E.i. Dupont De Nemours and Company

Daikin Industries, Ltd.

Ta-Wei Fu

Steven Henry Swearingen

Takuya Ichida

Clay Woodward Jones

Velliyur Nott Rao

Shuji Itatani

Shigeyuki Yoshii

Shuji Daikin Industries Ltd Itatani

Takuya Daikin Industries Ltd Ichida

A fluorocarboxylic acid preparation process which includes hydrolyzing fluorocarboxylic acid fluoride in the presence of an aqueous sulfuric acid solution to form a reaction product containing a fluorocarboxylic acid and hydrogen fluoride (present as hydrofluoric acid); and removing at least some of the hydrogen fluoride from the reaction product by washing the reaction production with aqueous sulfuric acid solution. The hydrolyzing and washing are carried out at a temperature at which the fluorocarboxylic acid is a liquid.

Process for preparing fluorocarboxylic acids

A fluorocarboxylic acid preparation process continuously carries out acidification reaction treatment and washing treatment, and includes subjecting a fluorocarboxylate-containing aqueous solution to acidification reaction treatment in the presence of sulfuric acid so as to form a sulfate-containing fluorocarboxylic acid phase; and subjecting the fluorocarboxylic acid phase to washing treatment using an aqueous sulfuric acid solution.

Fluorinated carboxylic acid, used as a surfactant in fluoropolymerization in aqueous media, can be recovered by scrubbing from the exhaust gas of the dryer during polymer drying and, after concentration and treatment with alumina, directly reused in fluoropolymerization in aqueous media.

Fluorinated carboxylic acid recovery and reuse

A process for preparing a hydrochlorofluorocarbon essentially free of olefinic impurities by selectively hydrogenating the olefinic impurities. The process may be controlled such that at least a portion of the hydrochlorofluorocarbon is converted into a fluorohydrocarbon.

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Ta-Wei Fu