(19)

(11)

EP 0 412 985 A1

(12)

(43) Date of publication: 20.02.1991 Bulletin 1991/08 (21) Application number: 89905143.0 (22) Date of filing: 02.05.1989

(51) International Patent Classification (IPC):  C10F 5/ 00( . ) C10G 1/ 04( . ) (86) International application number: PCT/GB1989/000462 (87) International publication number: WO 1989/010391 (02.11.1989 Gazette 1989/26)

(84) Designated Contracting States: BE DE FR GB IT LU NL SE (30) Priority: 30.04.1988 GB 19880010347 (71) Applicant: FOSTER WHEELER ENERGY LIMITED Reading RE1 1LX (GB)	(72) Inventors: DRAKE, John, A., G. Knaresborough HG5 9EL (GB) HUGHES, Michael, Anthony Leeds LS28 7TT (GB) (74) Representative: Browne, Robin Forsythe, Dr.  Urquhart-Dykes & Lord Tower House Merrion Way Leeds LS2 8PA West Yorkshire Leeds LS2 8PA West Yorkshire (GB)