Preparation of 1,1,1-trifluoro-2,2-dichloroethane
AssigneeAllied Chemical Corporation
InventorsRichard F. Sweeney, James O. Peterson
Life of this patent
Estimating the term…
Abstract
1,1,1-trifluoro-2,2-dichloroethane [CF.sub.3 CHCl.sub.2 ] is prepared by contacting 1,1,1-trifluoro-2-chloroethane [CF.sub.3 CH.sub.2 Cl] with a less than molar equivalent of chlorine under conditions of photochemical chlorination. The CF.sub.3 CHCl.sub.2 is recovered substantially devoid of contaminating 1,1,1-trifluoro-2,2,2-trichloroethane [CF.sub.3 CCl.sub.3 ] by-product.
Claims14
A process for the preparation of 1,1,1-trifluoro-2,2-dichloroethane, comprising photochlorinating 1,1,1-trifluoro-2-chloroethane in a reaction zone with a less than molar equivalent of chlorine in the presence of actinic radiation, and with a residence time in the chlorine/1,1,1-trifluoro-2-chloroethane reaction zone of such duration that essentially no unreacted chlorine is entrained in the reaction effluent, but of insufficient duration as to effect other than minimal by-production of perhalogenated contaminant.
Dependencies are inferred from the claim text.