Production of dihalomethanes containing fluorine and azeotropes

Details Production of dihalomethanes containing fluorine and azeotropes Production of dihalomethanes containing fluorine and azeotropes

1995-06-02

1999-09-21

Siegel, Alan

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

Organic compounds

Halogen containing

570181, C07C 1908, C07C 2100

Patent

active

059556374

ABSTRACT:
A process for producing difluoromethane is disclosed which includes the step of contacting a gaseous mixture containing CH.sub.2 Cl.sub.2 and hydrogen fluoride with a catalyst containing a catalytically effective amount of trivalent chromium supported on a carbon having an ash content of less than 0.5 percent by weight, at a temperature of from about 180.degree. C. to about 375.degree. C. The catalyst and temperature conditions of this process allow the concurrent reaction CCl.sub.3 CF.sub.3 with HF to form CCl.sub.2 FCF.sub.3. CH.sub.2 ClF and unreacted CH.sub.2 Cl.sub.2, each of which may be recovered as an azeotrope with HF, may be recycled.

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