Ion exchange membrane

Ion exchange membrane is the core spare part of ion membrane electrolyzer devices, with selective permeability. The ion exchange membrane is made from polymer material with selective permeability for ion, also called ion selective permeability membrane.
The following describes the major principles of Asahi Chemical’s ion exchange membrane chlor-alkali process.
In the ion exchange membrane process for producing caustic soda, permselective cation exchange membranes are installed between cathodes and anodes.
Electrolysis is carried out while brine is circulated in Anolyte Compartment, and caustic soda through Catholyte Compartment.

Chlorine is produced in the Anolyte Compartment, hydrogen and caustic soda are produced in the Catholyte Compartment according to the following reaction:

NaCl is ionized into Na⁺ ion and Cl^– ion. Electric charges of chloride ion are discharged at the anode to change into chlorine gas. Meanwhile, sodium ions are transferred through the ion-exchange membrane into the Catholyte Compartment.

In the Catholyte Compartment, water changes to hydrogen gas and hydroxyl ions. Caustic soda is formed by the reaction of sodium ions with hydroxyl ions.

The above main reaction is essentially the same as that of the conventional diaphragm process. But in the membrane process, pure caustic soda can be obtained due to complete separation of electrolyte and selective permeation of sodium ions.

Chlor-Alkali Bipolar electrolyzer

Membrane electrolyzer is the core equipment of chlor-alkali plant, which is mainly to produce caustic soda and chlorine gas and provide raw materials for basic chemical industry

Cell, anode and cathode, upgrading and modification

Cell is separated by a partition wall into two compartments, namely Anode compartment and cathode compartment. The inner wall of the Anode compartment is made by titanium to give resistance against chlorine and the inner wall of the cathode compartment is made by nickel to give resistance against caustic soda.

Brine Purification

In order to meet the requirement of brine qualification, impurities will be removed in primary filtration process and secondary filtration process. we can offer complete unit for primary filtration and secondary filtration process.

32% ~ 50% Alkali Evaporation and Solid Alkali

The product of ion membrane electrolyzer is 32% alkali liquid. If you need the high concentration of alkali liquid, we can provide evaporation process to remove part of the alkali water, thus to achieve concentration.

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Ion exchange membrane

Ion exchange membrane

RELATED PRODUCTS

Chlor-Alkali Bipolar electrolyzer

Chlor-Alkali Bipolar electrolyzer

Cell, anode and cathode, upgrading and modification

Cell, anode and cathode, upgrading and modification

Brine Purification

Brine Purification

32% ~ 50% Alkali Evaporation and Solid Alkali

32% ~ 50% Alkali Evaporation and Solid Alkali

Your System Supplier for Complex Solutions