Catalytic cracking device and method

By optimizing the gas-solid fluidization state and catalyst reuse in the multi-stage reaction unit and cracking reaction unit of the catalytic cracking device, the problems of low gas-solid mixing and contact efficiency and insufficient proportion of light hydrocarbon refining in the existing devices are solved, and efficient catalytic cracking and flexible product regulation are achieved.

WO2025060210A1 Publication Date: 2025-03-27PETROCHINA CO LTD
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Patent Information

Application Number
PCT/CN2023/130672
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-20
Filing Date
2023-11-09
Publication Date
2025-03-27

AI Technical Summary

Technical Problem

During the cracking process of heavy oil and light hydrocarbons, the gas-solid mixing and contact efficiency of existing catalytic cracking devices is low, resulting in difficult to flexibly regulate the product properties and distribution, and the proportion of light hydrocarbon refining is insufficient.

Method used

The multi-stage reaction unit and the cracking reaction unit are arranged in parallel. By setting an internal conveying pipe in the multi-variable diameter lifting pipe of the multi-stage reaction unit, the gas-solid fluidization state is optimized; a turbulent reaction section is set in the cracking settler of the cracking reaction unit to achieve efficient contact reaction between the light hydrocarbons and the catalyst, and the catalyst after cracking the light hydrocarbons is reused to the heavy oil reactor.

Benefits of technology

The gas-solid mixing and contact efficiency during the cracking of heavy oil and light hydrocarbons is improved, the catalytic reaction efficiency is enhanced, the tight coupling between heavy oil and light hydrocarbon reactor is achieved, the flexibility of regulating product properties and distribution is improved, and the refining ratio of light hydrocarbons is improved.

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Abstract

The present invention relates to the field of catalysis. Provided are a catalytic cracking device and method. The device comprises a multi-stage reaction unit (1) and a cracking reaction unit (2), wherein the multi-stage reaction unit comprises a variable-diameter riser pipe (11) and a multi-stage reaction settler (12), and the cracking reaction unit (2) comprises a cracking riser pipe (21) and a cracking settler (23); the variable-diameter riser pipe (11) comprises a first reaction zone (11a), a second reaction zone (11b) and a third reaction zone (11c); the inner diameter of the second reaction zone (11b) is larger than the inner diameter of the first reaction zone (11a) and the inner diameter of the third reaction zone (11c), and an inner conveying pipe (13) extending into the second reaction zone (11b) is provided at the connection between the third reaction zone (11c) and the second reaction zone (11b); and a cracking catalyst outlet (25) in communication with the second reaction zone (11b) is provided in a cracking stripping section (23a) of the cracking settler (23). The device can improve the reaction efficiency of catalytic cracking of heavy oil and light hydrocarbons, and achieve a tight coupling between the heavy oil and the light hydrocarbons.
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