(19)

(11)

EP 0 964 732 A1

(12)

(43) Date of publication: 22.12.1999 Bulletin 1999/51 (21) Application number: 98907678.0 (22) Date of filing: 27.02.1998

(51) International Patent Classification (IPC):  B01D 3/ 20( . ) B01J 19/ 32( . ) B01J 10/ 00( . ) (86) International application number: PCT/US1998/003920 (87) International publication number: WO 1998/039077 (11.09.1998 Gazette 1998/36)

(84) Designated Contracting States: BE CH DE ES FR GB IT LI NL (30) Priority: 03.03.1997 US 19970811434 (71) Applicant: Koch Enterprises, Inc. Wichita, KS 67220 (US)	(72) Inventors: LEE, Adam, T. Richardson, TX 75082 (US) WU, Kuang Plano, TX 75093 (US) BURTON, Larry De Soto, TX 75115 (US) Fan, Leon Carrollton, TX 75007 (US) (74) Representative: Ede, Eric  Fitzpatricks, 4 West Regent Street Glasgow G2 1RS Glasgow G2 1RS (GB)