| 摘要 |
<p>A process for refining difluoromethane by removing hydrogen fluoride which is contained in difluoromethane and has been believed to be difficult to remove, which process comprises distilling a mixture of difluoromethane with hydrogen fluoride and bringing an azeotropic mixture of both compounds as a distillate into contact with sulfuric acid, whereby hydrogen fluoride contained in difluoromethane is absorbed by sulfuric acid.</p> |
