(19)

(11)

EP 0 752 909 A1

(12)

(43) Date of publication: 15.01.1997 Bulletin 1997/03 (21) Application number: 95913276.0 (22) Date of filing: 30.03.1995

(51) International Patent Classification (IPC):  C02F 3/ 06( . ) B01D 53/ 84( . ) B01D 71/ 70( . ) B01D 53/ 22( . ) B01D 53/ 86( . ) (86) International application number: PCT/GB1995/000744 (87) International publication number: WO 1995/026806 (12.10.1995 Gazette 1995/43)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 30.03.1994 GB 19940006323 (71) Applicant: IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY & MEDICINE London SW7 2AZ (GB)	(72) Inventors: LIVINGSTON, Andrew, Imp. College of London SW7 2AZ2AZ (GB) FREITAS DOS SANTOS, Luisa, M. Imp. College of London SW7 2AZ (GB) (74) Representative: March, Gary Clifford  Batchellor, Kirk & Co. 2 Pear Tree Court Farringdon Road London EC1R 0DS London EC1R 0DS (GB)