Synthesis of difluoromethane

Details Synthesis of difluoromethane Synthesis of difluoromethane

1996-06-14

1999-05-04

Geist, Gary

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

Organic compounds

Halogen containing

570169, 570168, C07C 1908

Patent

active

059005149

ABSTRACT:
The invention relates to the manufacture of difluoromethane by catalytic gas-phase fluorination of methylene chloride.
The operation is carried out in the presence of oxygen at a temperature of between 330 and 450.degree. C. and with a bulk or supported chromium catalyst.

REFERENCES:
patent: 2745886 (1956-05-01), Ruh
patent: 3644545 (1972-02-01), Buckman
patent: 5051537 (1991-09-01), Manzer
patent: 5494876 (1996-02-01), Tsjui
patent: 5523500 (1996-06-01), Cheminal
French Search Report dated Feb. 21, 1996.

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