(19)

(11)

EP 0 948 584 A1

(12)

(43) Date of publication: 13.10.1999 Bulletin 1999/41 (21) Application number: 97911373.0 (22) Date of filing: 11.11.1997

(51) International Patent Classification (IPC):  C10L 1/ 02( . ) C10L 1/ 06( . ) (86) International application number: PCT/GB1997/003084 (87) International publication number: WO 1998/022556 (28.05.1998 Gazette 1998/21)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE (30) Priority: 18.11.1996 GB 19960023934 (71) Applicant: BP OIL INTERNATIONAL LIMITED London EC2M 7BA (GB)	(72) Inventor: CLARK, Alisdair, Quentin Hants GU12 6LS (GB) (74) Representative: Wilson, Michael John  BP International Limited, Group Patents & Agreements, Chertsey Road Sunbury on Thames, Middlesex TW16 7LN Sunbury on Thames, Middlesex TW16 7LN (GB)