FIELD: electrochemical production of alkalies. SUBSTANCE: saturated solution of oxygen-containing cesium or rubidium salt, preferably nitrate, undergoes a circulatory-mode electrodialysis in a three- cell electrodialyser, whose middle cell is separated from anode and cathode cells with, respectively, anione-selective and carboxyl- type cation-selective membranes, ratio of anolyte and catolyte streams being maintained equal to (1-3): 1. EFFECT: increased high- purity alkali and acid yields; improved environmental safety. 1 tbl
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