Bipolar membrane electrodialysis device and operation method thereof

By including the salt to be decomposed in the acid and/or alkali liquid of the bipolar membrane electrodialysis device and adjusting the electrodialysis conditions, the problems of low current efficiency and scale precipitation in the carbon recovery process of the bipolar membrane electrodialysis device are solved, and the effect of high current efficiency and long-term operation stability is achieved.

CN119768374APending Publication Date: 2025-04-04SUMITOMO OSAKA CEMENT CO LTD +2
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Patent Information

Application Number
CN202380061593.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2022-09-07
Filing Date
2023-09-06
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

Bipolar membrane electrodialysis devices are difficult to achieve a current efficiency of more than 90% in the carbon recovery process, and because divalent cations precipitate scale in the cation exchange membrane, the mobility of cations decreases and the driving voltage increases.

Method used

By including the salt to be decomposed in the acid and/or alkali liquid of the bipolar membrane electrodialysis device, the electrodialysis conditions are adjusted to improve current efficiency and to inhibit the precipitation of scale into the cation exchange membrane.

Benefits of technology

The current efficiency is improved, especially above 90%, and the operation is stable in the use of 1ppm Ca concentration brine, which avoids the precipitation of scale and reduces the driving voltage.

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Abstract

Provided are: a bipolar membrane electrodialysis device which has high current efficiency and in which the precipitation of scale into a cation exchange membrane due to divalent cations is suppressed; and a method for operating the bipolar membrane electrodialysis device. This method for operating a bipolar membrane electrodialysis device uses a bipolar membrane electrodialysis device comprising a bipolar membrane, a cation exchange membrane, and an anion exchange membrane, and generates an acid and a base from brine. Electrodialysis is performed while the salt to be decomposed is contained in the acid solution and / or the alkali solution.
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