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Hydrogenation method for producing BTX fraction from catalytic cracking diesel oil

A technology for catalytic cracking of diesel oil and distillates, which can be used in hydrotreating process, hydrocarbon oil treatment products, petroleum industry, etc., and can solve the problems of poor selectivity of BTX

Active Publication Date: 2019-12-10
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, provide a kind of method that catalytic cracking diesel oil produces BTX cut, to solve the technical problem of poor selectivity of BTX in the process of processing LCO to produce BTX

Method used

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  • Hydrogenation method for producing BTX fraction from catalytic cracking diesel oil
  • Hydrogenation method for producing BTX fraction from catalytic cracking diesel oil
  • Hydrogenation method for producing BTX fraction from catalytic cracking diesel oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The feed oil C is cut into light FCC diesel fraction CA (324°C) at the cut point of 324°C. CA enters the low-pressure hydrocracking unit, and contacts and reacts with hydrofinishing catalyst A and hydrocracking catalyst B in turn. In the low-pressure hydrocracking unit, the denitrification and aromatic hydrocarbon saturation depth of the hydrofinishing reaction zone I are controlled, so that the nitrogen content in the liquid-phase reaction effluent of the hydrofinishing reaction zone I is reduced to below 20 μg / g. CB enters the medium-pressure hydrocracking unit, and contacts and reacts with hydrofinishing catalyst A and hydrocracking catalyst B in sequence. The reaction product of the low-pressure hydrocracking unit is fractionated together with the reaction product of the medium-pressure hydrocracking unit to obtain a gaseous, BTX-enriched fraction and a diesel fraction. The reaction conditions are as shown in Table 3, and the product properties are as shown in Tabl...

Embodiment 2

[0057] The feed oil C is cut into light FCC diesel fraction Ca (300°C) at a cut point of 300°C. Ca enters the low-pressure hydrocracking unit, and successively contacts and reacts with hydrofinishing catalyst A and hydrocracking catalyst B. The nitrogen content in the liquid phase reaction effluent from reaction zone I is reduced to below 20 μg / g. Cb enters the medium-pressure hydrocracking unit, and successively contacts and reacts with hydrofinishing catalyst A and hydrocracking catalyst B. The reaction product of the low-pressure hydrocracking unit is fractionated together with the reaction product of the medium-pressure hydrocracking unit to obtain a gaseous, BTX-enriched fraction and a diesel fraction. The reaction conditions are as shown in Table 3, and the product properties are as shown in Table 4.

[0058] It can be seen from Table 4 that when the cutting temperature of feed oil C is lower than the upper limit T of the cutting point, the nitrogen content of the ligh...

Embodiment 3

[0063] The feed oil C is cut into light FCC diesel fraction CA (324°C) at the cut point of 324°C. CA enters the low-pressure hydrocracking unit, and contacts and reacts with hydrofinishing catalyst A and hydrocracking catalyst B in turn. In the low-pressure hydrocracking unit, the denitrification and aromatic hydrocarbon saturation depth of the hydrofinishing reaction zone I are controlled, so that the nitrogen content in the liquid-phase reaction effluent of the hydrofinishing reaction zone I is reduced to below 20 μg / g. CB enters the medium-pressure hydrocracking unit, and contacts and reacts with hydrofinishing catalyst A and hydrocracking catalyst B in sequence. The reaction product of the low-pressure hydrocracking unit is fractionated together with the reaction product of the medium-pressure hydrocracking unit to obtain a gaseous, BTX-enriched fraction and a diesel fraction. Some of the diesel fractions are all recycled to the raw material system. The reaction conditio...

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Abstract

A hydrogenation method for producing a BTX fraction from catalytic cracking diesel oil comprises the steps: catalytic cracking diesel oil is divided into a light catalytic cracking diesel oil fractionand a heavy catalytic cracking diesel oil fraction; the light catalytic cracking diesel oil fraction enters a low-pressure hydrocracking unit for reaction, the heavy catalytic cracking diesel oil fraction enters a hydrotreating unit, an obtained liquid phase material flow enters a catalytic cracking unit and makes contact with a catalytic cracking catalyst for reaction; and the reaction product enters a fractionation system, and after fractionation, dry gas, liquefied gas, a BTX-rich fraction and a diesel oil fraction are obtained. According to the characteristics of high sulfur and nitrogenimpurities and high aromatics content in the catalytic cracking diesel raw material, the technical scheme of combined process is used for producing the BTX-rich fraction, so as to reduce the ratio ofdiesel oil to steam, and adopts the BTX fraction to fill the market gap of light aromatics in China.

Description

technical field [0001] The invention relates to a hydrogenation method for producing BTX fraction by catalytic 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/12
CPCC10G65/12C10G2300/1037C10G2300/4006C10G2300/4012C10G2300/4018C10G2400/30
Inventor 胡志海严张艳任亮吴昊张毓莹梁家林许双辰
Owner CHINA PETROLEUM & CHEM CORP
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