Production of alkali metal carbonates in a cell having a...

Details Production of alkali metal carbonates in a cell having a... Production of alkali metal carbonates in a cell having a...

C - Chemistry, Metallurgy

25

B

204/59

C25B 1/14 (2006.01) C08J 5/22 (2006.01)

Patent

CA 1123780

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 carboxylic acid or alkali metal carboxylate groups and a cathode spaced apart from the membrane; introducing carbon dioxide into the catholyte in a quantity sufficient to convert substantially all the alkali metal hydroxide therein to alkali metal car- bonate; and utilizing a magnitude of electrolyzing current that reduces alkali metal chloride in the catholyte solids to less than 400 ppm.

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