Method of producing difluoromethane

Details Method of producing difluoromethane Method of producing difluoromethane

2005-01-11

2005-01-11

Price, Elvis O. (Department: 1621)

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

Organic compounds

Halogen containing

C570S165000, C570S166000, C570S168000, C570S169000, C570S170000

Reexamination Certificate

active

06841705

ABSTRACT:
A method of producing difluoromethane (HFC-32), which includes firstly reacting methylene chloride with hydrogen fluoride in gas phase at 280 to 340° C. in the presence of a fluorination catalyst to produce chlorofluoro methane, and secondly reacting the chlorofluoro methane with hydrogen fluoride in liquid phase at 60 to 80° C. in the presence of an antimony chloride catalyst. The method is advantageous in that HFC-32 is produced in high yield under mild reaction conditions using a relatively small amount of energy.

REFERENCES:
patent: 5495057 (1996-02-01), Nam et al.
patent: 5763708 (1998-06-01), Clemmer et al.
patent: 6365580 (2002-04-01), Clemmer et al.

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