초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] A composition consisting essentially of hydrogen fluoride in combination with an effective amount of CH.sub.2 ClF to form an azeotrope or azeotrope-like composition with hydrogen fluoride, said composition containing from about 58 to 65 mole percent CH.sub.2 ClF and boili

[ What is claimed is:] [1.] A composition consisting essentially of hydrogen fluoride in combination with an effective amount of CH.sub.2 ClF to form an azeotrope or azeotrope-like composition with hydrogen fluoride, said composition containing from about 58 to 65 mole percent CH.sub.2 ClF and boiling at a temperature from about -25.degree. C. to about 75.degree. C.