 

(a)   it
is, to the best of its knowledge, the true and lawful exclusive owner of all the Copyrights listed on Schedule A and that said
Copyrights constitute all the United States Copyrights registered in the United States Copyright Office and applications for United
States Copyrights that the Assignor now owns;

 

(b)   it
is, to the best of its knowledge, the true and lawful exclusive owner and/or intended assignee of all the Patents listed on Schedule
B and that said Patents constitute all the United States Patents registered in the United States Patent and Trademark Office and
applications for United States Patents that the Assignor now owns;

 

(c)   it
is, to the best of its knowledge, the true and lawful exclusive owner of all the Trademarks listed on Schedule C and that said
Trademarks constitute all the United States Trademarks registered in the United States Patent and Trademark Office and applications
for Trademarks that the Assignor now owns;

 

(d)  The
Assignor agrees, at Agent’s request, on a semi-annual basis to execute such additional agreements with respect to any new
Patent, Trademark and/or Copyright in which the Assignor hereinafter obtains rights or any ITU Mark which becomes registered with
the United States Patent and Trademark Office. The Assignor further warrants that it is not aware of any third party claim that
any of the aspects of the Assignor’s present or contemplated business operations infringe or will infringe on any Patent,
Trademark or Copyright. The Assignor grants to Agent an absolute power of attorney to sign any document which will be required
by the United States Copyright Office or the United States Patent and Trademark Office in order to record the security interest
in the Patents, Trademarks and Copyrights;

 

(e)  the
Patents, Trademarks and Copyrights are subsisting and have not been adjudged invalid or unenforceable;

 

(f)   Each
of the Patents, Trademarks and Copyrights is in use and, to the best of the Assignor’s knowledge, does not infringe the rights
of any other person or entity;

 

(g)   Assignor
is, to the best of its knowledge, the sole and exclusive owner of the entire and unencumbered right, title and interest in and
to each of the Patents, Trademarks and Copyrights, free and clear of any liens other than Permitted Encumbrances, charges and encumbrances,
including without limitation pledges, assignments, licenses, registered user agreements, and covenants by Assignor not to sue third
persons, other than the assignment to Lenders pursuant to this Agreement;

 

(h)  Assignor
has the unqualified right to enter into this Agreement and perform its terms;

 

(i)   Assignor
believes it has used, and will use its good faith efforts to continue to use for the duration of this Agreement, proper statutory
notice in connection with its use of the Patents, Trademarks and Copyrights;

 

(j)    Assignor
has used, and will use good faith effort to continue to use for the duration of this Agreement, consistent standards of quality
in its manufacture or use of products sold under the Trademarks;

 

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(k)  At
its own expense, the Assignor shall make timely payment of all post-issuance fees required pursuant to 35 U.S.C. Sec. 41 to maintain
in force rights under each Patent, to the extent that Assignor deems advisable;

 

(l)   Except
in the ordinary course of business, the Assignor hereby agrees not to divest itself of any right under any Copyright, Trademark
and/or Patent, which divestiture would have a material adverse effect on Assignor’s business, its properties, or its ability
to perform its obligations under the Loan Agreement; and

 

(m)  The
Assignor agrees to promptly, upon learning thereof, furnish Agent in writing all pertinent information available to the Assignor
with respect to any infringement or other violation of the Assignor’s rights in any Copyright, Trademark and/or Patent, which
infringement or violation could have a material adverse effect on the Assignor, its properties or its ability to perform its obligations
under the Loan Agreement and Other Documents (as defined in the Loan Agreement). To the extent that the Assignor deems advisable,
the Assignor further agrees to prosecute any Persons infringing upon any Copyright, Trademark and/or Patent to the extent such
infringement could have a material adverse affect on the Assignor, its properties or its ability to perform its obligations under
the Loan Agreement or Other Documents.

 

		2)	Subject to the provisions of the Loan Agreement, Assignor hereby
grants to Agent and its employees and agents the right to visit Assignor’s facilities (during normal business hours and upon
reasonable notice) which maintain or store products sold under any of the Patents, Trademarks, or Copyrights, and to inspect the
products and quality control records relating thereto. Assignor shall do any and all acts reasonably required by Lenders to ensure
Assignor’s compliance herewith.

