Heterogeneous epoxidation catalyst

C - Chemistry – Metallurgy – 07 – D

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C07D 301/19 (2006.01)

Patent

CA 2379567

Highly active and selective epoxidation catalysts are prepared by combining high surface area silica support or the like, having surface area greater than 1100 m2/g, with a titanium source. The titanium source is a non-oxygenated hydrocarbon solution of a titanium halide or a vapor stream of titanium tetrachloride. The impregnated support is then calcined at an elevated temperature (preferably, in a substantially oxygen-free atmosphere), and, optionally, reacted with water and/or silylated. The resulting materials are highly active heterogeneous epoxidation catalysts for the reaction of olefins with organic hydroperoxides.

L'invention concerne des catalyseurs d'époxydation particulièrement actifs et sélectifs, préparés par combinaison d'un support de silice à surface étendue, dont la zone de surface est supérieure à 1100 m<2>/g, avec une source de titane. La source de titane est une solution à hydrocarbure non oxygéné d'un halogénure de titane ou un courant de vapeur de tétrachlorure de titane. Le support imprégné est alors calciné à une température élevée (de préférence dans une atmosphère sensiblement sans oxygène) et, éventuellement, mis en réaction avec de l'eau et/ou silylé. Les matières obtenues constituent des catalyseurs d'époxydation hétérogènes et particulièrement actifs destinés à faire réagir des oléfines avec des hydroperoxydes organiques.

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