(19)

(11)

EP 0 439 461 A1

(12)

(43) Date of publication: 07.08.1991 Bulletin 1991/32 (21) Application number: 89904040.0 (22) Date of filing: 06.04.1989

(51) International Patent Classification (IPC):  B01D 69/ 14( . ) B01J 29/ 70( . ) C07C 7/ 144( . ) B01J 29/ 06( . ) C01B 39/ 02( . ) (86) International application number: PCT/EP1989/000368 (87) International publication number: WO 1989/009642 (19.10.1989 Gazette 1989/25)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 07.04.1988 NL 19880000889 (71) Applicant: VAN DER KUIP, P., C. NL-2243 CR Wassenaar (NL)	(72) Inventor: VAN DER KUIP, P., C. NL-2243 CR Wassenaar (NL)