Patent ID: 7338600
Filing Date: 2008-03-04
Classification: B01D,B01J,C02F

Abstract:
1. An improved electrodeionization stack, wherein a flow path comprises a first stage and a second stage, wherein said first stage comprises a first set of electrodes and said second stage comprises a second set of electrodes, wherein said first set of electrodes has a first voltage and said second set of electrodes has a second voltage, and wherein said second voltage is greater than said first voltage, and wherein said first stage is mechanically and electrically separated from said second stage, said electrodeionization stack having a plurality of membranes in each of said first stage and said second stage, wherein at least one cationic membrane and at least one anionic membrane are used across said first stage and said second stage, and wherein said at least one anionic membrane and at least one cationic membrane are insulated between said first stage and said second stage.