Process for the separation of hydrogen fluoride from its mixture

Details Process for the separation of hydrogen fluoride from its mixture Process for the separation of hydrogen fluoride from its mixture

1979-01-10

1980-06-24

Davis, C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260653, 423240, C07C 702

Patent

active

042094704

ABSTRACT:
Process for the separation of hydrogen fluoride from its mixtures with 1-chloro-1,1-difluoroethane, such as those obtained in the manufacture of the latter. An auxiliary solvent, chosen from among 1,1-dichloro-1-fluoroethane, vinylidene chloride, 1,1,1-trichloroethane and mixtures thereof, is added to the mixture so as to obtain two separate liquid phases, one of which contains the hydrogen fluoride and the other of which contains the 1-chloro-1,1-difluoroethane. Virtually all the hydrogen fluoride is recovered in the anhydrous form in the manufacture of monomers such as vinylidene fluoride, from chlorohydrocarbons such as vinylidene chloride and 1,1,1-trichloroethane.

REFERENCES:
patent: 2894044 (1959-07-01), Prill
patent: 3442961 (1969-05-01), Hutton
patent: 3696156 (1972-10-01), Weaks
patent: 3873629 (1975-03-01), Jones
patent: 4102981 (1978-07-01), Woychesin et al.
patent: 4157380 (1979-06-01), Prahl

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