(19)

(11)

EP 0 590 010 A1

(12)

(43) Date of publication: 06.04.1994 Bulletin 1994/14 (21) Application number: 92913108.0 (22) Date of filing: 05.06.1992

(51) International Patent Classification (IPC):  B01J 8/ 32( . ) C01B 3/ 42( . ) C01B 3/ 40( . ) C01B 3/ 44( . ) (86) International application number: PCT/US1992/004753 (87) International publication number: WO 1992/021609 (10.12.1992 Gazette 1992/31)

(84) Designated Contracting States: DE FR GB IT NL (30) Priority: 07.06.1991 US 19910711762 (71) Applicant: EXXON RESEARCH AND ENGINEERING COMPANY Florham Park, New Jersey 07932-0390 (US)	(72) Inventors: LAHN, Gerard, Charles Morristown, NJ 07960 (US) KAISER, Frederick, John, Jr. Morris Plains, NJ 07950 (US) FIATO, Rocco, Anthony Basking Ridge, NJ 07920 (US) (74) Representative: Fletcher Watts, Susan J., et al  ESSO Engineering (Europe) Limited, Patents and Licences, Mailpoint 72, Esso House, Ermyn Way Leatherhead, Surrey KT22 8XE Leatherhead, Surrey KT22 8XE (GB)