Patent ID: 7879244
Filing Date: 2011-02-01
Classification: B01D,B01J,C02F

Abstract:
1. A method for the removal of a substance carrying a negative charge from an aqueous liquid (I), said method comprising the steps of i) contacting the liquid with an anion-exchanger (1) that comprises a base matrix carrying a plurality of mixed mode anion-exchanging ligands in which there is a positively charged nitrogen under conditions permitting binding between the ligands and the substance; and ii) desorbing said substance from said anion-exchanger by the use of a liquid (liquid (II)), wherein (A) all or a part of the plurality of mixed mode anion-exchange ligands have a thioether linkage within a distance of 1-7 atoms from its positively charged nitrogen, and (B) the anion-exchanger (1) is said anion-exchangers having essentially the same ligand density and breakthrough capacities being determined under the same conditions.