(19)

(11)

EP 1 794 083 A1

(12)

(43) Date of publication: 13.06.2007 Bulletin 2007/24 (21) Application number: 05789543.5 (22) Date of filing: 04.10.2005

(51) International Patent Classification (IPC):  C01B 3/34(2006.01) C01B 3/38(2006.01) (86) International application number: PCT/EP2005/054992 (87) International publication number: WO 2006/037782 (13.04.2006 Gazette 2006/15)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 04.10.2004 EP 04256132 (71) Applicant: Shell Internationale Research Maatschappij B.V. 2596 HR The Hague (NL)	(72) Inventors: SCHOLTEN, Wilhelmus, Johannes, Franciscus NL-1031 CM Amsterdam (NL) TIO, Thian, Hoey NL-1031 CM Amsterdam (NL) (74) Representative: Zeestraten, Albertus W. J. et al Shell International B.V., Intellectual Property Services, P.O. Box 384 2501 CJ The Hague 2501 CJ The Hague (NL)