| 摘要 |
PURPOSE:To purify 1,1,1,2-tetrafluoroethane in high purity and good yield by reacting fluoroalkenes contained in the tetrafluoroethane with hydrogen fluoride in the presence of a fluorinated catalyst in vapor phase and then separating and removing the resultant product by distillation. CONSTITUTION:Fluoroalkenes contained in 1,1,1,2-tetrafluoroethane are reacted with hydrogen fluoride in a vapor phase using a fluorine catalyst using alumina, aluminum fluoride or active carbon as a support and containing at least one kind of element selected from a group of Zn, Co and Cr (CF3CH2F is not reacted with hydrogen fluoride) and then the reaction product is separated and removed by distillation. Thereby high-purity CF3CH2F containing no fluoroalkenes is purified in good yield. According to the above-mentioned method, fluoroalkenes which were extremely difficult to separate can efficiently be removed. |
