Method of preparing 1,1,1-trifluoro-2,2-dichloroethane from trif

Details Method of preparing 1,1,1-trifluoro-2,2-dichloroethane from trif Method of preparing 1,1,1-trifluoro-2,2-dichloroethane from trif

1988-10-11

1990-03-20

Evans, J. E.

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

Organic compounds

Halogen containing

570180, C07C 1724, C07C 1738, C07C 1902

Patent

active

049103520

ABSTRACT:
CF.sub.3 CHCl.sub.2 is easily obtained at good yield by reduction of CF.sub.3 CCl.sub.3 in an aqueous solution of Na.sub.2 SO.sub.3 and an acid acceptor such as hydroxide, carbonate or acetate of an alkali metal or alkaline earth metal. Usually the reduction reaction is carried out at 60.degree.-150.degree. C. under gauge pressure of 0-10 kg/cm.sup.2. The aimed compound can easily be recovered by separating the reaction liquid into organic and aqueous layers, and the waste aqueous solution contains no compound difficult to dispose of.

REFERENCES:
patent: 4145368 (1979-03-01), Sweeney et al.
Madai et al., "Chem. Abstracts", vol. 58 (1963) 11200h.
"Chemistry in Hydrogen Fluoride V. Catalysts for Reaction of Halogenated Olefins", by A. E. Feiring, Journal of Fluorine Chemistry, 13 (1979), pp. 7-18.

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