(19)

(11)

EP 0 614 442 A1

(12)

(43) Date of publication: 14.09.1994 Bulletin 1994/37 (21) Application number: 93900541.0 (22) Date of filing: 19.11.1992

(51) International Patent Classification (IPC):  B01D 53/ 34( . ) B01D 53/ 60( . ) (86) International application number: PCT/US1992/009950 (87) International publication number: WO 1993/011066 (10.06.1993 Gazette 1993/14)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL SE (30) Priority: 27.11.1991 US 19910800588 (71) Applicant: NALCO FUEL TECH Naperville, Il 60566-7031 (US)	(72) Inventors: GULLETT, Brian, K. Durham, NC 27705 (US) HOFMANN, John, E. Naperville, IL 60540 (US) PETER-HOBLYN, Jeremy, D. Cornwall PL30 3NR (GB) VALENTINE, James, M. Faifield, CT 06430 (US) (74) Representative: VOSSIUS & PARTNER  Siebertstrasse 4 D-81675 München D-81675 München (DE)