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Electrodialysis semipermeable membrane

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Electrodialysis semipermeable membrane

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During the electrodialysis process, unlike ion exchange resins that undergo exchange reactions with certain ions in the aqueous solution, ion exchange membranes only exert a selective permeation effect on ions with different electrical properties. That is to say, ion exchange membranes do not require regeneration. The compartments composed of electrodes and membranes in the electrodialysis process are called electrode compartments, and the electrochemical reactions occurring therein are the same as ordinary electrode reactions. An oxidation reaction takes place in the anode compartment, making the anode water acidic, and the anode itself is prone to corrosion. A reduction reaction occurs in the cathode compartment, making the cathode water alkaline, and scaling easily forms on the cathode.

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Overview

- Commodity name: Electrodialysis semipermeable membrane
During the electrodialysis process, unlike ion exchange resins that undergo exchange reactions with certain ions in the aqueous solution, ion exchange membranes only exert a selective permeation effect on ions with different electrical properties. That is to say, ion exchange membranes do not require regeneration. The compartments composed of electrodes and membranes in the electrodialysis process are called electrode compartments, and the electrochemical reactions occurring therein are the same as ordinary electrode reactions. An oxidation reaction takes place in the anode compartment, making the anode water acidic, and the anode itself is prone to corrosion. A reduction reaction occurs in the cathode compartment, making the cathode water alkaline, and scaling easily forms on the cathode.

Electrodialysis Membrane Properties and Process Reactions

The semipermeable membranes used in electrodialysis are actually a type of ion exchange membrane. Based on the charge property of ions, these ion exchange membranes can be divided into two categories: cation exchange membranes (cation membranes) and anion exchange membranes (anion membranes). In an aqueous electrolyte solution, cation membranes allow cations to pass through while repelling and blocking anions, and anion membranes allow anions to pass through while repelling and blocking cations—this is the selective permeability of ion exchange membranes.

During the electrodialysis process, unlike ion exchange resins that undergo exchange reactions with certain ions in the aqueous solution, ion exchange membranes only exert a selective permeation effect on ions with different electrical properties. That is to say, ion exchange membranes do not require regeneration. The compartments composed of electrodes and membranes in the electrodialysis process are called electrode compartments, and the electrochemical reactions occurring therein are the same as ordinary electrode reactions. An oxidation reaction takes place in the anode compartment, making the anode water acidic, and the anode itself is prone to corrosion. A reduction reaction occurs in the cathode compartment, making the cathode water alkaline, and scaling easily forms on the cathode.