The technique of mother liquor of chloroacetic acid coproduction Thiovanic acid and dichloro acetic acid and a device thereof the by-product mother liquor that utilizes production of chloroacetic acid is raw material after distillation separates acetic acid contained in mother liquor and low-boiling point material by Ca for mother liquor (OH)2aqueous solution neutralization.In neutralizer add a certain amount of thiourea solution reaction.Reaction solution is separated with whizzer main containing dichloro acetic acid calcium and calcium chloride in filtrate filtrate is used to concentrated hydrochloric acid acidifying then use organic solvent extraction.Organic phase obtains dichloro acetic acid after falling-film evaporator is removed solvent.S-carboxymethyl isothiourea reacts with hydrated barta and centrifugation obtains Thiovanic acid precipitated barium and this white precipitate is dissolved with hcl acidifying with removing solvent through falling-film evaporator again after organic solvent extraction obtains Thiovanic acid.This technique not only technique is simple and industrial production cost is low and can obtain two kinds of fine chemical products that added value is higher has greatly improved the utility value of mother liquor of chloroacetic acid.

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