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System and method for separating polycyclic aromatic hydrocarbon by using deep eutectic solvent

A technology for deep eutectic solvents and polycyclic aromatic hydrocarbons, which is applied in the fields of refining and treating hydrocarbon oil with two or more solvents, and the petroleum industry. And other issues

Active Publication Date: 2021-04-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deep eutectic solvent is operated as the extraction solvent in the batch distillation column and cannot be operated continuously
[0005] Polycyclic aromatic hydrocarbons have a large molecular weight and a higher boiling point than ordinary organic raw materials. Distillation or rectification usually requires a heating temperature of 250-350°C under one atmospheric pressure, so the energy consumption is high; at the same time, polycyclic aromatic hydrocarbons Aromatic hydrocarbons tend to continue to undergo side reactions such as condensation, making the quality of polycyclic aromatic hydrocarbons worse
Therefore, direct distillation or rectification cannot meet the continuous and stable operation of polycyclic aromatic hydrocarbons.

Method used

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  • System and method for separating polycyclic aromatic hydrocarbon by using deep eutectic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Building system: the system for separating polycyclic aromatic hydrocarbons with deep eutectic solvents includes polycyclic aromatic hydrocarbons separation unit A tower, polycyclic aromatic hydrocarbons removal unit B tower, deep eutectic solvent regeneration unit C tower; wherein, the polycyclic aromatic hydrocarbons separation unit A Tower one outlet is connected to said polycyclic aromatic hydrocarbons removal unit B tower one inlet through pipeline 3;

[0044] An outlet of the polycyclic aromatic hydrocarbon removal unit B tower is connected to an inlet of the deep eutectic solvent regeneration unit C tower through a pipeline 5, and the deep eutectic solvent regeneration unit C tower includes two outlets, and an outlet is connected by a pipeline 7 A tower top inlet is connected to the PAH removal unit B tower, and the other outlet is connected to an inlet of the PAH separation unit A tower through a line 6.

[0045] The method of carrying out deep eutectic solvent ...

Embodiment 2

[0050] The same system as in Example 1 was used.

[0051] The method of carrying out deep eutectic solvent separation polycyclic aromatic hydrocarbons:

[0052] Using the raw oil with the same composition as in Example 1, the mass composition of the stream is 7% non-aromatic, 39% monocyclic aromatics, and 54% polycyclic aromatics. The raw oil is introduced into tower A of PAH separation unit through pipeline 1, and fresh deep eutectic solvent is introduced into tower A through pipeline 6 through the top of the tower. The solvent is obtained by mixing and stirring at 60°C before use. The solvent is composed of methyltriphenylphosphonium bromide / dimethylformamide with a molar ratio of 1 / 3 and the addition of SnCl with a mass of 1% of the total mass of the deep eutectic solvent. 2 composition. The volume ratio of the deep eutectic solvent to the oil to be extracted is 1 / 1.5. After extraction, the side line 2 produces a mixed component of single-ring aromatics and non-aromatics....

Embodiment 3

[0056] The same system as in Example 1 was used.

[0057] The method of carrying out deep eutectic solvent separation polycyclic aromatic hydrocarbons:

[0058] Using the raw oil with the same composition as in Example 1, the mass composition of the stream is 7% non-aromatic, 39% monocyclic aromatics, and 54% polycyclic aromatics. The raw oil is introduced into tower A of PAH separation unit through pipeline 1, and fresh deep eutectic solvent is introduced into tower A through pipeline 6 through the top of the tower. The solvent is obtained by mixing and stirring at 60°C before use. The solvent consists of methyltriphenylphosphonium bromide / succinic acid with a molar ratio of 1 / 3 and the addition of SnCl with a mass of 1% of the total mass of the deep eutectic solvent. 2 Composition, the volume ratio of the deep eutectic solvent to the oil to be extracted is 1 / 1.5, after extraction, the side line 2 produces a mixed component of single-ring aromatics and non-aromatics, the pre...

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Abstract

The invention relates to a system and a method for separating polycyclic aromatic hydrocarbon by using a deep eutectic solvent in the field of separation of polycyclic aromatic hydrocarbon in petroleum or petroleum fractions. The system for separating polycyclic aromatic hydrocarbon by the deep eutectic solvent can comprise a polycyclic aromatic hydrocarbon separation unit and a polycyclic aromatic hydrocarbon removal unit, wherein an outlet of the polycyclic aromatic hydrocarbon separation unit is connected with an inlet of the polycyclic aromatic hydrocarbon removal unit; a to-be-extracted oil product and the deep eutectic solvent are respectively introduced into the polycyclic aromatic hydrocarbon separation unit to undergo a liquid-liquid extraction process, a mixture flow of monocyclic aromatic hydrocarbon and non-aromatic hydrocarbon obtained after extraction is extracted, at the same time the obtained mixture flow of polycyclic aromatic hydrocarbon and the deep eutectic solvent enters the polycyclic aromatic hydrocarbon removal unit, and after contact with a second solvent, the obtained polycyclic aromatic hydrocarbon is extracted, and a mixture flow of the deep eutectic solvent and the second solvent obtained at the same time flow outs of the polycyclic aromatic hydrocarbon removal unit; by means of the technical scheme, separation of polycyclic aromatic hydrocarbon by the deep eutectic solvent can be achieved.

Description

technical field [0001] The invention relates to the field of separation of polycyclic aromatic hydrocarbons in petroleum or petroleum fractions, and more particularly relates to a system and method for separating polycyclic aromatic hydrocarbons with a deep eutectic solvent. Background technique [0002] The separation of aromatics and non-aromatics is an important part of industrial production. In industrial practice, the stream after the reaction contains not only aromatics, but also non-aromatic components such as alkanes, cycloalkanes, and trace olefins. These non-aromatic components have a boiling point close to that of aromatics, and they tend to form azeotropes, which increases the difficulty of separation. The solvent extraction and extractive distillation technologies developed in the current industry have good separation effects and have been widely used. However, there are problems such as high energy consumption, easy deterioration of extraction solvents, and eas...

Claims

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Application Information

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IPC IPC(8): C10G21/02
CPCC10G21/02C10G2300/4006C10G2300/4012C10G2300/44
Inventor 宋奇郑均林姜向东王宗霜
Owner CHINA PETROLEUM & CHEM CORP
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