C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 19/08 (2006.01) B01J 23/86 (2006.01) B01J 27/125 (2006.01) B01J 27/128 (2006.01) B01J 27/132 (2006.01) C07C 17/20 (2006.01) C07C 19/12 (2006.01)
Patent
CA 2113511
The invention relates to a process for producing 1,1,1,2-tetrafluoro-2-chloroethane and pentafluoroethane. The process, which consists in the gas phase catalytic fluorination of at least one pentahaloethane of the formula C2HX2-n F3+n wherein X represents a chlorine or bromium atom and n is the number 0 or 1, using hydrofluoric acid, is characterized in that a mixed catalyst comprising nickel and chromium oxides, halides and/or oxyhalides deposited on a support comprised of aluminium fluoride or a mixture of aluminium fluoride and alumina. The catalyst is previously activated by drying and by fluorination using hydrofluoric acid.
L'invention concerne un procédé de fabrication du 1,1,1,2-tétrafluoro-2-chloroéthane et du pentafluoroéthane. Le procédé qui consiste en la fluoration catalytique en phase gazeuse d'au moins un pentahalogénoéthane de formule C2HX2-n F3+n dans laquelle X désigne un atome de chlore ou de brome et n le nombre 0 ou 1, au moyen d'acide fluorhydrique, est caractérisé en ce que l'on utilise un catalyseur mixte composé d'oxydes, halogénures et/ou oxyhalogénures de nickel et de chrome déposés sur un support constitué de fluorure d'aluminium ou d'un mélange de fluorure d'aluminium et d'alumine. Le catalyseur est préalablement activé par séchage et par fluoration au moyen d'acide fluorhydrique.
Cheminal Bernard
Lacroix Eric
Lantz Andre
Elf Atochem S.a.
Robic
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