C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
23/180, 202/65,
C07C 17/38 (2006.01) B01D 3/36 (2006.01) C01B 7/19 (2006.01) C07C 19/08 (2006.01)
Patent
CA 2013822
PROCESS FOR THE SEPARATION OF HYDROGEN FLUORIDE, 1,1-DICHLORO-1- FLUOROETHANE AND 1-CHLORO-1,1- DIFLUOROETHANE FROM LIQUID MIXTURES THEREOF Abstract of the Disclosure 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 result- ing in two hydrogen fluoride-enriched liquid phases, a 1- chloro-1,1-difluoroethane-enriched liquid phase and a 1,1- dichloro-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 fluoride- enriched stream generated from the phase separation of the hydrogen fluoride/1,1-dichloro-1-fluoroethane mixture is recycled to the hydrofluorination reaction mixture.
Atochem North America Inc.
Borden Ladner Gervais Llp
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