Direct epoxidation process using carbonate modifiers

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 301/06 (2006.01) C07D 301/04 (2006.01)

Patent

CA 2465783

The invention is a process for epoxidizing an olefin with hydrogen and oxygen in the presence of a modifier and a catalyst comprising a noble metal and titanium zeolite. The modifier is (a) calcium carbonate in the presence of carbon dioxide or (b) ammonium bicarbonate. The process results in increased catalyst activity, selectivity to epoxide, and increased catalyst life.

L'invention concerne un procédé d'époxydation d'une oléfine avec de l'hydrogène et de l'oxygène, en présence d'un modificateur et d'un catalyseur contenant un métal noble et une zéolite de titane. Le modificateur est (a) un carbonate de calcium en présence de dioxyde de carbone ou (b) un hydrogénocarbonate d'ammonium. Ce procédé se solde par une activité accrue du catalyseur, une sélectivité vis-à-vis de l'époxyde, et une durée de vie plus longue du catalyseur.

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