| 摘要 |
PCT No. PCT/GB94/00497 Sec. 371 Date Sep. 6, 1995 Sec. 102(e) Date Sep. 6, 1995 PCT Filed Mar. 14, 1994 PCT Pub. No. WO94/21579 PCT Pub. Date Sep. 29, 1994A process for the production of difluoromethane comprising (a) contacting dichloromethane with hydrogen fluoride in the presence of a fluorination catalyst to produce a product stream comprising difluoromethane, monochloromonofluoromethane and unreacted starting materials and (b) separating difluoromethane from the product stream from step (a), wherein sufficient hydrogen fluoride is employed in the process such that during step (b) the molar ratio of hydrogen fluoride to monochloromonofluoromethane is at least about 100:1. |