 

		3)	Assignor agrees that, until all of the Obligations shall have
been satisfied in full, it will not enter into any agreement which is inconsistent with Assignor’s obligations under this
Agreement, without Lenders’ prior written consent.

 

		4)	If, before the Obligations have been satisfied in full,:

 

(a)
Assignor shall obtain rights to any new Trademark, any new Copyright, or any new patentable inventions, or become entitled to the
benefit of any patent application or patent for reissue, division, continuation, renewal, extension, or continuation-in-part of
any Patent or any improvement on any Patent, the provisions hereof shall automatically apply thereto and Assignor shall give to
Lenders prompt notice thereof in writing; and

 

(b) any ITU Mark becomes registered
with the United States Patent and Trademark Office, the terms of this Agreement shall automatically apply without any further action
on the part of the Assignor or Lenders (including, without limitation, the grant of a security interest by Assignor to Lenders
in any such ITU Mark which becomes registered with the United States Patent and Trademark Office) and Assignor shall give to Lenders
prompt notice in writing of such ITU Mark becoming registered.

 

		5)	Assignor authorizes Agent to modify this Agreement by amending
Schedules A, B, C and D to include any future Patents, Trademarks, Copyrights or ITU Marks covered hereby.

 

		6)	Upon and during the occurrence of any Event of Default:

 

		a)	Agent shall have, in addition to all other rights and remedies
given to it by this Agreement, the Loan Agreement, and the Other Documents, those rights and remedies allowed by law and the rights
and remedies of a secured party under the Uniform Commercial Code as enacted in any jurisdiction in which the Patents, Trademarks,
or Copyrights may be located; and

 

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		b)	Agent may, in addition to any other remedies which may be available
to Lenders, without being deemed to have made an election of remedies, and without the assignment hereunder being deemed to be
anything less than an absolute assignment, immediately, without demand of performance and without other notice (except as may be
set forth below) or demand whatsoever to Assignor, all of which are hereby expressly waived, and without advertisement, sell at
public or private sale (or, to the extent required by law, otherwise realize upon in a commercially reasonable manner), all or
from time to time, any of the Patents, Trademarks, or Copyrights, or any interest which the Assignor may have therein, and after
deducting from the proceeds of sale or other disposition of the Patents, Trademarks, or Copyrights all reasonable expenses (including
all reasonable expenses for broker’s fees and legal services), may apply the residue of such proceeds to the payment of the
Obligations. Any remainder of the proceeds after payment in full of the Obligations shall be paid over to the Assignor. Notice
of any sale or other disposition of the Patents, Trademarks, or Copyrights shall be given to Assignor at least ten (10) business
days before the time of any intended public or private sale or other disposition of the Patents, Trademarks, or Copyrights is to
be made, which notice Assignor hereby agrees shall be reasonable notice of such sale or other disposition. At any such sale or
other disposition, Agent may, to the extent permissible under applicable law, purchase the whole or any part of the Patents, Trademarks,
or Copyrights sold, free from any right or equity of redemption on the part of Assignor, which right and equity of redemption are
hereby waived and released.

 

		7)	At such time as Assignor shall completely satisfy all of the
Obligations, this Agreement shall terminate and Agent shall execute and deliver to Assignor at Assignor’s expense all releases
and other instruments as may be necessary or proper to release the security interest in and to the Patents, Trademarks, or Copyrights,
subject to any disposition thereof which may have been made by Agent pursuant hereto and in accordance with the terms hereof.

 

		8)	Any and all fees, costs and expenses, of whatever kind or nature,
including reasonable attorney fees and legal expenses incurred by Agent in connection with the preparation of this Agreement and
all other documents relating hereto and the consummation of this transaction, the filing or recording of any documents (including
all taxes in connection therewith) in public offices, the payment or discharge of any taxes, counsel fees, maintenance fees, encumbrances
or otherwise protecting, maintaining or preserving the Patents, Trademarks, or Copyrights, in defending or prosecuting any actions
or proceedings arising out of or related to the Patents, Trademarks, or Copyrights, or in the enforcement by Agent of any of its
rights or remedies under this Agreement, the Loan Agreement or any Other Document shall be borne and paid by Assignor on demand
by Agent and until so paid shall be added to the principal amount of the Obligations and shall bear interest at the rate of interest
chargeable pursuant to the Loan Agreement upon an Event of Default.

