(19)

(11)

EP 0 784 721 A1

(12)

(43) Date of publication: 23.07.1997 Bulletin 1997/30 (21) Application number: 95934908.0 (22) Date of filing: 03.10.1995

(51) International Patent Classification (IPC):  B01D 5/ 00( . ) D21C 9/ 10( . ) C02F 1/ 04( . ) D21C 11/ 00( . ) (86) International application number: PCT/SE1995/001121 (87) International publication number: WO 1996/011299 (18.04.1996 Gazette 1996/17)

(84) Designated Contracting States: AT DE ES FR PT SE (30) Priority: 05.10.1994 SE 19940003372 12.06.1995 US 19950000139 14.06.1995 SE 19950002169 20.06.1995 US 19950001914 (71) Applicant: Eka Chemicals AB 445 80 Bohus (SE)	(72) Inventors: LANDFORS, Johan S-854 68 Sundsvall (SE) JOHANSSON, Hans S-436 39 Askim (SE) ENGSTRÖM, Mikael S-181 32 Lidingö (SE) (74) Representative: Schöld, Zaid  Eka Chemicals AB, Patent Department, Box 11556 100 61 Stockholm 100 61 Stockholm (SE)