Process for the separation of hydrogen fluoride, 1,1-dichloro-1-

Details Process for the separation of hydrogen fluoride, 1,1-dichloro-1- Process for the separation of hydrogen fluoride, 1,1-dichloro-1-

1989-05-04

1990-12-04

Bascomb, Wilbur

Distillation: processes, separatory

With disparate physical separation

203 50, 203 67, 203 74, 203 81, 203 98, 203DIG25, 423483, 423488, 570164, 570178, B01D 300, C07C 1738

Patent

active

049751565

ABSTRACT:
1,1-Dichloro-1-fluoroethane, 1-chloro-1,1-difluoroethane 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 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.

REFERENCES:
patent: 2478362 (1949-08-01), Benning
patent: 2549609 (1951-04-01), Johnson
patent: 3833676 (1974-09-01), Ukaji et al.
patent: 4199409 (1980-04-01), Skraba
patent: 4209470 (1980-06-01), Lorquet

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