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'''Rentech Inc.''' (AMEX: RTK), based in Los Angeles, California, is a synthetic fuels ([[synfuels]]) technology and development company. It has developed and patented the Fischer-Tropsch gas/coal-to-liquids technology, which uses coal, petroleum coke, or natural gas to produce diesel or jet fuel.<ref name="Rentech_Website">[http://www.rentechinc.com/ Rentech website], accessed April 2008.</ref> It is currently attempting to build several coal-to-liquids plants, despite having an abysmal financial track record.