Process for preparing fluorocarboxylic acids
AssigneesE.I. duPont de Nemours and Company, Daikin Industries, Ltd.
InventorsTa-Wei Fu, Steven H. Swearingen, Takuya Ichida, Shuji Itatani
Life of this patent
Estimating the term…
Abstract
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.
Claims13
A process for preparing fluorocarboxylic acid in which acidification reaction treatment and washing treatment are continuously carried out, the process comprising:
- 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,
- wherein said acidification and said washing are carried out at a temperature at which said fluorocarboxylic acid is a liquid.
A process for preparing fluorocarboxylic acid in which acidification reaction treatment and washing treatment are carried out, the process comprising:
- 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,
- wherein said acidification and said washing are carried out at a temperature at which said fluorocarboxylic acid is a liquid, and at least one of said acidification reaction treatment and washing treatment is carried out batchwise.
A process for preparing fluorocarboxylic acid in which acidification reaction treatment and washing treatment are carried out, the process comprising:
- 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,
- wherein said acidification and said washing are carried out at a temperature at which said fluorocarboxylic acid is a liquid, and at least one of said acidification reaction treatment and washing treatment is carried out continuously.
Dependencies are inferred from the claim text.