Process for producing difluoromethane and difluorochloromethane

摘要

The present invention relates to a process for producing difluoromethane or difluorochloromethane, which comprises reacting dichloromethane or trichloromethane with hydrogen fluoride in a liquid phase in the presence of a fluorinating catalyst in a reaction apparatus, wherein the reaction pressure is from 0.1 to 2 MPa, the reaction temperature is within the range of from 50 to 150 DEG C and is a temperature at which hydrogen fluoride is not liquefied under such reaction pressure, and difluoromethane and difluorochloromethane are produced alternatively in one reaction apparatus which can simultaneously produce difluoromethane and difluorochloromethane.