Preparation of halogen and hydrogen containing alkenes over...

C - Chemistry – Metallurgy – 07 – C

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C07C 17/25 (2006.01) B01J 21/02 (2006.01) B01J 21/04 (2006.01) B01J 32/00 (2006.01) B01J 37/26 (2006.01) C07C 21/18 (2006.01)

Patent

CA 2692520

Halogenated alkenes, especially fluorinated alkenes can be prepared from halogenated and fluorinated alkanes, re-spectively, by dehydrohalogenation or dehydrofluorination in the presence of a high- surface metal fluoride or oxifluoride. Preferably, trifluoroethylene, pentafluoropropene, tetrafluorobutenes or trifluorobutadiene are prepared. Aluminium fluoride is highly suitable. The metal fluoride or oxifluoride can be applied supported on a carrier.

L'invention concerne des alcènes halogénés, en particulier des alcènes fluorés, qui peuvent être préparés à partir d'alcanes halogénés et fluorés, respectivement, par déshydrohalogénation ou par déshydrofluoration en présence d'un fluorure ou d'un oxyfluorure métallique de surface spécifique élevée. De préférence, le trifluoroéthylène, le pentafluoropropène, les tétrafluorobutènes ou le trifluorobutadiène sont préparés. Le fluorure d'aluminium est très approprié. Le fluorure ou l'oxyfluorure métallique peut être appliqué en étant supporté sur un support.

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