Process for continuous liquid phase reaction of hydrogen fluorid

Details Process for continuous liquid phase reaction of hydrogen fluorid Process for continuous liquid phase reaction of hydrogen fluorid

1992-05-01

1997-03-04

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

C07C 1720

Patent

active

056081243

ABSTRACT:
A continuous non-catalytic process for the manufacture of 1,1-dichloro-1-fluoroethane/1-chloro-1,1-difluoroethane mixtures from 1,1-dichloro-1-fluoroethane is provided. Hydrogen fluoride and 1,1,1-trichloroethane are continuously feed a molar ratio of from about 3.0 to about 5.2 to form a liquid phase hydrofluorination reaction mixture. Vapor phase reaction product is continuously withdrawn from the reaction zone, and hydrogen fluoride is continuously selectively refluxed back to the reaction mixture. 1,1,1-Trichloroethane utilization approaches 100% , with selectivity for 1,1-dichloro-1-fluoroethane between 15% and 85%, based upon the amount of 1,1-dichloro-1-fluoroethane and 1-chloro-1,1-difluoroethane contained in the gaseous reaction product.

REFERENCES:
patent: 2058453 (1936-10-01), Holt et al.
patent: 2450414 (1948-10-01), Benning
patent: 3833676 (1974-09-01), Ukaji et al.
Chem. Abstracts 85:123323v (1976).

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