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A kind of method of catalytic cracking diesel oil production BTX fraction

A technology for catalytic cracking of diesel oil and distillates, which is applied in the treatment of hydrocarbon oil, petroleum industry, hydrotreating process, etc. It can solve the problems of poor selectivity of BTX and achieve the effect of increasing yield

Active Publication Date: 2021-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for producing BTX cuts from catalytic cracking diesel oil to solve the technical problem of poor BTX selectivity in the process of processing LCO to produce BTX, and can effectively reduce the poisoning of hydrocracking catalysts possibility of inactivation

Method used

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  • A kind of method of catalytic cracking diesel oil production BTX fraction
  • A kind of method of catalytic cracking diesel oil production BTX fraction
  • A kind of method of catalytic cracking diesel oil production BTX fraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The raw material oil E is cut into light FCC diesel fraction EA (335°C) at the cut point of 335°C. EA enters the low-pressure hydrocracking unit, and contacts and reacts with hydrorefining catalyst A and hydrocracking catalyst B respectively. EB enters the hydrotreating unit, and the resulting liquid phase stream enters the catalytic cracking unit for reaction. The reaction product of the low-pressure hydrocracking unit and the reaction product of the catalytic cracking unit are fractionated to obtain gas, BTX-rich fraction and diesel fraction. The reaction conditions are shown in Table 2, and the product properties are shown in Table 3.

[0053] It can be seen from Table 1 that after the catalytic cracking diesel oil E is cut into EA and EB, the nitrogen content in EA is greatly reduced, and the content of nitrogen compounds that are difficult to react with carbazoles is also greatly reduced. Nitrogen removal provides favorable conditions. At the same time, the tota...

Embodiment 2

[0056] The raw material oil E is cut into light FCC diesel fraction EA (335°C) at the cut point of 335°C. EA enters the low-pressure hydrocracking unit, and contacts and reacts with hydrorefining catalyst A and hydrocracking catalyst B respectively. EB enters the hydrotreating unit, and the resulting liquid phase stream enters the catalytic cracking unit for reaction. The reaction product of the low-pressure hydrocracking unit and the reaction product of the catalytic cracking unit are fractionated to obtain gas, BTX-rich fraction and diesel fraction. The reaction conditions are shown in Table 2, and the product properties are shown in Table 3.

[0057] It can be seen from Table 3 that after optimizing the reaction conditions, the yield of the BTX-rich fraction can be further increased to 68.5%, and the yield of BTX can be increased to 31.3%.

Embodiment 3

[0059] The raw material oil E is cut into light FCC diesel fraction EA (335°C) at the cut point of 335°C. EA enters the low-pressure hydrocracking unit, and contacts and reacts with hydrorefining catalyst A and hydrocracking catalyst B respectively. EB enters the hydrotreating unit, and the resulting liquid phase stream enters the catalytic cracking unit for reaction. The reaction product of the low-pressure hydrocracking unit and the reaction product of the catalytic cracking unit are fractionated to obtain gas, BTX-rich fraction and diesel fraction. The diesel fraction obtained by fractional distillation is recycled to the low-pressure hydrocracking unit. The reaction conditions are shown in Table 2, and the product properties are shown in Table 3.

[0060] As can be seen from Table 3, the yield of the BTX-rich fraction reaches 87.2%, and the yield of BTX reaches 38.9%.

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Abstract

A method for producing BTX fractions from catalytic cracking diesel oil. The catalytic cracking diesel oil is cut into a light catalytic cracking diesel fraction and a heavy catalytic cracking diesel fraction. After the hydrogen treatment unit, the obtained liquid phase stream enters the catalytic cracking unit and reacts with the catalytic cracking catalyst. The reaction product enters the fractionation system, and after fractionation, dry gas, liquefied gas, BTX-rich fraction and diesel fraction are obtained. According to the characteristics of catalytic cracking diesel raw materials with many sulfur and nitrogen impurities and high content of aromatics, the present invention adopts the technical scheme of combined process to produce fractions rich in BTX, thereby reducing the diesel-gasoline ratio, and uses BTX fractions to fill the market gap of light aromatics in my country .

Description

technical field [0001] The invention relates to a method for producing BTX fraction by catalytically cracking diesel oil. Background technique [0002] As crude oil becomes increasingly inferior, more and more heavy components of vacuum gas oil and even residual oil are used as raw materials for fluid catalytic cracking (FCC) units, which leads to an increasing degree of conversion of raw materials. Catalytic cracked diesel oil (LCO) fractionated from the FCC unit has the characteristics of high content of sulfur and nitrogen impurities and high content of aromatics. It is difficult to meet the requirements of clean fuel through traditional hydrofining and hydroupgrading processes, and LCO is rich in The aromatic components contained in LCO cannot be effectively utilized, and it is becoming more and more important to find new ways to process LCO. [0003] On the other hand, the production of BTX (benzene, toluene, xylene) at home and abroad is mainly based on the catalytic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G69/00
CPCC10G69/00C10G2300/1037
Inventor 严张艳任亮胡志海吴昊张毓莹许双辰杨平
Owner CHINA PETROLEUM & CHEM CORP
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