ELECTROLYSIS OF ALKALI METAL CHLORIDE

摘要

Alkali metal hydroxide is produced by electrolysis of alkali metal chloride according to an improved diaphragm process wherein plural cationic ion-exchange membranes are used to divide an electrolytic cell into an anode compartment, at least one middle compartment and a cathode compartment. The ion-exchange membrane confronting the anode is preferably substantially resistant to anodic reaction products such as chlorine or chlorates. Alkali formed by electrolysis is recovered from the cathode compartment or alternatively may be taken from one or more middle compartments at various concentrations. Alkali metal hydroxide can be produced in high purity and high concentration with excellent efficiency.