CATALYTIC CHLOROFLUORINATION PROCESS FOR PRODUCING CHClFCF 3? AND CHF 2?CF 3?.

摘要

A chlorofluorination process is disclosed which employs a catalyst comprising chromium oxide for producing halohydrocarbons of the formula CHXFCF3 (where X is selected from Cl and F). The process is characterized by feeding a combination of components comprising (i) at least one halohydrocarbon starting compound selected from CHCl=CCl2 and CH2ClCF3, (ii) hydrogen fluoride and (iii) chlorine, to a reaction zone; contacting said combination of compounds in said reaction zone with a catalyst comprising chromium oxide at an elevated temperature to produce reaction zone products containing halohydrocarbons of the formula CHXFCF3 together with halohydrocarbon reaction products of the formula CHYClCF3 (wherein Y is selected from Cl and H); and recovering at least a portion of the reaction zone products from the reaction zone including at least one halohydrocarbon of the formula CHXFCF3. Optionally, a portion of the reaction zone products can be recycled to the reaction zone; and the combination of components contacted with the catalyst can optionally further comprise at least one halohydrocarbon recycle compound of said formula CHYClCF3. The process may be controlled to produce halohydrocarbon compounds of the formula CHXFCF 3 in the recovered reaction products as the major component of the halogen-substituted hydrocarbon reaction products in the recovered reaction products.