Dehydrofluorination and dehydrogenation of fluorinated alkanes

Details Dehydrofluorination and dehydrogenation of fluorinated alkanes Dehydrofluorination and dehydrogenation of fluorinated alkanes

C - Chemistry, Metallurgy

07

C

260/705, 260/657

C07C 1/30 (2006.01) B01J 37/26 (2006.01) C07C 11/02 (2006.01) C07C 17/00 (2006.01) C07C 17/25 (2006.01) C07C 21/18 (2006.01) C07C 22/08 (2006.01)

Patent

CA 2019914

Fluorinated alkanes are converted into corresponding unsaturated dehydrofluorination products by contact with a catalyst bed containing .gamma.-fluorided alumina in the presence of a co-reactant gas at a reaction temperature of from about 200°C to about 700°C, the catalyst bed having been prepared by the steps of (a) flowing air over a catalyst bed containing .gamma.-alumina for a contact time of from about 5 seconds to about 150 seconds, at a temperature of from about 600°C to about 750°C, and (b) thereafter flowing hydrogen fluoride over the air-treated catalyst bed at elevated temperature to convert the .gamma.-alumina to .gamma.-fluorided alumina. The co-reactant gas contains oxygen, carbon dioxide or mixtures thereof. The .gamma.-fluorided alumina-containing catalyst may also be utilized to convert 1,1-difluoroethane to its dehydrogenation product, vinylidene fluoride at a reaction temperature of from about 300°C to about 700°C.

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