Process for the epoxidation of olefins in the presence of...

C - Chemistry – Metallurgy – 07 – D

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C07D 301/12 (2006.01)

Patent

CA 2507068

The present invention refers to a process for the catalytic epoxidation of olefins in the presence of a titanium containing zeolite catalyst and a polar solvent whereby the deactivation of the catalyst upon recycling of the solvent has been considerably reduced. In the process one or more nitrogen containing compounds are introduced at some stage, a solvent stream is recovered, treated to contain less than 50 wppm nitrogen in the form of organic nitrogen compounds and at least a part of it is recycled to the epoxidation step. The invention is also directed towards a process for the catalytic epoxidation of propene which integrates the inventive treatment and recycle of the solvent into the workup of the reaction mixture.

La présente invention concerne un procédé d'époxydation catalytique d'oléfines en présence d'un catalyseur zéolithique contenant du titane et d'un solvant polaire, permettant de réduire considérablement la désactivation du catalyseur après recyclage du solvant. Dans le procédé décrit dans cette invention, un ou plusieurs composés contenant de l'azote sont introduits à certaines étapes; un flux de solvant est récupéré puis traité de manière à contenir moins de 50 ppm en poids d'azote sous la forme de composés d'azote organique dont une partie au moins est recyclée vers l'étape d'époxydation. La présente invention concerne également un procédé d'époxydation catalytique du solvant dans le traitement final du mélange de réaction.

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