C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/57.1
C25B 1/34 (2006.01) C25B 1/46 (2006.01) C25B 15/08 (2006.01)
Patent
CA 1158196
ABSTRACT OF THE DISCLOSURE: In a process of electrolyzing aqueous solutions of alkali metal halides in membrane cells, pH-values above 1.0 are used in the anode chamber and the alkali metal halide solutions which have left the anode chamber are passed through zones in which they are strengthened to increase the alkali metal halide concentration and their pH value is adjusted. In order to avoid a formation of high contents of oxyacids of chlorine, which would greatly reduce the current efficiency, at least a partial stream of the strengthened solution is adjusted to a pH value below 1.0 and the pH value is then raised into the range of 1.0 to 6.0, preferably 1.0 to 2.5. The partial current amounts to 20%, at most, and is adjusted to such a pH value that the desired pH value of 1.0 to 6.0 is obtained when the partial current has been recombined with the main stream. The pH value is adjusted at a temperature above 70°C.
334282
Metallgesellschaft Aktiengesellschaft
Robic Robic & Associes/associates
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