Process for the epoxidation of olefins

A technology of epoxidation reaction and olefin, applied in the direction of organic chemistry, etc., can solve the problems that the long-term activity and selectivity data of the catalyst cannot be obtained, and the data has not been reached.
CN1684947AActive Publication Date: 2005-10-19EVONIK OPERATIONS GMBH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
EVONIK OPERATIONS GMBH
Publication Date
2005-10-19

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Abstract

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.
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Description

Technical field

[0001] The present invention relates to an improved method for continuous epoxidation of olefins, which uses a heterogeneous catalyst to promote the epoxidation reaction, thereby greatly reducing the deactivation of the catalyst. Background technique

[0002] It is known from EP-A 100 119 that if titanium-containing zeolite is used as a catalyst, propylene can be converted into propylene oxide by hydrogen peroxide.

[0003] Unreacted hydrogen peroxide cannot be economically recovered from the epoxidation reaction mixture. Moreover, unreacted hydrogen peroxide brings additional workload and expense to the processing of the reaction mixture. Therefore, it is preferable to use excess propylene to epoxidize propylene to achieve high hydrogen peroxide conversion. In order to obtain a high hydrogen peroxide conversion rate, it is advantageous to use a continuous flow reaction system. And for industrial-scale processes, high selectivity to the requir...

Claims

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