| abstract |
The invention discloses a preparation method of a fluorine-containing carboxylic acid. The method takes a fluorine-containing carboxylic acid salt as a raw material, reacts with an acid chloride reagent to obtain a corresponding mixture of a fluorine-containing acid chloride and a fluorine-containing acid anhydride, and then converts the fluorine-containing acid chloride The mixture with fluorine-containing anhydride is hydrolyzed and dried to prepare high-purity fluorine-containing carboxylic acid. The method of the invention is suitable for the post-treatment of fluorine-containing olefins (mono-olefins, di-olefins, cyclic olefins, etc.) to prepare fluorine-containing carboxylic acids by oxidation method, instead of the traditional strong acid acidification and diethyl ether continuous extraction process, and is more convenient and applicable; it can also be used for recycling And purified fluorine-containing carboxylate emulsifier. The purity of the fluorine-containing carboxylic acid prepared by the invention can reach more than 98%. |