Process for continuous liquid phase reaction of hydrogen fluoride and 1,1,1,-trichloroethane to provide 1,1-dichloro-1-fluoroethane and 1-chloro-1,1-difluoroethane mixtures

摘要

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 Vapor phase reaction product is continuously withdrawn from the reaction zone, and hydrogen fluoride is continuously selectively refluxed back to the reaction mixture. 1,1,1-Trichloroethane utilization approaches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.