Patent ID: 8066860
Filing Date: 2011-11-29
Classification: B01D,C02F

Abstract:
1. An electrodeionization apparatus comprising: an ion-concentrating compartment having opposed side surfaces at least partially bounded by an anion permeable membrane on one side surface and at least partially bounded by a cation permeable membrane on the other side surface; and a first ion exchange material domain disposed within the ion-concentrating compartment, wherein the first ion exchange material domain is contiguous with at least a portion of the ion-concentrating compartment side surface of one of the anion permeable membrane and the cation permeable membrane, and is spaced apart from the other one of the one of the anion permeable membrane and the cation permeable membrane; wherein the at least a portion of the ion-concentrating compartment side surface of the one of the anion permeable membrane and the cation permeable membrane defines an operative side surface fraction of the ion-concentrating compartment side surface of the one of the anion permeable membrane and the cation permeable membrane; such that, in the case where the one of the anion permeable membrane and the cation permeable membrane, having the at least a portion of an ion-concentrating compartment side surface with which the first ion exchange material domain is contiguous, is an anion permeable membrane, the first ion exchange material domain is an anion exchange material predominant domain; and in the case where the one of the anion permeable membrane and the cation permeable membrane, having the at least a portion of an ion-concentrating compartment side surface with which the first ion exchange material domain is contiguous, is a cation permeable membrane, the first ion exchange material domain is a cation exchange material predominant domain.