Patent ID: 8293115

Claim:
A process of purifying a target ionic species from a mixture of the target ionic species and an accompanying non-target anionic species comprising the steps of: providing a mixture of a target ionic species and a non-target ionic specie; providing a weakly ionic resin, that has prime loading selectively for the target ionic species and less loading selectivity for the non-target ionic specie; loading the weakly ionic resin with the mixture of the target ionic species and a non-target ionic specie; further loading the weakly ionic resin with the target ionic species to displace to almost complete exclusion of the less selectively loaded ionic species through displacement in a pre-elution step; and eluting the target anionic species by a stoichiometrically efficient elution harvesting using a chemical base to produce a pure stream of target ionic species having an almost completely excluded the less selectively loaded ionic specie.