RENTECH'S SYNTHETIC JET FUEL CERTIFIED FOR COMMERICAL AVIATION.

Rentech, Inc. (NYSE AMEX: RTK),Los Angeles, has announced that ASTM International's full governance committee has unanimously approved modifying the specifications for commercial aviation jet fuel to include up to a 50/50 blend of synthetic Fischer-Tropsch jet fuel. The jet fuel certified by the Federal Aviation Administration (FAA) for use in commercial aircraft relies on ASTM's specifications. Rentech's jet fuel, RenJet(r), qualifies under the approved specifications of synthetic jet fuel.

With the ASTM specifications, fuel derived using the Fischer-Tropsch process, including RenJet(r) produced from renewable or fossil feedstocks, is the first and currently only alternative jet fuel certified for use by the FAA. Rentech currently produces jet fuel at its Product Demonstration Unit that, when blended with petroleum-derived fuel, meets the ASTM International specifications. RenJet(r) is biodegradable, clean burning and virtually free of particulates, sulfur and aromatics.

D. Hunt Ramsbottom, president and Chief Executive Officer of Rentech, stated, "ASTM's approval of synthetic jet fuel for use in commercial aviation marks the achievement of a significant milestone for Rentech, the commercial aviation industry and the country." Mr. Ramsbottom continued, "Rentech is one of the few companies that has the technology to produce and supply these fuels to the commercial aviation market and the U.S. Air Force, which has already certified the use of synthetic fuels in most of its aircraft."

About Rentech, Inc.

Rentech, Inc., incorporated in 1981, provides clean energy solutions. The company's Rentech-SilvaGas biomass gasification process can convert multiple biomass feedstocks into synthesis gas (syngas) for production of renewable fuels and power. Combining the gasification process with Rentech's unique application of proven syngas conditioning and clean-up technology and the patented Rentech Process based on Fischer-Tropsch chemistry, Rentech offers an integrated solution for production of synthetic fuels from biomass. The Rentech Process can also convert syngas from fossil resources into ultra-clean synthetic jet and diesel fuels, specialty waxes and chemicals. Final product upgrading is provided under an alliance with UOP, a Honeywell company. Rentech develops projects and licenses these technologies for application in synthetic fuels and power facilities worldwide. Rentech Energy Midwest Corporation, the company's wholly-owned subsidiary, manufactures and sells nitrogen fertilizer products including ammonia, urea ammonia nitrate, urea granule, and urea solution in the corn-belt region of the central United States.

For more information, visit http://www.rentechinc.com or call 310/571-9800, ext. 341.

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