(19)

(11)

EP 0 097 696 A1

(12)

(43) Date of publication: 11.01.1984 Bulletin 1984/02 (21) Application number: 83900307.0 (22) Date of filing: 09.12.1982

(51) International Patent Classification (IPC):  B01D 17/ 00( . ) C10M 175/ 00( . ) B01D 21/ 00( . ) (86) International application number: PCT/US1982/001720 (87) International publication number: WO 1983/002240 (07.07.1983 Gazette 1983/16)

(84) Designated Contracting States: BE DE FR GB LU NL SE (30) Priority: 30.12.1981 US 19810335807 (71) Applicant: Economics Laboratory, Inc. Saint Paul, MN 55102 (US)	(72) Inventors: ROWAN, Henry A. Watchung, NJ 07060 (US) HAMILTON, William Somerset, NJ 08873 (US)