(19)

(11)

EP 2 209 922 A2

(12)

(88) Date of publication A3: 09.07.2009 (43) Date of publication: 28.07.2010 Bulletin 2010/30 (21) Application number: 08851362.7 (22) Date of filing: 19.11.2008

(51) International Patent Classification (IPC):  C21B 13/00(2006.01) C01B 3/34(2006.01) C01B 3/02(2006.01) (86) International application number: PCT/EP2008/065797 (87) International publication number: WO 2009/065843 (28.05.2009 Gazette 2009/22)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 20.11.2007 EP 07121142 (71) Applicant: Shell Internationale Research Maatschappij B.V. 2596 HR The Hague (NL)	(72) Inventors: VAN HEERINGEN, Gijsbert Jan NL-1031 CM Amsterdam (NL) VAN DER PLOEG, Hendrik Jan NL-1031 CM Amsterdam (NL) SMIT, Cornelis Jacobus NL-1031 CM Amsterdam (NL) (74) Representative: Matthezing, Robert Maarten  Shell International B.V. Intellectual Property Services P.O. Box 384 2501 CJ The Hague 2501 CJ The Hague (NL)