 

		9)	To the extent that Assignor deems it advisable, Assignor shall
have the duty to prosecute diligently any actions for or of the Patents, Trademarks, or Copyrights pending as of the date of this
Agreement or thereafter until the Obligations shall have been paid in full, to make federal application on registrable but unregistered
Trademarks, to file and prosecute opposition and cancellation proceedings and to do any and all acts which are reasonably necessary
or desirable to preserve and maintain all rights in the Patents, Trademarks, or Copyrights. Any expenses incurred in connection
with the Patents, Trademarks, and Copyrights shall be borne by Assignor. The Assignor shall not abandon any Patents, Trademarks,
or Copyrights other than in the ordinary course of business without the consent of Agent, which consent shall not be unreasonably
withheld.

 

		10)	Assignor shall have the right to bring any opposition proceedings,
cancellation proceedings or lawsuit in its own name to enforce or protect the Patents, Trademarks, or Copyrights, in which event
Agent may, if necessary, be joined as a nominal party to such suit if Agent shall have been satisfied that it is not incurring
any risk of liability because of such joinder. Assignor shall promptly, upon demand, reimburse and indemnify Agent for all damages,
costs and expenses, including attorney fees, incurred by Agent in the fulfillment of the provisions of this paragraph. The obligations
of the Assignor under this paragraph shall survive the termination of this Agreement.

 

		11)	In the event of the occurrence and continuance of a Default or
an Event of Default, Assignor hereby authorizes and empowers Agent to make, constitute and appoint any officer or agent of Agent
as Agent’s may select, in its sole discretion, as Assignor’s true and lawful attorney-in-fact, with the power to endorse
Assignor’s name on all applications, documents, papers and instruments necessary for Agent to use the Patents, Trademarks,
or Copyrights, or to grant or issue any exclusive or nonexclusive license under the Patents, Trademarks, or Copyrights to anyone
else, or necessary for Agent to assign, pledge, convey or otherwise transfer title in or dispose of the Patents, Trademarks, or
Copyrights to anyone else. Assignor hereby ratifies all that such attorney shall lawfully do or cause to be done by virtue hereof.
This power of attorney shall be irrevocable for the life of this Agreement.

 

    	4

    	 

    

 

		12)	If Assignor fails to comply with any of its obligations hereunder,
Agent may do so in Assignor’s name or in Lenders’ name, but at Assignor’s expense, and Assignor hereby agrees
to reimburse Lenders in full for all reasonable expenses, including reasonable attorney’s fees, incurred by Lenders in protecting,
defending and maintaining the Patents, Trademarks, or Copyrights.

 

		13)	No course of dealing between Assignor and Agent, nor any failure
to exercise, nor any delay in exercising, on the part of Lenders, any right, power or privilege hereunder or under the Loan Agreement,
or under any Other Document shall operate as a waiver thereof; nor shall any single or partial exercise of any right, power or
privilege hereunder or thereunder preclude any other or further exercise thereof or the exercise of any other right, power or privilege.

 

		14)	All of Agent’s rights and remedies with respect to the
Patents, Trademarks, or Copyrights, whether established hereby or by the Loan Agreement, or by any other agreement(s) or by law,
shall be cumulative and may be exercised singly or concurrently.

 

		15)	The provisions of this Agreement are severable, and if any clause
or provision shall be held invalid and unenforceable in whole or in part in any jurisdiction, then such invalidity or unenforceability
shall affect only such clause or provision, or part thereof, in such jurisdiction, and shall not in any manner affect such clause
or provision in any other jurisdiction, or any other clause or provision of this Agreement in any jurisdiction.

 

		16)	This Agreement is subject to modification only by a writing signed
by the parties, except as provided elsewhere herein.

 

		17)	The benefits and burdens of this Agreement shall inure to the
benefit of and be binding upon the respective successors and permitted assigns of the parties.

 

		18)	The validity and interpretation of this Agreement and the rights
and obligations of the parties shall be governed by the laws of the State of New York.

