Acid anhydride to react with impurities in the production of per

Details Acid anhydride to react with impurities in the production of per Acid anhydride to react with impurities in the production of per

1976-03-11

1977-07-26

Myers, Jane S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

204 59F, 260408, 260537S, 260539R, 260544F, C07C 5318, C07C 5334

Patent

active

040383105

ABSTRACT:
Perfluorocarboxylic acids are produced by a metathesis reaction between an acid and a perfluoro acid fluoride in the presence of an acid anhydride. The perfluoroacid fluoride can conveniently be produced by electrochemical fluorination of the acyl fluoride co-product of the metathesis step. The acid anhydride present during the metathesis reaction serves the dual function of enhancing the desired reaction to produce the perfluorocarboxylic acid product and to react with impurities and by-products which would otherwise remain with the product and complicate its recovery.

REFERENCES:
patent: 3213062 (1965-10-01), Ellingboe et al.
patent: 3318950 (1967-05-01), Christoph et al.
patent: 3576860 (1971-04-01), Zazaris
Simmons, Chemical Reviews, vol. 8, p. 213 (1931).

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