Patent ID: 6623644
Filing Date: 2003-09-23
Classification: B01J

Abstract:
A method for removing, separating, or concentrating selected ions from a source solution comprising the steps of:(a) contacting said source solution with a polyamide ligand-containing polymeric resin which is a reaction product of a hydroxymethylated polyamide ligand and one or more agents selected from the group consisting of polymerization agents, and crosslinking agents, said polymeric resin being comprised of from 10 to 50,000 polyamide ligand units, and wherein said polymeric resin has an affinity for said selected ions such as to form a complex between said selected ions and said polymeric resin; (b) removing the source solution from contact with said polymeric resin to which said selected ions have been complexed; and (c) contacting said polymeric resin having said selected ions complexed thereto with a smaller volume of an aqueous receiving solution in which said selected ions are either soluble, or which has greater affinity for such selected ions than does the polymeric resin, thereby quantitatively stripping such selected ions from the ligand and recovering said selected ions in concentrated form in said receiving solution.