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Rechargeable electrochemical cells

An electrochemical and recharging technology, applied in the field of electrochemical batteries, which can solve problems such as module failures

Inactive Publication Date: 2014-04-16
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For all but very low inlet TDS contents, this concentration causes rapid precipitation of salts at the diaphragm surface, leading to failure of the module
This technical shortcoming has so far inhibited the adoption of EDI for broad consumer and commercial benefit

Method used

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  • Rechargeable electrochemical cells
  • Rechargeable electrochemical cells
  • Rechargeable electrochemical cells

Examples

Experimental program
Comparison scheme
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example 1

[0055] An electrochemical cell was prepared containing 250 cc of resin in a single product compartment defined by two ion exchange membranes. Two concentrate compartments are each formed by one of the electrodes (anode or cathode) and one of the two ion exchange membranes. The battery also has a power source capable of supplying a constant or randomly pulsed voltage across the electrodes. Conductivity, resistivity and pH probes will be provided for automatic monitoring of TDS and pH of the water upstream and downstream of the product and concentrate compartments of the cell. A digital pump will provide controlled flow through each of the compartments.

[0056] In the absence of any current being supplied to the cell, a simulated maintenance cycle, initiated with municipal inlet water flowing into the product compartment and contacting the resin, was loaded until depleted, as indicated by an increase in the conductivity of the product water. The recharge cycle will then be pe...

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Abstract

Provided are electrochemical devices that are rechargeable, wherein the regeneration techniques are based on a batch-wise application of current or current density to the cells, wherein there are a service mode where no current or current density is applied and a recharge mode where a current or current density is applied. Electrochemical and EDI systems according to the embodiments herein are suitable for deionization and / or purification of typical municipal tap quality water in applications where demand for purified, low-TDS water is intermittent. Such operations avoid the use of chemical additions for regeneration purposes. In addition the cells provided herein are amenable to small footprints for consumer and commercial applications such as: dishwashers, washing machines, coffee and espresso makers, ice makers, steam tables, car wash water sources, and steamers.

Description

technical field [0001] The present invention relates to the field of electrochemical cells for purifying water and methods of their use, and more particularly, the present invention relates to the field of electrochemical cells that are rechargeable and minimize scale build-up, such cells being useful in water deionization and / or Or the preparation of water with reduced hardness due to alkalinity. Background technique [0002] Salts dissolved in freshwater sources, measured as water hardness or total dissolved solids (TDS), create significant problems in industrial, commercial, and residential water use, and methods for removing these salts have long been practiced. As human freshwater use intensifies, our water sources are increasingly becoming saline solutions for a number of reasons: agricultural runoff; urban runoff containing road anti-icing salts; overpumping of groundwater leading to seawater intrusion into aquifers; and Extraction of brackish water for human consump...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F1/42B01J47/08B01J47/12B01J49/00A47J37/00
CPCC02F2103/02C02F2307/12C02F1/42C02F2001/427C02F2201/006C02F1/4695A47L15/4238B01D65/08C02F2209/40B01D2321/226C02F2201/46175B01D2313/48C02F2301/024C02F2001/425C02F2209/055B01D61/445B01J47/08C02F2201/007C02F1/4602D06F35/003C02F2303/16A47J37/00B01D61/48B01D2315/14C02F2303/22C02F2201/46115C02F2201/4614C02F2209/06C02F2001/422B01J47/12B01D2313/44B01D2321/2008C02F2201/46145B01D2315/18C02F2209/05B01D2321/22B01J49/0052C02F2201/4611B01D61/54B01J47/024B01J47/011B01J49/30C02F1/469B01D61/42C02F5/00C02F2201/002C02F2307/10
Inventor R·E·阿瑟尔J·F·赫斯特郑滇
Owner 3M INNOVATIVE PROPERTIES CO