Method of preparing trifluoromethanesulfonic acid anhydride

Details Method of preparing trifluoromethanesulfonic acid anhydride Method of preparing trifluoromethanesulfonic acid anhydride

1990-04-09

1991-04-02

Bascomb, Wilbur

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfonic acids or salts thereof

562872, 203 35, 203 38, 203 73, 203 79, 203 80, 203 85, 203 92, 203DIG6, 203DIG25, B01D 334, C07C30300, C07C30344

Patent

active

050048295

ABSTRACT:
(CF.sub.3 SO.sub.2).sub.2 O is formed by reaction of CF.sub.3 SO.sub.3 H with P.sub.2 O.sub.5 and taken out of the reaction system by distillation, but the residue of the distillation contains a considerable amount of unreacted CF.sub.3 SO.sub.3 H. From the residue unreacted by adding water or a phosphoric acid solution, preferably the latter, to the residue to obtain a fluidic mixture containing an adequate amount of water and subjecting the mixture to distillation, preferably under reduced pressure at temperatures ranging from 180.degree. to 280.degree. C. It is possible to form additional CF.sub.3 SO.sub.3 H during the recovery process by adding a metal salt of CF.sub.3 SO.sub.3 H to the aformentioned mixture since the metal salt is decomposed by phosphoric acid contained in the mixture.

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patent: 4167525 (1979-09-01), Kataoka et al.
patent: 4925975 (1990-05-01), Aramaki et al.
J. Chem. Soc. (1957), by J. Burdon et al., pp. 2574-2578.

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