Rentech Announces REN Corp./ Parker Hannifen Contracts

    DENVER and STILLWATER, Okla., Aug. 6 - Rentech Inc.,
(Amex: RTK) today announced that REN CORPORATION (REN), has further increased
its record setting sales efforts with new purchase orders received from Parker
Hannifin Corporation .  Rentech has made a substantial investment in
REN and is in the process of acquiring a majority position.
    The orders from Parker Hydraulics, which are valued at more than
$500,000 are for a new automated test stand, as well as renovation and
relocation of older model REN equipment.  The new test stand will be capable
of testing both hydraulic pumps and motors and will be fitted with REN's third
generation control software.  The combination of a state of the art graphical
user interface with the operational reliability of REN's 9025 controller will
provide Parker's assembly and test operation with exceptional productivity and
flexibility.
    "We are very proud that REN has been selected to be a part of Parker's
commitment to utilizing the latest industrial and information systems and
practices to keep Parker's plants at the leading edge of manufacturing
technology," stated REN CORPORATION President Gary A. Roberts.  "As a result
of their recent acquisitions, our history as a supplier of test equipment to
Parker now extends back more than 12 years with test stands installed in
several of their plants in North America and Asia," continued Roberts.

    Parker Hannifin Corporation, with headquarters in Cleveland, Ohio is the
world leader in motion and control technologies, providing systematic,
precision-engineered solutions for a variety of commercial, industrial,
mobile, instrumentation and aerospace markets.

    REN CORPORATION, located in Stillwater, Oklahoma, is a twenty-year old
manufacturer of automated industrial systems, specializing in test equipment
for the fluid power industry.

    Rentech, Inc. is the developer and licensor of a patented and proprietary
Fischer-Tropsch, gas-to-liquids process, for the conversion of synthesis gas
made from natural gas, industrial off-gas, or solid or liquid carbon-bearing
materials into high-value fuels, products and chemicals.  These products
include cleaner burning, sulfur- and aromatic-free diesel fuel, naphtha, waxes
and fuel for fuel cells.

    SAFE HARBOR STATEMENT
    Certain information presented herein may contain "forward-looking"
statements as defined by the safe harbor provisions of the Private Securities
Litigation Reform Act of 1995 and within the meaning of Section 27A of the
Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934.
Any number of important risk factors could cause actual results to differ
materially from those in the forward-looking statements herein and include and
are not limited to:  cancellation of GTL studies, poor weather restricting oil
field service work; inclement weather reducing orders for sealers and paints;
and, the inability of debtors to pay for product or services.  For more
information concerning risk factors that could cause such a difference, see
the Company's annual report on Form 10-K and quarterly reports on Form 10-Q
filed with the Securities and Exchange Commission.  Although Rentech believes
its statements to be reasonable, investors are cautioned that such
forward-looking statements involve risk and uncertainties.  The Company
undertakes no obligation to publicly release the result of any revisions to
any such forward-looking statements that may be made to reflect events or
circumstances after the date hereof or to reflect the occurrence of
unanticipated events.

    For more information please contact:  Mr. Gary A. Roberts, President, REN
CORPORATION at 405-533-2700, or by E-mail at sales@rencorp.com, or see the
Company's website at http://www.TestStand.com.
    For general information inquiries contact:  Mark Koenig, Director of
Investor Relations, Rentech, Inc. at 303-298-8008, or by E-mail at
mkir@rentk.com, or see the Company's web site at:  http://www.rentechinc.com.

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