 

		19)	THE PARTIES HERETO AGREE TO THE JURISDICTION OF THE FEDERAL AND
STATE COURTS LOCATED IN NEW YORK IN CONNECTION WITH ANY MATTER ARISING HEREUNDER, INCLUDING THE COLLECTION AND ENFORCEMENT HEREOF.
THE ASSIGNOR AND LENDERS EACH HEREBY IRREVOCABLY WAIVE ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM ARISING
OUT OF OR RELATING TO THIS AGREEMENT OR ANY OTHER DOCUMENT OR THE ACTIONS OF LENDERS. THIS WAIVER IS MADE KNOWINGLY AND IN CONSIDERATION
OF THE ADVANCES MADE UNDER THE LOAN AGREEMENT.

 

		20)	This Agreement, the Loan Agreement and the Other Documents embody
the entire agreement and understanding between the Assignor and Lenders and supersedes all prior agreements and understandings
relating to the subject matter hereof and thereof.

 

[SIGNATURE PAGES TO FOLLOW]

 

    	5

    	 

    

 

WITNESS the execution hereof under seal
as of the day and year first above written.

 

	ATTEST:	 	HUDSON TECHNOLOGIES, INC.
	 	 	 	 	 
	/s/ Stephen P. Mandracchia	 	BY:	/s/ Brian F. Coleman
	Name:	Stephen P. Mandracchia	 	Name:	Brian F. Coleman
	Title:	Secretary	 	Title:	President

 

[SIGNATURE PAGE TO FOLLOW]

 

    	6

    	 

    

 

	 	PNC BANK, NATIONAL ASSOCIATION
	 	 	 
	 	By:	/s/ Ivan Trajkovic 
	 	Name:	IVAN TRAJKOVIC
	 	Title:	Vice President

 

    	7

    	 

    

 

	STATE OF New Jersey	:
	 	SS:
	COUNTY OF Middlesex	:

 

I CERTIFY that on June
22, 2012, BRIAN F. COLEMAN personally came before me and stated under oath to my satisfaction that:

 

(a) this person is the President of Hudson Technologies,
Inc., the corporation named in this Instrument;

(b) this Instrument was signed and delivered by the
corporations as its voluntary act duly authorized by a proper resolution of its Board of Directors; and

(c) this person signed this acknowledgement to attest
to the truth of these facts.

 

Signed and sworn to before me on

June 22, 2012

 

	/s/ Joan E. Fabrizzi	 

 

Joan E. Fabrizzi

Notary Public, State of New Jersey

My Commission Expires Feb. 24, 2015

 

	STATE OF NEW JERSEY	:
	 	SS:
	COUNTY OF MIDDLESEX	:

 

I CERTIFY that on June
22, 2012, IVAN TRAJKOVIC, personally came before me and stated under oath to my satisfaction that:

 

(a) this person is the Vice President of PNC Bank, a
National Association, the corporation named in this Instrument;

(b) this Instrument was signed and delivered by the
corporation as its voluntary act duly authorized by a proper resolution of its Board of Directors;

(c) this person knows the proper seal of the corporation
which was affixed to this Instrument;

(d) this person signed this acknowledgement to attest
to the truth of these facts.

 

Signed and sworn to before me on

June 22, 2012

 

	/s/ Joan E. Fabrizzi	 

 

Joan E. Fabrizzi

Notary Public, State of New Jersey

My Commission Expires Feb. 24, 2015

 

    	8

    	 

    

 

SCHEDULE A

(Copyrights)

 

NONE

 

    	9

    	 

    

 

SCHEDULE B

 

Hudson Technologies, Inc.

Patent Schedule

 

	OFGS No	 	Patent No	 	Appln No	 	Issue Date	 	Title
	 	 	 	 	 	 	 	 	 
	5721-	 	5,802,959	 	08/766,957	 	08-Sept-98	 	APPARATUS FOR RECOVERING
	 	 	 	 	 	 	 	 	AND ANALYZING VOLATILE
	 	 		 	 	 	 	 	REFRIGERANT
	 	 		 	 	 	 	 	 
	5721-0080	 	6,141,977	 	09/146,590	 	07-Nov-00	 	APPARATUS FOR RECOVERING
	 	 		 	 	 	 	 	AND ANALYZING VOLATILE
	 	 		 	 	 	 	 	REFRIGERANT
	 	 	 	 	 	 	 	 	 
