Bipolar Membrane Electrodialyzer
Bipolar membrane electrodialyzers include three-compartment bipolar membrane electrodialyzers and two-compartment bipolar membrane electrodialyzers. The three-compartment bipolar membrane electrodialyzer is suitable for converting inorganic salts into the corresponding acids and bases. The cell pair is composed of a bipolar membrane, a cation exchange membrane, an anion exchange membrane, a salt compartment, an acid compartment and an alkali compartment. Two-compartment bipolar membrane electrodialyzers are suitable for converting organic acid salts to organic acids and bases or converting organic base salts to organic bases and acids. The cell pairs consist of a bipolar membrane, a cation exchange membrane, a feed compartment and a base compartment, or a bipolar membrane, an anion exchange membrane, a feed compartment and an acid compartment.
The bipolar membrane electrodialysis process is driven by an electric field, and utilizes the characteristics of the bipolar membrane to dissociate water into H+ and OH-, to realize the conversion of salt solutions into the corresponding acids and bases. In this process, electrodes are only arranged and gas is only generated in the electrode chambers, and the operation energy consumption is low; in this process, there is no electrode reactions and no redox reactions except the electrode chambers, and no substances other than the target substance are produced.
Remark: The above data are reference values, not the performance guarantee values of the equipment, and the data in the table may change.
(1) Organic acid production: In the process of organic acid production, it is necessary to convert organic acid salts into organic acids; the traditional method adopts ion exchange, and the regeneration process of ion exchange column consumes a large amount of acid to generate a large amount of salty wastewater; bipolar membrane electrodialysis is used to dissociate water into H+ and OH-, directly producing the organic acid without adding acid and the alkali as the by-product, which simplifies the process and avoids environmental pollution.
(2) Food and pharmaceutical industry: The acid and alkali generated by the water dissociation of bipolar membrane electrodialysis are used for the on-line adjustment of pH value in the production process of the food and pharmaceutical industry, without the need for external acid and alkali, and without the introduction of foreign ingredients.
(3) Environmental protection: As a new membrane separation process, bipolar membrane electrodialysis water dissociation can convert salts in aqueous solutions into the corresponding acids and bases without introducing new components, which can provide a new way for the regeneration and recovery of certain material, reducing waste discharge and eliminating environmental pollution.
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