| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for extremely efficiently recovering a fluorine-containing carboxylate, as a fluorine-containing carboxylic acid, useful as an emulsifying agent for a copolymerization reaction from an aqueous emulsified liquid of a fluorine-containing copolymer. SOLUTION: The recovery method comprises adding an aqueous emulsified liquid of a fluorine-containing copolymer containing an emulsifying agent of a fluorine-containing carboxylate to a lower alcohol to coagulate a fluorine-containing copolymer, separating the fluorine-containing copolymer, distilling away water and the lower alcohol from the liquid phase, concentrating the solution up to≤30% initial volume or evaporating the solution completely to dryness, then adding an inorganic strong acid to the concentrated solution or the solid residue to recover a fluorine-containing carboxylic acid corresponding to the fluorine-containing carboxylate. COPYRIGHT: (C)2007,JPO&INPIT
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