| 摘要 |
#CMT# #/CMT# Preparation of pentafluoroethane from perchloroethylene (PER) and hydrogen fluoride (HF) in gas phase in the presence of a catalyst, comprises reacting the PER with HF at pressure of greater than 5 bar absolute, where the HF/PER molar ratio is >= 20; separating the obtained outflow to give a light product fraction comprising hydrochloric acid and pentafluoroethane and a heavy product fraction comprising non reacted hydrochloric acid and optionally non reacted perchloroethylene; and recycling the heavy product fraction directly in reacting step without any purification operation. #CMT# : #/CMT# Preparation of pentafluoroethane from perchloroethylene and hydrogen fluoride in gas phase in the presence of a catalyst, comprises reacting the PER with HF, where the reacting step is carried out with a HF/PER molar ratio of >= 20 and a pressure of greater than 5 bar absolute; separating the outflow of the reacting step to give a light product fraction comprising hydrochloric acid and pentafluoroethane and a heavy product fraction comprising non reacted hydrochloric acid and optionally non reacted perchloroethylene; and recycling the heavy product fraction directly in reacting step without any purification operation. #CMT#USE : #/CMT# The process is useful for preparation of the pentafluoroethane (claimed). #CMT#ADVANTAGE : #/CMT# The process is a continuous process to prepare pentafluoroethane. The process maintains the stability of the catalyst even in high temperature. The process does not depend on any conditions of separation and purification products. #CMT#INORGANIC CHEMISTRY : #/CMT# Preferred Components: The catalyst is a mixed catalyst comprising oxides, halides and/or oxyhalides of nickel and chromium deposited on a support containing aluminum fluoride or its mixture and alumina fluoride. #CMT#ORGANIC CHEMISTRY : #/CMT# Preferred Process: The reaction step is carried out: at a pressure of 6-15 bar absolute, preferably 6-12 bar absolute; and in the presence of oxygen. Preferred Composition: The heavy product fraction further comprises dichlorotrifluoroethane and/or chlorotetrafluoroethane formed in reaction step. The temperature of the reaction is 310-400[deg] C, preferably 330-375[deg] C. Preferred Components: The molar ratio of HF/PER in reacting step is 20:60, preferably 25:50. #CMT#EXAMPLE : #/CMT# No suitable example given. |
