(19)

(11)

EP 1 937 391 A1

(12)

(43) Date of publication: 02.07.2008 Bulletin 2008/27 (21) Application number: 06793512.2 (22) Date of filing: 14.09.2006

(51) International Patent Classification (IPC):  B01D 53/50(2006.01) (86) International application number: PCT/EP2006/066359 (87) International publication number: WO 2007/031552 (22.03.2007 Gazette 2007/12)

(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: 15.09.2005 US 229056 (71) Applicant: Solvay Chemicals, Inc. Houston, TX 77098-3009 (US)	(72) Inventors: MAZIUK, John Kingwood, Texas 77345 (US) RAYTHATHA, Rasik Kingwood, Texas 77345 (US) (74) Representative: Gilliard, Pierre et al Solvay (Société Anonyme), Intellectual Property Department, Rue de Ransbeek, 310 1120 Bruxelles 1120 Bruxelles (BE)