(19)

(11)

EP 0 659 102 A1

(12)

(43) Date of publication: 28.06.1995 Bulletin 1995/26 (21) Application number: 93921387.0 (22) Date of filing: 07.09.1993

(51) International Patent Classification (IPC):  B01D 53/ 68( . ) B01D 53/ 70( . ) (86) International application number: PCT/US1993/008392 (87) International publication number: WO 1994/005399 (17.03.1994 Gazette 1994/07)

(84) Designated Contracting States: DE FR GB SE (30) Priority: 09.09.1992 US 19920943004 (71) Applicant: GREAT LAKES CHEMICAL CORPORATION West Lafayette Indiana 47906 (US)	(72) Inventors: IIKUBO, Yuichi West Lafayette, IN 47906 (US) QIAN, John C. El Dorado, AR 71730 (US) (74) Representative: Atkinson, Peter Birch, et al  MARKS & CLERK, Sussex House, 83-85 Mosley Street Manchester M2 3LG Manchester M2 3LG (GB)