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Process for the purification of pharmaceutical grade HFC-134a and polymer grade HCFC-22
Process for the purification of pharmaceutical grade HFC-134a and polymer grade HCFC-22
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机译:制药级HFC-134a和聚合物级HCFC-22的纯化方法
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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 containing 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.
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