Process for the production of 1,1,1-chlorodifluoroethane

Details Process for the production of 1,1,1-chlorodifluoroethane Process for the production of 1,1,1-chlorodifluoroethane

1995-06-07

1996-10-29

Siegel, Alan

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

Organic compounds

Halogen containing

570168, 570169, C07C 1708

Patent

active

055697933

ABSTRACT:
The invention relates to continuous production of 1,1,1-chlorodifluoroethane from 1,1,1-trichloroethane and hydrofluoric acid by reaction in liquid phase in the presence of at least one fluorination catalyst. According to the invention, the process is carried out under an absolute pressure of between 6 and 30 bars and at a temperature of between 50.degree. and 120.degree. C., the content of catalyst(s) in the reaction mixture, expressed as a percentage by weight of metal, being between 0.05 and 10% and the content of organohalogenated by-products not belonging to series 140 in the reaction mixture being controlled at a value below 40% by weight. This process makes it possible, at the same time, to obtain a high degree of conversion of hydrofluoric acid, to minimize the coproduction of 1,1,1-trifluoroethane and organohalogenated by-products and to facilitate the recovery of the hydrochloric acid formed.

REFERENCES:
patent: 4091043 (1978-05-01), Ohsaka et al.
patent: 4849555 (1989-07-01), Cheminal et al.
J. Soc. Chem Ind vol. 66 pp. 427-429 (1947) Whalley.
Chemicals Abstract, vol. 82, 1975, p. 468, No. 111560v.
Chemical Abstracts, vol. 85, 1976, p. 593, No. 123323v.

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