| 摘要 |
<p>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. 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.</p> |
