Purified amphoteric ion exchange resins and a process for their purification.

摘要

Purified resin particles are provided in an electrodeionization step for purifying resin particles having ion depletion compartments containing the resin particles and ion concentration compartments. Purified water having a purity of at least 1 megohm-cm is introduced into the ion depletion compartments and water for accepting ionic impurities is introduced into the ion concentration compartments. The electrodeionization step for purifying resin particles is conducted under condition to dissociate water into hydrogen ions and hydroxyl ions. The purified water is produced in an initial water purification step which also can be an electrodeionization step. The water effluent from the ion depletion compartment can be recycled either to the initial water purification step or to the inlets of the ion depletion compartments in the resin particle purification process. The electrodeionization step comprising the initial water purification step is conducted under conditions to minimize or prevent hydrogen ion and hydroxyl ion formation.