(19)

(11)

EP 0 951 521 A1

(12)

(43) Date of publication: 27.10.1999 Bulletin 1999/43 (21) Application number: 97952465.0 (22) Date of filing: 15.12.1997

(51) International Patent Classification (IPC):  C10G 2/ 00( . ) (86) International application number: PCT/US1997/023191 (87) International publication number: WO 1998/027181 (25.06.1998 Gazette 1998/25)

(84) Designated Contracting States: BE DE ES FR GB IT (30) Priority: 16.12.1996 US 19960033375P (71) Applicant: Rentech Inc. Denver, CO 80202 (US)	(72) Inventors: BENHAM, Charles, B. Littleton, CO 80123 (US) BOHN, Mark, S. Golden, CO 80401 (US) YAKOBSON, Dennis, L. Arvada, CO 80005 (US) (74) Representative: Watts, Peter Graham  Anthony Cundy & Co., 1 Olton Bridge, 245 Warwick Road Solihull, West Midlands B92 7AH Solihull, West Midlands B92 7AH (GB)