Multistage countercurrent extraction device and method for catalyzing diesel polycyclic aromatic hydrocarbon by using ionic liquid

A technology of ionic liquid and polycyclic aromatic hydrocarbons, which is applied in the direction of multi-stage series refining process, hydrocarbon oil treatment, petroleum industry, etc., can solve the problem of increasing the load of catalytic cracking unit, affecting the processing capacity of the unit, and reducing light distillate oil To achieve the effect of increasing the cetane number, convenient operation and reducing the content of polycyclic aromatic hydrocarbons

Pending Publication Date: 2021-08-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the hydrocracking reaction effluent directly enters the catalytic cracking unit for reaction without fractionation, which undoubtedly increases the load on the catalytic cracking unit and affects the processing capacity of the unit; secondly, the hydrocracking reaction effluent contains a certain amount of light components After this part of light components enter the catalytic cracking unit, secondary reactions will occur, resulting in a decrease in light distillate oil and an increase in gas yield, resulting in certain economic losses

Method used

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  • Multistage countercurrent extraction device and method for catalyzing diesel polycyclic aromatic hydrocarbon by using ionic liquid
  • Multistage countercurrent extraction device and method for catalyzing diesel polycyclic aromatic hydrocarbon by using ionic liquid
  • Multistage countercurrent extraction device and method for catalyzing diesel polycyclic aromatic hydrocarbon by using ionic liquid

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Experimental program
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Effect test

Embodiment 1

[0036] A single ionic liquid (specifically [BMIM][BF4]) was used as the extractant.

[0037]The feed flow rate was 100 kg / h, and the feed contained 70% (mass fraction) of n-hexadecane and 30% (mass fraction) of 1-methylnaphthalene. The theoretical plate number of the countercurrent mixing extraction tower (C1) is 6, the feed position of the diesel aromatics mixture is the 6th block, and the single ionic liquid is fed from the first plate position of the countercurrent mixing extraction tower (C1), and the extraction process The volume ratio of the medium ionic liquid to the feed of the diesel aromatics to be separated is 1:1, and the recovery rate of n-hexadecane and 1-methylnaphthalene is 99.65% and 99.20% after high-efficiency separation. The purity of n-hexadecane in the extract was 99.9% (mass fraction), and the purity of 1-methylnaphthalene in the raffinate was 98.9% (mass fraction).

Embodiment 2

[0039] Mixed ionic liquids (specifically [BMIM][BF4] and [EMIM][BF4] with a volume ratio of 1:1) were used as extractants.

[0040] The feed flow rate was 100 kg / h, and the feed contained 80% (mass fraction) of n-hexadecane and 20% (mass fraction) of 1-methylnaphthalene. The number of theoretical plates of the countercurrent mixing extraction tower (C1) is 5, the feed position of the diesel aromatics mixture is the 5th, and the mixed ionic liquid enters the countercurrent mixing extraction tower (C1) from the position of the second plate, and the mixture is mixed during the extraction process. The volume ratio of the ionic liquid to the feedstock of diesel aromatics to be separated is 0.5:1, the recovery rate of n-hexadecane and 1-methylnaphthalene are 99.46% and 98.8% after high-efficiency separation. The purity of n-hexadecane in the extract was 99.5% (mass fraction), and the purity of 1-methylnaphthalene in the raffinate was 98.9% (mass fraction).

Embodiment 3

[0042] A mixed solution of common ionic liquid (specifically [BMIM][BF4]) + organic solvent (specifically, sulfolane) (the volume ratio of ionic liquid to organic solvent is 3:7) was used as the extractant.

[0043] The feed flow rate was 100 kg / h, and the feed contained 75% (mass fraction) of n-hexadecane and 25% (mass fraction) of 1-methylnaphthalene. The number of theoretical plates of the countercurrent mixing extraction tower (C1) is 6, the feed position of the diesel aromatics mixture is the 5th block, and the mixture of ionic liquid and traditional organic solvent enters the countercurrent mixing extraction tower (C1) from the 2nd block, extracting During the process, the volume ratio of the mixed extractant to the feed of the diesel aromatics to be separated is 1.5:1, and the recovery rate of n-hexadecane and 1-methylnaphthalene is 99.72% and 99.27% ​​after high-efficiency separation. The purity of n-hexadecane in the extract was 99.85% (mass fraction), and the purity ...

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Abstract

The invention discloses a multistage countercurrent extraction device and method for catalyzing diesel polycyclic aromatic hydrocarbon by using ionic liquid, and belongs to the technical field of chemical separation and purification. Through a solvent multistage countercurrent extraction technology and an ionic liquid extraction agent, efficient separation of the catalytic diesel aromatic hydrocarbon mixture is realized. The method comprises the steps that a diesel aromatic hydrocarbon to-be-separated mixture enters a countercurrent mixed extraction tower (C1) from the tower bottom, an extraction agent S enters the countercurrent mixed extraction tower (C1) from the tower top, a material flow at the bottom of the countercurrent mixed extraction tower (C1) is connected with the middle of an extraction liquid flash tank (S2) for flash separation, a material flow at the tower top of the countercurrent mixed extraction tower (C1) is connected with the middle of a raffinate flash tank (S1) for flash separation, and extraction solvent outlets at the bottoms of the raffinate flash tank (S1) and the extract flash tank (S2) are connected with an extraction solvent circulating material flow at the extraction solvent feed port of the countercurrent mixed extraction tower (C1). The problem of miscibility of the solvent and the raw materials is solved, the yield of oil products is improved, and the product purity is high.

Description

technical field [0001] The invention relates to a multi-stage countercurrent extraction device and method for catalytic diesel fused-ring aromatic hydrocarbons using ionic liquid. The ionic liquid extractant can be a single ionic liquid, a mixed ionic liquid, a mixture of an ionic liquid and a traditional organic solvent, or a functional ionic liquid. The technical field of chemical separation and purification. Background technique [0002] Under the general trend of developing a low-carbon circular economy and realizing sustainable development of the environment, the pace of diesel quality upgrading is significantly accelerated, especially the restrictions on cetane number and polycyclic aromatic hydrocarbons will become more and more strict. Most of my country's crude oil is heavy and lacks light feedstocks for the production of aromatics and olefins. Catalytic cracking is an important means of lightening heavy oil. It has the advantages of strong adaptability of raw mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G53/04
CPCC10G53/04C10G2300/1037
Inventor 雷志刚李国选刘清华
Owner BEIJING UNIV OF CHEM TECH
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