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Heavy feedstock catalytic cracking process and system

A technology of catalytic cracking and heavy raw materials, applied in catalytic cracking, cracking, petroleum industry, etc., can solve the problem of low propylene yield

Active Publication Date: 2022-01-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw oil first passes through the first hydrotreating unit to obtain the first hydrogenated tail oil; the first hydrogenated tail oil enters the first catalytic cracking unit, and the catalytic active component of the catalytic cracking unit is mainly large-pore zeolite, Obtain naphtha, diesel oil and heavy oil, wherein the heavy oil enters the second hydrotreating unit for hydrogenation to obtain the second hydrogenated tail oil, and the second hydrogenated tail oil enters the second catalytic cracking unit for cracking. The catalyst active component of catalytic cracking unit is mainly mesoporous zeolite, and the propylene yield of this method is low

Method used

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  • Heavy feedstock catalytic cracking process and system
  • Heavy feedstock catalytic cracking process and system
  • Heavy feedstock catalytic cracking process and system

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Effect test

Embodiment 1

[0123] The test was carried out in a medium-sized catalytic cracking unit. The device includes a set of compound reaction system: main downcomer reactor, auxiliary downcomer reactor plus fluidized bed combination reactor, hydrogenation reforming reactor and solvent extraction device, the outlet at the bottom of the main downcomer reactor is connected to bottom of the fluidized bed reactor. The catalyst used is a special catalyst for catalytic cracking. The raw materials shown in Table 1 are cracked. The product obtained from the reaction is separated from the catalyst in the settling section, the product enters the separation device for separation, and the catalyst enters the fluidized bed reactor; Fluidized bed reactor. The catalyst used is a special catalyst for catalytic cracking, which is used for light gasoline rich in olefins from the product separation unit (the distillation range is 32-86 ° C, the olefin content is 53%, and the weight accounts for 16% of heavy raw mat...

Embodiment 2

[0127] With reference to Example 1, the difference is that the mass ratio of light gasoline to heavy raw materials rises from 0.16:1 to 0.17:1, and the weight ratio of hydrogenated diesel oil to heavy raw materials rises to 0.17:1 from 0.12:1 , the mass ratio of hydrogenated modified oil slurry to heavy feedstock increased from 0.035:1 to 0.055:1. Its reaction operating conditions and reaction results are shown in Table 3 and Table 4.

[0128] It can be seen from Table 3 and Table 4 that, compared with the comparative example in which there is no hydrogenation upgrading reactor and solvent extraction device, and a riser reactor is used, the main downcomer reactor is added in Example 1, and the hydrogenation upgrading reaction and the solvent extraction unit, and replaced the riser reactor with an auxiliary downcomer reactor. The decrease in diesel yield indicates that more diesel is converted into light olefins. Diesel quality improved. At the same time, the yield of low-car...

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Abstract

The invention relates to a heavy feedstock catalytic cracking process and a system. The catalytic cracking process comprises the following steps: carrying out catalytic cracking on a heavy raw material in a catalytic cracking reaction system, wherein the catalytic cracking reaction system comprises a main descending tube reactor (2), an auxiliary descending tube reactor (9) and a fluidized bed reactor (3), and material outlets of the main descending tube reactor (2) and the auxiliary descending tube reactor (9) are communicated with the fluidized bed reactor (3). According to the method disclosed by the invention, hydrogenation modification and aromatic hydrocarbon extraction are combined at the same time, so that the heavy oil raw material can be converted into low-carbon olefin rich in propylene and ethylene to the greatest extent, and chemical raw materials such as benzene, methylbenzene and xylene can be co-produced at the same time.

Description

technical field [0001] The invention relates to a process and system for producing light olefins and aromatics by catalytic cracking. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important organic chemical raw materials, and propylene is a synthetic monomer for products such as polypropylene and acrylonitrile. With the rapid growth of demand for derivatives such as polypropylene, the demand for propylene is also increasing year by year. The main methods of producing propylene are steam cracking and catalytic cracking (FCC). Among them, steam cracking uses naphtha and other light oils as raw materials to produce ethylene and propylene through thermal cracking, but the propylene yield is only about 15% by weight. FCC uses heavy oil such as vacuum gas oil (VGO) as raw material. At present, 66% of the world's propylene comes from the by-product of steam cracking to produce ethylene, and 32% comes from the catalytic cracking unit of the r...

Claims

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Application Information

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IPC IPC(8): C10G11/18
CPCC10G11/18C10G2400/20C10G2400/30C10G2300/1037
Inventor 沙有鑫龚剑洪魏晓丽李泽坤
Owner CHINA PETROLEUM & CHEM CORP