	5721-0061	 	6,164,080	 	09/373,301	 	26-Dec-00	 	APPARATUS AND METHODS FOR
	 	 		 	 	 	 	 	FLUSHING A REFRIGERANT SYSTEM
	 	 	 	 	 	 	 	 	 
	5721-0059	 	6,357,240	 	09/373,300	 	19-Mar-02	 	APPARATUS AND METHODS FOR
	 	 		 	 	 	 	 	FLUSHING A CHILLER SYSTEM
	 	 	 	 	 	 	 	 	 
	5721-0060	 	6,290,778	 	09/373,299	 	18-Sep-01	 	METHOD AND APPARATUS FOR
	 	 		 	 	 	 	 	SONIC CLEANING OF HEATING
	 	 		 	 	 	 	 	EXCHANGERS
	 	 	 	 	 	 	 	 	 
	5721-0048	 	7,599,759	 	10/730,791	 	06-Oct-09	 	METHOD AND APPARATUS FOR
	 	 		 	 	 	 	 	OPTIMIZING REFRIGERANT SYSTEMS
	 	 	 	 	 	 	 	 	 
	5721-0014	 	8,064,107	 	12/565,147	 	25-Oct-11	 	METHOD AND APPARATUS FOR
		 	 	 	 	 	 	 	OPTIMIZING REFIGERATION SYSTEMS
	 	 	 	 	 	 	 	 	 
	5721-0078	 		 	13/280,302	 	 	 	METHOD AND APPARATUS FOR
		 	 	 	 	 	 	 	OPTIMIZING REFIGERATION SYSTEMS
	 	 	 	 	 	 	 	 	 
	5721-0073	 	5,502,974	 		 	 02-Apr-96	 	HYDRAULIC SYSTEM FOR
	 	 		 	 	 	 	 	RECOVERING REFRIGERANT
	 	 	 	 	 	 	 	 	 
	5721-0072	 	5,377,499	 		 	 03-Jan-95 	 	METHOD AND APPARATUS FOR 
	 	 		 	 	 	 	 	REFRIGERANT RECLAMATION
	 	 	 	 	 	 	 	 	 
	5721-0015	 		 	12/251,385	 	 	 	SYSTEM AND METHOD FOR
	 	 		 	 	 	 	 	RECYCLING NON-REUSABLE 
	 	 		 	 	 	 	 	REFRIGERANT CONTAINERS

 

    	10

    	 

    

 

SCHEDULE C

 

Hudson Technologies, Inc.

Trademark Schedule

 

	OF No	 	Reg No	 	Appln No	 	File Date	 	Mark
	 	 	 	 	 	 	 	 	 
	5721-0013	 		 	85/041,598	 	18-May-10	 	CLEAN EXCHANGE
	 	 	 	 	 	 	 	 	 
	5721-0063	 	2,559,214	 	75/532,327	 	06-Aug-98	 	REFRIGERANTSIDE
	 	 	 	 	 	 	 	 	 
	5721-0064	 	2,601,434	 	75/532,328	 	06-Aug-98	 	R-SIDE
	 	 	 	 	 	 	 	 	 
	5721-0065	 	3,788,857	 	77/638,497	 	22-Dec-08	 	FLUID CHEMISTRY
	 	 	 	 	 	 	 	 	 
	5721-0066	 	3,184,719	 	78/591,413	 	21-Mar-05	 	CHILLSMART
	 	 	 	 	 	 	 	 	 
	5721-0069	 	3,190,044	 	78/591,426	 	21-Mar-05	 	CHILLER CHEMISTRY
	 	 	 	 	 	 	 	 	 
	5721-0074	 	1,969,986	 	74/677,360	 	19-May-95	 	HUDSON TECHNOLOGIES, INC.
	 	 	 	 	 	 	 	 	 
	5721-0075	 	1,985,422	 	74/682,909	 	01-Jun-95	 	ZUGIBEAST
	 	 	 	 	 	 	 	 	 
	5721-0076	 	2,227,148	 	75/253,240	 	07-Mar-97	 	GLACIER
	 	 	 	 	 	 	 	 	 
	5721-0077	 		 	85/428,775	 	21-Sept-11	 	AMERI-PURE

 

    	11

    	 

    

 

SCHEDULE D

(ITU Marks)

 

NONE

 

    	12

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