| 摘要 |
PROBLEM TO BE SOLVED: To provide a new production method for 1,1,1,2-tetrafluoroethane and/or pentafluoroethane, and the use thereof. SOLUTION: The production method for 1,1,1,2-tetrafluoroethane and/or pentafluoroethane comprises reacting trichloroethylene and/or tetrachloroethylene with hydrogen fluoride and purifying the obtained crude product. In this case, the crude product includes a main product containing the objective compounds, hydrogen fluoride as an azeotropic component with the main product and impurities containing at least unsaturated compounds. As a method for obtaining the high purity objective compounds from the crude product, this invention provides a new purification process comprising a step of bringing a mixture obtained by newly adding hydrogen fluoride to the crude product into contact with a fluorination catalyst in a vapor phase to reduce the content of unsaturated compounds contained in the crude product, and a step of distillation. COPYRIGHT: (C)2006,JPO&NCIPI
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