Process for the epoxidation of olefins with hydrogen...

C - Chemistry – Metallurgy – 07 – D

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C07D 301/12 (2006.01)

Patent

CA 2500402

The present invention refers to a continuos process for the epoxidation of olefins with hydrogen peroxide in presence of a heterogeneous catalyst promoting the epoxidation reaction, whereby the aqueous reaction mixture comprises: i) an olefin;ii) hydrogen peroxide;iii) less than 100 wppm of alkali metals, earth alkali metals, both irrespective whether in ionic, complex or covalently bonded form, bases or cations of bases having a pkB of less than 4.5, or combinations thereof; and iv) at least 100 wppm of bases or cations of bases having a pkB of at least 4.5 or combinations thereof,whereby the wppm are based on the total weight of hydrogen peroxide in the reaction mixture.

L'invention concerne un procédé continu d'époxydation des oléfines avec du peroxyde d'hydrogène en présence d'un catalyseur hétérogène favorisant la réaction d'époxydation. Le mélange de réaction aqueux comprend : i) une oléfine ; ii) du peroxyde d'hydrogène ; iii) moins de 100 ppm en poids de métaux alcalins, de métaux terreux alcalins, tous deux qu'ils soient de forme ionique, complexe ou liée de manière covalente, de bases ou de cations de bases ayant un pk<SB>B</SB> inférieur à 4,5 ou leurs combinaisons ; et iv) au moins 100 ppm en poids de bases ou de cations de bases ayant a pk<SB>B</SB> d'au moins 4,5 ou leurs combinaisons, ppm en poids s'appuyant sur le poids total de peroxyde d'hydrogène dans le mélange de réaction.

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