Central Glass Company, Limited

Kiyoshi Yagii

Hideki Oshio

Satoshi Yoshikawa

Katsuyoshi Murata

Sadaharu Mishumi

1,1,1,2-Tetrafluoroethane, a refrigerant, is formed with little formation of isomers or chlorofluoroethanes having not very different boiling points by reacting 1,1-dichloro-1,2,2,2-tetrafluoroethane (R-114a), which may contain up to about 25 wt% of 1,2-dichloro-1,1,2,2-tetrafluoroethane (R-114), with hydrogen gas in the presence of a palladium-on-active alumina catalyst at a temperature lower than 200.degree. C. and not lower than 120.degree. C. R-114a almost free of R-114 is obtained by reacting 1,1,1-trichloro-2,2,2-trifluoroethane with hydrogen fluoride in vapor phase in the presence of a catalyst prepared by partially fluorinating .gamma.-alumina by treatment with hydrogen fluoride gas.

Method of preparing 1,1,1,2-tetrafluoroethane from

A halogenated hydrocarbon such as a halogenated ethane or propane is dehalogenated by subjecting to electrolysis an aqueous reaction system containing the halogenated hydrocarbon, a halide of metal having dehalogenating ability and a detergent. The detached halogen leaves the reaction system in elemental form.

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Fujimi, Japan

Kiyoshi Yagii