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AssigneeE. I. Du Pont de Nemours and Company
InventorsPaul S. Furmanek, David A. Glasscock, Michael Keane, Jr., Barry A. Mahler, V. N. Mallikarjuna Rao
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A process for producing difluoromethane is disclosed which includes the step of contacting a gaseous mixture containing CH2Cl2 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 ° C. to about 375° C. The catalyst and temperature conditions of this process allow the concurrent reaction CCl3CF3 with HF to form CCl2FCF3. CH2ClF and unreacted CH2Cl2, each of which may be recovered as an azeotrope with HF, may be recycled.
A process for producing difluoromethane comprising the steps of contacting a gaseous mixture containing CH2Cl2 and HF with a catalyst containing a catalytically effective amount of trivalent chromium supported on a carbon having an ash content less than 0.5 weight percent, at a temperature of from about 180° C. to about 375° C.
A process for producing difluoromethane comprising the steps of:
A process for producing difluoromethane, comprising:
Dependencies are inferred from the claim text.