Process for the preparation of tetrafluoro-1,1,1,2-ethane

Details Process for the preparation of tetrafluoro-1,1,1,2-ethane Process for the preparation of tetrafluoro-1,1,1,2-ethane

C - Chemistry, Metallurgy

07

C

C07C 17/20 (2006.01) C07C 19/08 (2006.01)

Patent

CA 2055281

This invention involves the manufacture of 1,1,1,2-tetrafluoroethane by catalytic fluorination of gaseous 1-chloro-2,2,2-trifluoroethane (F-133a). A mixed catalyst composed of oxides, halogenides and/or oxyhalogenides of nickel and chromium deposited on a support of aluminum fluoride or a mixture of aluminum fluoride and alumina. The catalyst is first activated by drying and by fluorination with hydrofluoric acid. This mixed catalyst provides excellent selectivity for F-134a, with enhanced productivity.

L'invention concerne la fabrication du tétrafluoro-1,1,1,2 éthane (134a) par fluoration catalytique du chloro-1-trifluoro-2,2,2-éthane (F133a) en phase gazeuse. 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. Ce catalyseur mixte permet d'obtenir une excellente sélectivité en F134a avec une productivité élevée.

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