PRODUCTION OF DIFLUOROMETHANE

摘要

PURPOSE:To provide a production method of HFC-32 capable of reducing the corrosion caused by catalyst and alleviating reactional conditions such as reactional temperature and having advantages in the cost and yield. CONSTITUTION:This production method of difluoromethane (HFC-32) comprises the first process that dichloromethane (HCC-30) is made to react with hydrofluoric acid in a liquid phase in the presence of antimony catalyst expressed by the formula SbClxFy(x+y=5, 1<=y<=3) and the second process consisting of either a process that chlorofluoromethane (HCFC-31) existing in the reactional product is made to react with itself in the presence of a catalyst in a liquid phase or a gas phase or a process that the chlorofluoromethane is made to react with hydrofluoric acid in the presence of a catalyst in a gas phase.