Process for the recovery of fluorinated carboxylic acids

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters

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C07C 6963

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active

054420970

ABSTRACT:
Fluorinated carboxylic acids can be recovered from materials which contain them by releasing, if necessary, the carboxylic acids with sufficiently strong acids, esterifying the released acids and distilling off the esters. The esters can be advantageously directly hydrolyzed with aqueous ammonia solution to give the corresponding ammonium salts.

REFERENCES:
patent: 4038231 (1977-07-01), Downer et al.
patent: 4391940 (1983-07-01), Kuhls et al.
patent: 4639497 (1987-01-01), Knight et al.
patent: 4730082 (1988-03-01), Amiet
"Some physical properties of n-alkyl trifluoroacetates" Jeffery et al; J. Appl. Chem., 10, Jan., 1960.
Patent Abstracts of Japan, vol. 14, No. 137, p. 702 (Mar. 15, 1990).

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