Rentech Announces REN Corp./ Caterpillar Contract

    DENVER and STILLWATER, Okla., July 19 Rentech Inc.,
(Amex: RTK) today announced that REN CORPORATION (REN), a Company in which
Rentech has made a substantial investment and is in the process of acquiring a
majority position, has received purchasing orders from Caterpillar Inc.
that have pushed orders at REN to a record level.  The orders for
automated test equipment, with deliveries commencing in early fiscal year
2002, have increased the value of REN's current projects to more than
$3 million.
    The advanced control software that REN recently introduced will be
incorporated into Caterpillar test stands.  This integrated system brings
together REN's field proven 9025 controller with the latest graphical user
interface techniques.  REN expects that the advanced software platform will
provide a basis for their continued leadership role in the field of automation
software.
    "The Caterpillar orders are very important to us," commented Ryan Ashley,
REN's design group leader and program manager for the Caterpillar projects,
"Cat(R) is providing REN a great opportunity to contribute to their customer
focused drive for excellence.  Our fluid power testing platforms will provide
increased process efficiency while performing very thorough and precise
testing of their production components."
    REN CORPORATION president Gary A. Roberts stated, "At a time when many
manufacturing companies are retrenching, REN has continued to grow and
increase its market share.  We expect that by the end of the third quarter the
value of REN's booked orders will be the largest in Company history.  An
important factor in our success is the stability and support provided by
Rentech, Inc. which is in the process of acquiring a majority interest in REN
CORPORATION."

    Caterpillar is the world's leading manufacturer of
construction and mining equipment, diesel and natural gas engines and
industrial gas turbines.

    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

    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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