Method for preparing low-carbon olefin from middle distillate

CN119529895AActive Publication Date: 2025-02-28CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202311119024.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-08-31
Publication Date
2025-02-28
Estimated Expiration
2043-08-31

AI Technical Summary

Technical Problem

The prior art is difficult to effectively reduce dry gas yield and improve the yield of low-carbon olefins during catalytic cracking. Especially when the demand for middle distillate oil is slowing down, how to maximize the production of low-carbon olefins and reduce excess middle distillate oil.

Method used

By coupling the intermediate distillate oil with hydrorefining, hydrocracking, alkane dehydrogenation, alkene separation and olefin cracking, saturated chain alkanes are highly selectively converted into olefins, and then converted into low-carbon olefins with olefins as raw materials, selective fracture of the C-C bond is achieved.

Benefits of technology

It has achieved increasing the production of low-carbon olefins while increasing the utilization rate of carbon atoms, significantly reducing the dry gas yield, maximizing the utilization of middle distillate oil resources, and improving the economic benefits of the refinery.

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Abstract

The invention relates to a method for preparing low-carbon olefin from middle distillate oil, which comprises the following steps: converting the middle distillate oil into naphtha fraction rich in alkane through hydrofining and hydrocracking, and then converting the naphtha fraction rich in alkane into fraction rich in olefin by using an alkane dehydrogenation process, and carrying out alkane-olefin separation on the product of the alkane dehydrogenation reaction, and introducing the olefin-rich fraction obtained by separation into an olefin cracking reactor to react with a cracking catalyst, so that the olefin is converted into ethylene, propylene and other low-carbon olefins. By coupling processes such as middle distillate hydrofining, hydrocracking, alkane dehydrogenation, alkane-olefin separation and olefin cracking, saturated chain alkane is converted into olefin with high selectivity, and then olefin is converted into low-carbon olefin by taking olefin as a raw material, so that selective fracture of C-C bonds is realized; and the purpose of increasing the yield of low-carbon olefins is achieved while the utilization rate of carbon atoms is increased.
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Citation Information

Patent Citations

  • Catalytic conversion method for preparing ethylene, propylene and butylene

    CN114763495A

  • Catalytic conversion method for maximum production of ethylene and propylene

    CN115028507A