Manufacture of fluoroethylenes and chlorofluoroethylenes
AssigneeElf Atochem S.A.
InventorsBernard Berthe, Jean-Marie Cognion
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Abstract
The invention relates to hydrogenolysis of a chlorofluoroethane XYClC--CClX'Y' or of a chlorofluoroethylene XClC.dbd.CX'Y (where at least one of the symbols X, X', Y and Y' is a fluorine atom and the others are hydrogen or chlorine atoms) which is performed on a mixed catalyst based on copper or silver and on at least one platinum group metal (Ru, Rh, Pd, Os, Ir, Pt), these metals being deposited on a support. Even at low operating temperatures, excellent degrees of conversion and selectivities for fluoroethylenes and/or chlorofluoroethylenes are obtained.
Claims9
Process for the manufacture of a fluoroethylene and/or a chlorofluorethylene comprising contacting a mixed catalyst consisting essentially of 1 to 20% by weight of copper and 0.1 to 10% by weight of palladium deposited on an activated carbon support with a chlorofluoroethane of ##STR4## in which at least one of the symbols X, X', Y and Y' represents a fluorine atom and the others, which may be identical or different, each represents a hydrogen or chlorine atom, or with a chlorofluoroethylene of formula:
- ##STR5## in which at least one of the symbols X, X' and Y represents a fluorine atom and the others, which may be identical or different, each represents a hydrogen or chlorine atom, at a temperature of about 100.degree. to 401.degree. C. with hydrogen to catalytically hydrogenolize the chlorofluoroethane or chlorofluoroethylene of formula (I) or (II) respectively.
Dependencies are inferred from the claim text.