| 摘要 |
1. A process for the preparation of 1,1,1,3,3-pentafluoropropane, according to which 1,1,1,3,3-pentachloropropane is reacted with hydrogen fluoride in the presence of a hydrofluorination catalyst. 2. A process according to claim 1, in which the reaction is carried out continuously in a liquid phase with a molar ratio between the catalyst and 1,1,1,3,3-pentachloropropane present in the liquid phase maintained from 0.001 to 1000. 3. A process according to claim 2, in which the molar ratio of the catalyst to 1,1,1,3,3-pentachloropropane is maintained superior to 0.5. 4. A process according to any one of claims 1 to 3, in which the reaction is carried out at a temperature and under a pressure at which 1,1,1,3,3-pentafluoropropane is gaseous and in which 1,1,1,3,3-pentafluoropropane and hydrogen chloride are drawn off in a gaseous phase as they are being formed. 5. A process according to any one of claims 1 to 4, in which the hydrofluorination catalyst is chosen from tin and antimony chlorides, fluorides and chlorofluorides. 6. A process according to any one of claims 1 to 5, in which the catalyst used is antimony pentachloride. 7. A process according to any one of claims 1 to 6, in which from 5 to 100 moles of hydrogen fluoride are used per mole of 1,1,1,3,3-pentachloropropane. 8. A process according to any one of claims 1 to 7, in which the reaction is carried out at a temperature of approximately 50 to 150 degree C and at a pressure of 2 to 40 bar. 9. A process according to any one of claims 1 to 8, in which the 1,1,1,3,3-pentachloropropane used is prepared by reaction between vinyl chloride and tetrachloromethane. 10. A process according to claim 9, wherein the vinyl chloride and the tetrachloromethane are reacted continuously in the presence of a telomerization catalyst chosen from copper compounds. 11. A process according to any one of claims 1 to 9, in which 1,1,1,3,3-pentafluoropropane and hydrogen chloride are drawn off from the reaction medium as they are being formed. |
