- Production process of fluorine-containing carboxylic acid
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The invention discloses a production process of fluorine-containing carboxylic acid. The method comprises the following steps: by taking fluorine-containing olefin as a raw material, carrying out an oxidation reaction to obtain fluorine-containing carboxylate, reacting the fluorine-containing carboxylate with an acylating chlorination reagent to obtain a corresponding mixture of fluorine-containing acyl chloride and fluorine-containing acid anhydride, and hydrolyzing and drying the mixture of fluorine-containing acyl chloride and fluorine-containing acid anhydride to prepare the high-purity fluorine-containing carboxylic acid. The method provided by the invention is suitable for post-treatment of fluorine-containing carboxylic acid prepared by a fluorine-containing olefin (monoolefine, diene, cycloolefin and the like) oxidation method, replaces the traditional strong acid acidification and ether continuous extraction process, and is simpler, more convenient and more applicable; the purity of the fluorine-containing carboxylic acid prepared by the method can reach 98% or above.
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Paragraph 0049-0051
(2020/07/13)
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- FLUORINATED ETHER COMPOUNDS AND METHODS OF USING THE SAME
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Compounds represented by formula (Rf-Q-X)s-Z. Each Rf is independently a partially fluorinated or fully fluorinated group selected from Rfa-(O)r-CHF-(CF2)n-; [Rfb-(O)t-C(L)H-CF2-O]m-W-; CF3CFH-O-(CF2)p-; CF3-(O-CF2)z-; and CF3-O-(CF2)3-O-CF2-. Methods of reducing surface tension of a liquid, making foams, and treating a surface using the compounds are also disclosed.
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Page/Page column 31
(2010/04/03)
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