Process for epoxidation of propylene

C - Chemistry – Metallurgy – 07 – D

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C07D 301/12 (2006.01) B01J 29/89 (2006.01) B01J 29/90 (2006.01)

Patent

CA 2293637

Propylene is converted to propylene oxide in a highly efficient liquid phase process wherein temperature and pressure are both increased over the course of the epoxidation, which is preferably conducted in a continuous mode of operation. The catalyst used is a heterogeneous catalyst such as titanium silicalite or titania-on-silica. The oxidizing agent is an active oxygen species such as hydrogen peroxide or an organic hydroperoxide. When the desired yield of propylene oxide can no longer be maintained, the catalyst is replaced or regenerated. Regeneration by washing the catalyst with a hot solvent containing a source of ammonium or alkali metal cations is highly effective, especially where the catalyst is a titanium-containing zeolite.

Selon cette invention, le propylène est converti en oxyde de propylène grâce à un processus en phase liquide très efficace caractérisé par l'augmentation à la fois de la température et de la pression au cours de l'époxydation qui, de préférence, se déroule en mode continu. Le catalyseur utilisé est un catalyseur hétérogène tel que la silicalite de titane ou le dioxyde de titane sur silice. L'agent oxydant est une espèce d'oxygène actif telle que le peroxyde d'hydrogène ou un hydroperoxyde organique. Lorsque la quantité d'oxyde de propylène recherchée ne peut plus être maintenue, le catalyseur est remplacé ou régénéré. La régénération par lavage du catalyseur au moyen d'un solvant chaud contenant une source de cations de métal alcalin ou d'ammonium est très efficace, en particulier lorsque le catalyseur est une zéolite renfermant du titane.

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