(19)

(11)

EP 0 380 520 A1

(12)

(43) Date of publication: 08.08.1990 Bulletin 1990/32 (21) Application number: 88908006.0 (22) Date of filing: 23.08.1988

(51) International Patent Classification (IPC):  C10G 9/ 16( . ) C23G 5/ 00( . ) (86) International application number: PCT/US1988/002944 (87) International publication number: WO 1989/004357 (18.05.1989 Gazette 1989/11)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 30.10.1987 US 19870115782 (71) Applicant: ASHLAND OIL, INC. Ashland, KY 41114 (US)	(72) Inventor: TURNER, Joe, D. Ashland, KY 41101 (US) (74) Representative: Lambert, Hugh Richmond  D. YOUNG & CO., 21 New Fetter Lane London EC4A 1DA London EC4A 1DA (GB)