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Method and apparatus for shifting current distribution in electrodeionization systems

A technology for electrodeionization and equipment, applied in the field of improved electrodeionization systems

Active Publication Date: 2009-06-10
BL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the current state of the art, especially for the problems and needs that have not been completely solved by utilizing the existing EDI equipment in the prior art, the present invention is made

Method used

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  • Method and apparatus for shifting current distribution in electrodeionization systems
  • Method and apparatus for shifting current distribution in electrodeionization systems
  • Method and apparatus for shifting current distribution in electrodeionization systems

Examples

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Embodiment 1

[0035] Add NaHCO containing NaHCO with a total exchangeable cation (TEA) concentration of 20ppm 3 Aqueous solution (such as CaCO 3 Also contains 250ppb SiO 2 ) into a conventional EDI assembly as shown in Figure 2A. In this Example 1, it was found that the fluid exiting the fresh water chamber 20 contained about 15-18 ppb residual SiO 2 . The entire fresh water chamber 20 is measured, and the current distribution of zones 1-4 is shown in FIG. 2A, wherein the current distribution is as follows: zone 1=11%; zone 2=18%; zone 3=30%; zone 4=41%. It can be seen that about 71% of the current is distributed near the outlet half of the freshwater chamber (i.e., zones 3 and 4), compared to about 29% of the current distributed in the inlet half of the freshwater chamber (i.e., zones 1 and 2). Area). The unbalanced current distribution biased towards the outlet area of ​​the fresh water chamber indicates that most of the current passing through the fresh water chamber is used to remo...

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Abstract

An electrodeionization (EDI) apparatus and method comprising an ion-depleting chamber for removing ions from liquids passed therethrough, wherein a resistive component is coupled proximate the outlet region of the chamber so as to increase the electrical resistance of the outlet region of the chamber with respect to the inlet region of the chamber. The resistive component may be coupled to the ion-selective membranes bordering the diluting chamber and / or the concentrate chambers. In an alternative embodiment, the resistive component may be coupled between the ion-exchanging media particles themselves within the ion-depleting chambers. In each embodiment, the electrical resistance of the outlet region is increased with respect to the inlet region of the chamber, with results being that electrical current is shifted from the outlet region toward the inlet region, thus enhancing overall deionization performance of the EDI device.

Description

technical field [0001] The present invention relates generally to improved electrodeionization systems and, more particularly, to electrodeionization systems and methods that alter the conductivity of specific regions in a resin bed to improve the deionization process. Background of the invention [0002] Electrodeionization (EDI) systems are used to remove ions from liquids, especially water. These systems require power supplies that apply voltage to EDI components to purify industrial water to ultra-high purity for use in power, microelectronics, food, chemical, pharmaceutical, and other industries. [0003] In an exemplary electrodeionization device, electrical current is passed through a bed of ion exchange resin. Resin beds are contained on either side perpendicular to the flowing current through an ion exchange membrane. Electric current flows through the solution and ion-exchange microspheres through the resin bed via ion migration, and ionization of water occurs at...

Claims

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Application Information

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IPC IPC(8): B01D61/48C02F1/469B01D61/54
CPCB01D61/48B01D2313/30C02F2201/46115C02F1/4695B01D61/54B01D2313/34B01D2325/26B01D2313/28C02F2209/05C02F2201/46125C02F1/469
Inventor 约翰·巴伯
Owner BL TECH INC
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