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Multistage cross-flow extraction device and method for catalyzing diesel polycyclic aromatic hydrocarbon by using ionic liquid

A technology of ionic liquid and catalytic diesel oil, which is applied in the treatment of hydrocarbon oil, petroleum industry, refined hydrocarbon oil, etc., and can solve the problems of light distillate oil reduction, economic loss, and increase in the load of catalytic devices, etc.

Pending Publication Date: 2021-07-30
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 unit for reaction without fractionation, which undoubtedly increases the load on the catalytic unit and affects the processing capacity of the unit; secondly, the hydrocracking reaction effluent contains a certain amount of light components, This part of the light components will undergo secondary reactions after entering the catalytic device, 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 cross-flow extraction device and method for catalyzing diesel polycyclic aromatic hydrocarbon by using ionic liquid
  • Multistage cross-flow extraction device and method for catalyzing diesel polycyclic aromatic hydrocarbon by using ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Common ionic liquids (specifically [BMIM][BF4]) were used as extractants.

[0036] The feed flow rate is 100kg / h, and the feed contains 70% (mass fraction) of n-hexadecane and 30% (mass fraction) of 1-methylnaphthalene. The feed position of diesel condensed ring aromatic mixture is the bottom of the first-stage extractor (C1), the feed position of common ionic liquid is the top of the first-stage extractor (C1), and the top of the first-stage extractor (C1) takes The output liquid enters the second-stage extractor (C2) from the bottom, and the ordinary ionic liquid enters the second-stage extractor (C2) from the top. The volume ratio of the ordinary ionic liquid to the diesel aromatics to be separated during each stage of extraction is The ratio is 1:1. After multi-stage separation, the recovery rate of n-hexadecane is 99.50%, and the recovery rate of 1-methylnaphthalene is 98.90%. The purity of n-hexadecane in the S1 top extract is 99.8% (mass fraction), and the purit...

Embodiment 2

[0038] A mixed ionic liquid (specifically [BMIM][BF4] and [EMIM][BF4] with a volume ratio of 1:1) was used as the extractant.

[0039] The feed flow rate is 100kg / h, and the feed contains 80% (mass fraction) of n-hexadecane and 20% (mass fraction) of 1-methylnaphthalene. The feed position of the diesel aromatics mixture is the bottom of the first-stage extractor (C1), the feed position of the mixed ionic liquid is the top of the first-stage extractor (C1), and the output liquid from the top of the first-stage extractor (C1) Enter the second-stage extractor (C2) from the bottom, and the ionic liquid enters the second-stage extractor (C2) from the top. The volume ratio of the ionic liquid to the diesel aromatics to be separated during each stage of extraction is 1:1. , the recovery rate of n-hexadecane after multistage separation is 99.60%, and the recovery rate of 1-methylnaphthalene is 99.10%. The purity of n-hexadecane in the S1 top extract is 99.8% (mass fraction), and the ...

Embodiment 3

[0041] 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 extraction agent.

[0042] The feed flow rate is 100kg / h, and the feed contains 75% (mass fraction) of n-hexadecane and 25% (mass fraction) of 1-methylnaphthalene. The feed position of the diesel aromatic mixture is the bottom of the first-stage extractor (C1), the feed position of the mixed extractant is the top of the first-stage extractor (C1), and the production liquid at the top of the first-stage extractor (C1) Enter the second-stage extractor (C2) from the bottom, and the mixed extractant enters the second-stage extractor (C2) from the top, and the volume ratio of the mixed extractant and the diesel aromatic hydrocarbon to be separated during each stage of extraction is 2 : 1, the recovery rate of n-hexadecane after multistage separation is 99.8%, and the recovery rate of 1-methy...

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Abstract

The invention discloses a multistage cross-flow 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. The efficient separation of the catalytic diesel polycyclic aromatic hydrocarbon mixture is realized by adopting a solvent multistage cross-flow extraction method and an extraction agent based on the ionic liquid. The method comprises the steps that catalytic diesel aromatic hydrocarbon to be separated enters a first-stage extractor (C1) from the bottom, an extracting agent A1 enters the first-stage extractor (C1) from the top, and the top of the first-stage extractor (C1) is connected to the bottom of a second-stage extractor (C2); an extraction agent A2 enters a second-stage extractor (C2) from the top, and the bottoms of the first-stage extractor (C1) and the second-stage extractor (C2) are connected with the middle of an extraction liquid flash tank (S2) for flash separation; and a material flow at the top of the second-stage extractor (C2) is connected to the middle part of a raffinate flash tank (S1) for flash separation. According to the method, the problem that the solvent and the raw materials are mixed and dissolved is solved, the yield of an oil product is increased, the purity of the separated oil product is high, and the diesel oil component with high cetane number and the aromatic hydrocarbon with low alkane content are obtained.

Description

technical field [0001] The invention relates to a multistage cross-flow extraction device and method for catalyzed diesel polycyclic 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 invention belongs to the technical field of chemical separation and purification. Background technique [0002] Under the general trend of developing a low-carbon circular economy and achieving sustainable environmental development, the pace of diesel quality upgrading has been significantly accelerated, especially the restrictions on cetane number and polycyclic aromatic hydrocarbons will become more and more stringent. Most of my country's crude oil is relatively heavy, and there is a lack of light raw materials for the production of aromatics and olefins. Catalytic cracking is an important means of lightening heavy oil. It h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G21/27C10G21/28
CPCC10G21/27C10G21/28C10G2300/307
Inventor 雷志刚李国选刘清华
Owner BEIJING UNIV OF CHEM TECH
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