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(11)

EP 2 142 472 A1

(12)

(43) Date of publication: 13.01.2010 Bulletin 2010/02 (21) Application number: 08749855.6 (22) Date of filing: 29.04.2008

(51) International Patent Classification (IPC):  C01B 15/10(2006.01) (86) International application number: PCT/EP2008/055254 (87) International publication number: WO 2008/135462 (13.11.2008 Gazette 2008/46)

(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 (30) Priority: 02.05.2007 EP 07107378 (71) Applicant: SOLVAY (Société Anonyme) 1050 Bruxelles (BE)	(72) Inventors: RABE, Jürgen 56598 Rheinbrohl (DE) VENBRUX, Henk B-3080 Tervuren (BE) HOFFMANN, Bernd 53604 Bad Honnef (DE) (74) Representative: Vande Gucht, Anne et al Solvay S.A. Département de la Propriété Industrielle Rue de Ransbeek, 310 1120 Bruxelles 1120 Bruxelles (BE)