(19)

(11)

EP 0 539 463 A1

(12)

(43) Date of publication: 05.05.1993 Bulletin 1993/18 (21) Application number: 91913388.0 (22) Date of filing: 15.07.1991

(51) International Patent Classification (IPC):  B01D 46/ 52( . ) B01D 46/ 42( . ) B01D 46/ 24( . ) (86) International application number: PCT/GB1991/001169 (87) International publication number: WO 1992/001501 (06.02.1992 Gazette 1992/04)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 14.07.1990 GB 19900015532 (71) Applicant: BRIND ENVIRONMENTAL LIMITED Alfreton, Derbyshire DE5 7RG (GB)	(72) Inventor: GIBSON, Glenville Allestree Derby, DE22 2DQ (GB) (74) Representative: Drever, Ronald Fergus  Swindell & Pearson 48, Friar Gate Derby DE1 1GY Derby DE1 1GY (GB)