| 摘要 |
PURPOSE:To inexpensively obtain the title high-purity compound without preparing by-products, by using readily obtainable 1,1,2-trichloro-1,2,2-trifluoroethane as a starting raw material, carrying out isomerization reaction and fluorinating the resultant compound with hydrofluoric acid. CONSTITUTION:1,1,2-Trichloro-1,2,2-trifluoroethane is used as a starting raw material and isomerized preferably in the presence of an isomerizing catalyst in a gas phase under normal pressure or under pressure or in a liquid phase under pressure at 50 deg.C-550 deg.C, especially 100 deg.C-400 deg.C to give 1,1,1-trichloro-2,2,2- trifluoroethane. Then the reaction product is fluorinated with hydrofluoric acid preferably in the presence of a fluorinating agent in a gas phase under normal pressure or in a liquid phase under pressure at 50-550 deg.C, especially 50 deg.C-450 deg.C to give the aimed compound. Preferably 0 or Cl is present to maintain catalytic activity. |
