Production of alkali metal carbonate in a membrane cell

Details Production of alkali metal carbonate in a membrane cell Production of alkali metal carbonate in a membrane cell

C - Chemistry, Metallurgy

25

B

204/59

C25B 1/14 (2006.01)

Patent

CA 1071573

Abstract of the Disclosure An alkali metal carbonate substantially free of alkali metal chloride is efficiently produced by electrolyzing an alkali metal chloride in an electrolytic cell having anolyte and catholyte compartments separated by a cation-exchange hydraulically impermeable membrane comprised of a thin film of a fluorinated polymer having pendant sulfonate and/or sulfonamide groups and a cathode spaced apart from the membrane, injecting into the catholyte compartment of the cell carbon dioxide in a quantity sufficient to convert substantially all of the alkali metal hydroxide forming therein to the alkali metal carbonate salt, and utilizing a magnitude of electrolyzing current that reduces alkali metal chloride in the carbonate salt to less than 400 ppm.

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