(19)

(11)

EP 0 632 743 A1

(12)

(43) Date of publication: 11.01.1995 Bulletin 1995/02 (21) Application number: 93907930.0 (22) Date of filing: 26.03.1993

(51) International Patent Classification (IPC):  B01D 69/ 10( . ) B01J 29/ 06( . ) B01D 71/ 02( . ) B01J 37/ 02( . ) (86) International application number: PCT/GB1993/000627 (87) International publication number: WO 1993/019840 (14.10.1993 Gazette 1993/25)

(84) Designated Contracting States: AT BE DE DK ES FR GB IT NL SE (30) Priority: 27.03.1992 GB 19920006783 (71) Applicant: THE BRITISH PETROLEUM COMPANY P.L.C. London EC2M 7BA (GB)	(72) Inventors: BRATTON, Graham John Sidcup, Kent DA15 8AL (GB) NAYLOR, Timothy de Villiers Egham, Surrey TW20 0NQ (GB) (74) Representative: Wilson, Michael John, et al  BP International Limited, Patents & Agreements Division, Chertsey Road Sunbury-on-Thames, Middlesex TW16 7LN Sunbury-on-Thames, Middlesex TW16 7LN (GB)