FIELD: chemical industry. SUBSTANCE: original mixture is treated with sufficiently strong acid in aqueous solution, fluorinated carboxylic acid is optionally isolated and subsequently treated with suitable alcohol and the resulting ester is distilled off, and the resulting product is optionally saponified with ammonia solution to ammonium salt of fluorinated carboxylic acid. EFFECT: simplified process and higher purity of the desired product. 6 cl, 4 ex
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