Method for the preparation of difluoromethane

Details Method for the preparation of difluoromethane Method for the preparation of difluoromethane

1995-03-02

1996-02-27

Siegel, Alan

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

Organic compounds

Halogen containing

C07C 1708

Patent

active

054950570

ABSTRACT:
There is disclosed a method for the preparation of difluoromethane wherein methylene chloride is reacted with. hydrogen fluoride in liquid phase, at a temperature of about 70.degree. to 90.degree. C. under a pressure of about 11 to 12 kg/cm.sup.2.g in the presence of antimony pentachloride. It is important that the concentration of quinquevalent antimony is maintained at a level of 85% or more with the feed mole ratio of hydrogen fluoride to methylene chloride ranging from about 2.0 to 2.3.
Applicable to industrial scale, the method is operated in a batch system or in a continuous system. In addition, it exhibits superior conversion rate of the materials and production yield.

REFERENCES:
patent: 2005713 (1935-06-01), Hoh
patent: 2749375 (1956-06-01), Ruh et al.

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