| 摘要 |
PROCESS FOR THE SEPARATION OF HYDROGEN FLUORIDE, 1,1-DICHLORO-1- FLUOROETHANE AND 1-CHLORO-1,1-DIFLUOROETHANE FROM LIQUID MIXTURES THEREOF 1,1-Dichloro-1-fluoroethane, 1-chloro-1,1-difluoro-ethane and hydrogen fluoride are separated from their liquid mixtures, such as liquid mixtures resulting from the hydrofluorination of 1,1,1-trichloroethane or vinylidene chloride. 1,1-Dichloro-1-fluoroethane and 1-chloro-1,1-difluoroethane are first separated by distillation into their respective mixtures with hydrogen fluoride, which are thereafter subjected to parallel phase separations resulting in two hydrogen fluoride-enriched liquid phases, a 1chloro-1,1-difluoroethane-enriched liquid phase and a 1,1dichloro-1-fluoroethane-enriched liquid phase. 1-Chloro-1,1-difluoroethane and 1,1-dichloro-1-fluoroethane are purified from the respective halohydrocarbon-enriched liquid phases by distillation. The hydrogen fluorideenriched stream generated from the phase separation of the hydrogen fluoride/1,1-dichloro-1-fluoroethane mixture is recycled to the hydrofluorination reaction mixture.
|
