(19)

(11)

EP 0 989 902 A1

(12)

(43) Date of publication: 05.04.2000 Bulletin 2000/14 (21) Application number: 98931121.2 (22) Date of filing: 15.06.1998

(51) International Patent Classification (IPC)7: B01D 53/52, B01D 53/84, C01B 17/05 (86) International application number: PCT/NL9800/342 (87) International publication number: WO 9857/731 (23.12.1998 Gazette 1998/51)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IT LI NL PT SE Designated Extension States: LT RO (30) Priority: 17.06.1997 NL 1006339 (71) Applicant: Stork Engineers & Contractors B.V. 1043 NT Amsterdam (NL)	(72) Inventor: LAGAS, Jan, Adolf NL-1141 JD Monnickendam (NL) (74) Representative: Ottevangers, Sietse Ulbe et al Vereenigde OctrooibureauxNieuwe Parklaan 97 2587 BN 's-Gravenhage 2587 BN 's-Gravenhage (NL)