Electrolysis of aqueous solution of sodium chloride

Details Electrolysis of aqueous solution of sodium chloride Electrolysis of aqueous solution of sodium chloride

C - Chemistry, Metallurgy

25

B

204/64.3

C25B 1/20 (2006.01) C01D 3/14 (2006.01) C08J 5/22 (2006.01) C25B 1/46 (2006.01)

Patent

CA 1141696

ABSTRACT OF THE DISCLOSURE Electrolysis of an aqueous solution of sodium chloride is carried out employing a fluorinated cation exchange membrane having an ion-exchange capacity of 0.8 to 2.0 meq/g dry polymer and having carboxylic acid groups as functional groups and main- taining the concentration of an aqueous solution of sodium hydroxide in the cathode compartment in the range of 20 to 45 wt. % and maintaining the calcium concentration in the aqueous solution of sodium chloride lower than 0.08 mg/liter. The purification of the aqueous solution of sodium chloride to reduce the calcium concentration is carried out in a system comprising first and second chelate ion-exchange towers which are connected through a detector for detecting impurities in the aqueous solution. The electrolyses may be carried out at low voltage, high current efficiency and under stable condi- tions over a long period of time and is thus a satisfactory process on an industrial scale.

302281

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