| abstract |
Provided is a method for recovering a fluorine-containing carboxylate used as an emulsifier for a copolymerization reaction from a fluorine-containing copolymer aqueous polymerization emulsion as a fluorine-containing carboxylic acid very efficiently. An aqueous polymerization emulsion of a fluorine-containing copolymer containing a fluorine-containing carboxylate emulsifier is added to a lower alcohol to coagulate the fluorine-containing copolymer, and after separating it, from the liquid phase After distilling off water and lower alcohol and concentrating to 30% or less of the initial volume or completely evaporating to dryness, a strong inorganic acid is added and recovered as a fluorinated carboxylic acid corresponding to the fluorinated carboxylate. [Selection figure] None |