Methods of selective hydrogenation of C4 after evaporation of residual C4 or ether

By using a catalyst supported on a carrier to carry Pd and basic compounds in the mouth of C4 or alcohol, the problems of low butadiene conversion and poor catalyst stability in the selective hydrogenation of butadiene in C4 were solved. This method achieves a highly efficient conversion of butadiene to 1-butene, reduces the formation of focal spots, improves the butene yield of the product, and at the same time inhibits the stability of the catalyst and prolongs the reaction time.

CN117960170BActive Publication Date: 2025-12-02CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202211309742.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-25
Publication Date
2025-12-02
Estimated Expiration
2042-10-25

AI Technical Summary

Technical Problem

Existing C4 selective hydrogenation technology suffers from problems such as low butadiene conversion, severe isomerization and over-hydrogenation reactions, and poor catalyst stability, making it difficult to efficiently prepare 1-butene.

Method used

A catalyst with Pd and basic compounds supported on a support is used, and the molar ratio of Pd to basic compounds is controlled at 1:0.5-80. The basic compounds include those containing alkali metals, alkaline earth metals and nitrogen elements, and are used for the selective hydrogenation reaction of residual C4 or C4 after etherification.

Benefits of technology

This method achieves high butadiene conversion, reduces focus formation, improves the 1-butene yield of the product, while inhibiting the application rate of 1-butene in the catalyst and the stability of the catalyst, extending the reaction time, and reducing investment costs.

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Abstract

This invention relates to the field of hydrogenation technology and discloses a method for selective hydrogenation of raffinate C4 or post-etherified C4. The raffinate C4 or post-etherified C4 contains butene and butadiene. The method includes: contacting the raffinate C4 or post-etherified C4 with hydrogen gas in the presence of a catalyst to hydrogenate the butadiene in the raffinate C4 or post-etherified C4; wherein the catalyst comprises a support and Pd and a basic compound supported on the support, the molar ratio of Pd to the basic compound being 1:0.5-80, and the basic compound comprising at least one selected from alkali metal-containing basic compounds, alkaline earth metal-containing basic compounds, and nitrogen-containing C0-C30 basic compounds. The method of this invention can maintain high 1-butene selectivity and high 1-butene yield even at high space velocities.
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Citation Information

Patent Citations

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  • 1-butene catalyst prepared through selective hydrogenation of butadiene as well as preparation method and application thereof

    CN108837831A