(19)

(11)

EP 1 252 090 A1

(12)

(43) Date of publication: 30.10.2002 Bulletin 2002/44 (21) Application number: 01900477.9 (22) Date of filing: 05.01.2001

(51) International Patent Classification (IPC)7: C01B 3/38, B01J 8/04 (86) International application number: PCT/GB0100/024 (87) International publication number: WO 0105/5027 (02.08.2001 Gazette 2001/31)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR (30) Priority: 25.01.2000 GB 0001540 (71) Applicant: Imperial Chemical Industries PLC London W1U 3AN (GB)	(72) Inventor: FARNELL, Peter, William StokesleyNorth Yorkshire TS9 5DE (GB) (74) Representative: Gibson, Sara Hillary Margaret  Synetix Intellectual Property Dept.,Building N, Room N101, Chilton Site,P.O. Box 1,Belasis Avenue Billingham, Cleveland TS23 1LB Billingham, Cleveland TS23 1LB (GB)