Regeneration of anion exchange resins

Abstract

A method for regenerating a strong-base anion (SBA) exchange resin containing quaternary ammonium groups, the method comprising: (i) a first washing step in which the SBA exchange resin is washed with a first aqueous solution of a salt containing a divalent or trivalent anion, wherein the salt is present in the first aqueous solution in a concentration of at least 0.001 M and up to the solubility limit of the salt; and (ii) a second washing step in which the SBA exchange resin is washed with a second aqueous solution of XCl, wherein X is H or an alkali element, wherein the XCl is present in the second aqueous solution in a concentration of 0.01 M to 2 M.

Dependencies are inferred from the claim text.