Partial electrolytic dehalogenation of dichloroacetic and...

Details Partial electrolytic dehalogenation of dichloroacetic and... Partial electrolytic dehalogenation of dichloroacetic and...

C - Chemistry, Metallurgy

25

B

C25B 3/00 (2006.01) C25B 3/04 (2006.01)

Patent

CA 2042862

Abstract of the disclosure: Partial electrolytic dehalogenation of dichloroacetic and trichloroacetic acid and an electrolysis solution Trichloroacetic and dichloroacetic acid are dehalogenated to give monochloroacetic acid by electrolyzing aqueous solutions of these acids in divided electrolysis cells using carbon cathodes; the aqueous electrolysis solutions also contain one or more metal salts having a hydrogen overvoltage of at least 0.4 volt (at a current density of at least 4000 A/m2) and specific ammonium and/or phosphonium salts. In this process there is an extremely small evolution of hydrogen at the cathode, even at a very low concentration of the polychlorinated acetic acid, without the high selectivity of conversion of the electrolysis being impaired in continuous operation.

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