Layered electrodeionization device with discreet cation chamber

摘要

The present invention relates generally to the deionization of liquids through the use of electrodeionization methods and apparatuses. The apparatuses are configured to produce purified liquids having an ion content at a level of parts-per-trillion or less, and to provide continuous regeneration of the ion exchange materials. The apparatuses may be configured according to the desired levels of deionization for anions, cations, or both. Finally, methods are presented for various uses of the claimed apparatus.

主权项

1. An electrodeionization apparatus comprising:
a. an anode chamber 601, including an anode therein; b. a cathode chamber 608, including a cathode therein;
i. wherein, an electric field is formed as a result of a voltage applied between the anode and the cathode; c. an anion membrane 602 contiguous with the anode chamber 601; d. a dual layer depletion chamber comprising:
i. an anion exchange material layer 603 contiguous with the anion membrane 602, the anion exchange material layer including therein anion exchange materials;ii. a composite anion-cation exchange material layer 604 contiguous with the anion exchange material layer 603, the composite anion-cation exchange material layer including therein one of a mixed ion exchange material, or a doped anion exchange material, or a doped cation exchange material;iii. wherein an interface between the anion exchange material layer 603 and the composite anion-cation exchange material layer 604 is substantially transverse to the applied electric field, so that a direction of fluid flow across the interface is substantially perpendicular to the interface; e. a first cation membrane 605 is contiguous on a first side of the composite anion-cation exchange material layer 604 of the dual layer depletion chamber; f. a cation exchange material layer 606 is contiguous on a second side of the first cation membrane 605, the cation exchange material including therein cation exchange materials; g. a second cation membrane 607 is contiguous with the cation exchange material layer 606 on a first side and is contiguous with the cathode chamber 608 on a second side, wherein an initial input port for feed to the apparatus is placed at a location such that feed enters into the cation bed 606 at a location in close proximity to cation membrane 607.