1988•OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)Requires access
Displacement of fluorine from dichlorofluoromethane by anhydrous hydrogen chloride
A.N. Golubev, N.S. Vereshchagina
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Abstract
In the manufacture of difluorodichloromethane and difluorochloromethane by liquid-phase hydrofluorination of carbon tetrachloride and chloroform in the presence of antimony pentachloride, some of the hydrogen fluoride (5-10%) does not enter into reaction and is carried over by the synthesis gases. The authors sought determine whether hydrogen chloride is inert with respect to fluorochlorocarbons in the presence of antimony pentachloride. They found that anhydrous hydrogen chloride displaces fluorine from dichlorofluoromethane during contact of the gaseous mixture with antimony pentachloride. It is quite probable that this reaction is responsible for the incomplete conversion of hydrogen fluoride in the manufacture of difluorochloromethane by liquid-phase hydrofluorination of chloroform.