(19)

(11)

EP 0 131 590 A1

(12)

(43) Date of publication: 23.01.1985 Bulletin 1985/04 (21) Application number: 84900291.0 (22) Date of filing: 22.12.1983

(51) International Patent Classification (IPC):  C09K 5/ 04( . ) F25B 15/ 00( . ) (86) International application number: PCT/GB1983/000347 (87) International publication number: WO 1984/002715 (19.07.1984 Gazette 1984/17)

(84) Designated Contracting States: AT BE CH DE FR GB LI NL SE (30) Priority: 03.01.1983 DE 19833300023 (71) Applicant: The British Petroleum Company p.l.c. London EC2Y 9BU (GB)	(72) Inventor: VELTWISCH, Dieter D-2080 Pinneberg (DE) (74) Representative: Ryan, Edward Terrence, et al  BP INTERNATIONAL LIMITED, Patents Division Chertsey Road Sunbury-on-Thames Middlesex, TW16 7LN Sunbury-on-Thames Middlesex, TW16 7LN (GB)