METHOD FOR THE PURIFICATION OF PHARMACEUTICAL GRADE HFC-134A AND POLYMER GRADE HCFC-22

摘要

A method for the purification of pharmaceutical grade 1, 1, 1,2-tetrafluoroethane (HFC-134a) and polymer grade chlorodifluoromethane (HCFC-22) by contacting a mixture comprising 1, 1, 1,2-tetrafluoroethane or chlorodifluoromethane and methyl chloride with a zeolite such as a molecular sieve, and recovering from said contacted mixture substantially purified 1, 1, 1,2-tetrafluoroethane or chlorodifluoromethane.