(19)

(11)

EP 0 404 908 A1

(12)

(43) Date of publication: 02.01.1991 Bulletin 1991/01 (21) Application number: 90900622.0 (22) Date of filing: 22.11.1989

(51) International Patent Classification (IPC):  B01J 21/ 12( . ) C10G 11/ 04( . ) (86) International application number: PCT/US1989/005298 (87) International publication number: WO 1990/005702 (31.05.1990 Gazette 1990/12)

(84) Designated Contracting States: AT BE CH DE ES FR GB IT LI LU NL SE (30) Priority: 23.11.1988 US 19880275470 (71) Applicant: CHEVRON RESEARCH COMPANY San Francisco, CA 94120-7141 (US)	(72) Inventor: PECORARO, Theresa, A. San Ramon, CA 94583 (US) (74) Representative: Müller-Boré & Partner Patentanwälte  Grafinger Strasse 2 D-81671 München D-81671 München (DE)