Process for purifying resins utilizing bipolar interface

A process for purifying anion exchange resin particles and cation exchange resin particles containing less than about 1% and 0.1% ionic impurities respectively other than hydroxyl ion or hydrogen ion which comprises:

• providing a water stream having a purity of at least about 1 megohm-cm,
• passing said water stream through ion depletion compartments containing said resin particles in an electrodeionization apparatus, said electrodeionization apparatus comprising:
• a cathode compartment at a first end of said apparatus,
• an anode compartment at an end of said apparatus opposite said first end,
• a plurality of sets of an anion depletion compartments and cation depletion compartments alternating with ion concentration compartments positioned between said cathode compartment and said anode compartment,
• each anion depletion compartment and each cation depletion compartment being separated by a bifunctional interface,
• passing a second liquid for accepting ions from said water stream through said concentration compartments while said water stream is passed through said anion depletion compartments and said cation depletion compartments,
• applying an electrical voltage between an anode in said anode compartment and a cathode in said cathode compartment,
• recovering purified water from said depletion compartments, and recycling purified water to said anion depletion compartments and said cation depletion compartments for a sufficient time period to form purified ion exchange resin particles in said anion depletion compartments and said cation depletion compartments,
• and recovering said purified resin particles.