(19)

(11)

EP 2 601 138 A1

(12)

(43) Date of publication: 12.06.2013 Bulletin 2013/24 (21) Application number: 11735443.1 (22) Date of filing: 25.07.2011

(51) International Patent Classification (IPC):  C01D 3/06(2006.01) C25B 1/34(2006.01) C01D 3/14(2006.01) (86) International application number: PCT/EP2011/062711 (87) International publication number: WO 2012/016872 (09.02.2012 Gazette 2012/06)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 02.08.2010 FR 1056360 (71) Applicant: SOLVAY SA 1120 Bruxelles (BE)	(72) Inventors: GILBEAU, Patrick B-7090 Braine-le-Comte (BE) FOUCHET, Bruno B-1180 Uccle (BE) (74) Representative: Vande Gucht, Anne et al Solvay S.A. Intellectual Assets Management Rue de Ransbeek, 310 1120 Bruxelles 1120 Bruxelles (BE)