| 摘要 |
The continuous process for the preparation of difluoromethane (F32) from methylene chloride (F30) and hydrogen fluoride (HF) in the gaseous phase and in the presence of a fluorination catalyst is claimed. The reaction is effected in the presence of chlorine (Cl2), and the gaseous effluent from the reactor is distilled to separate (at the head) a flow comprising hydrogen chloride (HCl) and at least 90% of the F32, and from the base, a flow containing at least 90% of non-converted (F30, F31, and HF) reactants. F31 is chlorofluoromethane. The flow from the base is re-cycled to the reactor. |
