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Catalytic cracking method and system

A catalytic cracking and lean gas technology, applied in the field of catalytic cracking methods and catalytic cracking systems, can solve the problems of increased gas phase load, high propylene content, and low absorption efficiency of the reabsorption tower

Active Publication Date: 2021-06-08
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a catalytic cracking method and system in order to overcome the problems existing in the prior art when dry gas is used as the pre-lifting medium, the gas phase load of the reabsorption tower is increased, the absorption efficiency is low, and the content of propylene in the dry gas is high.

Method used

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  • Catalytic cracking method and system
  • Catalytic cracking method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Feed catalytic cracking raw materials into a riser reactor of equal diameter, react under the conditions of temperature 502°C and pressure 0.2MPa, separate the gas phase product from the reaction product, and lead the gas phase product to the spray absorption tower through pipeline 10 Treatment, the absorbent used is stabilized gasoline. The resulting lean gas composition after absorbent treatment is 96% by volume C 1 、C 2 , about 3.9 vol% C 3 、C 4 and about 0.1% by volume of C 5 the above components. 30% by volume of the lean gas is injected into the riser reactor through the pre-lift medium inlet 12 at the bottom of the riser reactor, and the rest of the lean gas is injected into the reabsorption tower for further processing, wherein the pressure of the lean gas is 1.25 MPa. The obtained product distribution list is shown in Table 2.

Embodiment 2

[0060] Feed catalytic cracking raw materials into a riser reactor of equal diameter, react under the conditions of temperature 430°C and pressure 0.15MPa, separate the gas phase product from the reaction product, and lead the gas phase product to the spray absorption tower through pipeline 10 Treatment, the absorbent used is stabilized gasoline. The resulting lean gas composition after absorbent treatment is 90% by volume C 1 、C 2 , about 9.5 vol% C 3 、C 4 and about 0.5% by volume of C 5 the above components. 50% by volume of the lean gas is injected into the riser reactor through the pre-lift medium inlet 12 at the bottom of the riser reactor, and the rest of the lean gas is injected into the reabsorption tower for further processing, wherein the lean gas pressure is 0.8 MPa. The obtained product distribution list is shown in Table 2.

Embodiment 3

[0062] Feed catalytic cracking raw materials into a riser reactor of equal diameter, react under the conditions of temperature 600°C and pressure 0.3 MPa, separate gas phase products from reaction products, and lead gas phase products to spray absorption tower through pipeline 10 Treatment, the absorbent used is stabilized gasoline. The resulting lean gas composition after absorbent treatment is 99% by volume C 1 、C 2 , about 0.9 vol% C 3 、C 4 and about 0.1% by volume of C 5 the above components. 21% by volume of the lean gas is injected into the riser reactor through the pre-lift medium inlet 12 at the bottom of the riser reactor, and the rest of the lean gas is injected into the reabsorption tower for further processing, wherein the pressure of the lean gas is 1.5 MPa. The obtained product distribution list is shown in Table 2.

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Abstract

The invention relates to the field of catalytic cracking reactions, and discloses a catalytic cracking method and a catalytic cracking system. The method comprises: under the action of a pre-lifting medium, the catalytic cracking raw material is subjected to a catalytic cracking reaction in a riser reactor, the gas phase is separated from the reaction product, and the gas phase is injected into an absorption tower for treatment, and the gas phase is injected from the top of the absorption tower Lean gas is collected and at least a portion of said lean gas is recycled as a pre-lift medium. The catalytic cracking system includes a reaction device equipped with a riser reactor and an absorption tower, the gas phase outlet at the top of the reaction device communicates with the gas phase inlet of the absorption tower, and the lean gas outlet at the top of the absorption tower communicates with the lift The pre-lift medium inlet at the bottom of the tube reactor communicates. By adopting the catalytic cracking method and the catalytic cracking system of the present invention, the gas phase load of the reabsorption tower can be reduced, the absorption effect can be effectively improved, and the propylene component carried in the dry gas can be reduced.

Description

technical field [0001] The invention relates to the field of catalytic cracking reactions, in particular to a catalytic cracking method and a catalytic cracking system. Background technique [0002] The pre-lifting technology at the bottom of the catalytic cracking riser is a process technology commonly used in various catalytic cracking units at present. By setting a pre-lifting section at the bottom of the riser, this technology can prevent the catalyst from back-mixing and depositing at the bottom of the riser and promote the catalyst to flow in the feed nozzle. Uniform distribution and good oil contact. The pre-lift medium currently used is generally steam and dry gas. When steam is used as a lifting medium, it will cause the thermal collapse of the catalyst, generate fine powder, and increase the consumption of the catalyst. The latent heat of vaporization of water is large, and the increase in the amount of water vapor will increase the cooling load of the top cooler...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G55/06
CPCC10G55/06
Inventor 黄晓明王强徐成裕鹿志勇孙士勇
Owner CHINA PETROLEUM & CHEM CORP
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