Perfluorocarboxylic acids from carboxylic acids and perfluorocar

Details Perfluorocarboxylic acids from carboxylic acids and perfluorocar Perfluorocarboxylic acids from carboxylic acids and perfluorocar

1975-06-02

1977-05-10

Myers, Jane S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260408, 260537S, 260539R, 260544F, C07C 5318, C07C 5334

Patent

active

040228240

ABSTRACT:
Perfluorocarboxylic acids are produced by a metathesis reaction between an acid and a perfluoro acid fluoride (acyl fluoride). The perfluoroacyl fluoride can conveniently be produced by electrochemical fluorination of the acyl fluoride co-product of the metathesis step. As an alternate source of carboxylic acid, an acid anhydride can be cleaved with hydrogen fluoride. This also results in production of additional acyl fluoride which can be passed to an electrochemical fluorination cell to be converted to perfluoroacyl fluoride which can be recovered as product or additional free carboxylic acid can be introduced to utilize the extra perfluoroacyl fluoride to produce additional perfluoro acid.

REFERENCES:
patent: 2554219 (1951-05-01), Simons et al.
patent: 2717871 (1955-09-01), Scholberg et al.
patent: 3511760 (1970-05-01), Fox et al.
patent: 3576860 (1971-04-01), Zazaris
Kirk Othmer, Encyclopedia of Chemical Technology, 2nd Ed., vol. 9, pp. 771-775.

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