| 摘要 |
<p>A process for producing difluoromethane and 1,1,1,2-tetrafluoroethane comprising the steps of: (1) reacting methylene chloride and 1,1,2-trichloroethylene with hydrogen fluoride in a first reactor in a gas phase in the presence of a fluorination catalyst and 1,1,1,2-tetrafluoroethane, and (2) reacting 1,1,1-trifluorochloroethane with hydrogen fluoride in a second reactor in a gas phase in the presence of a fluorination catalyst, and supplying a reaction mixture formed in the second reactor to the first reactor. This process makes it possible to obtain HFC-32 at a high conversion and a high selectivity by fluorinating HCC-30 by using, in common, a large amount (excess) of hydrogen fluoride necessary for producing HFC-134a.</p> |
