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

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...

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