Composite solvent in use for extracting, rectifying and separating arene and method of application

A compound solvent, extractive distillation technology, applied in extraction purification/separation, refined hydrocarbon oil, petroleum industry and other directions, can solve the problems of aromatics purity, difficult operation control, and tray efficiency decline, etc., to improve aromatics recovery rate, The effect of enhancing the solubility and reducing the amount of solvent

Active Publication Date: 2005-08-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the selectivity of the co-solvent itself is still not ideal, and the boiling point is low, generally 140-200°C. 6 ~C 7 Fraction Extractive distillation has a large loss when separating aromatics, so it is not suitable for extractive distillation of fractions with a wide boiling point range
[0006] The existing extractive distillation process has certain requirements on the content of aromatics in the raw material, generally not less than 50% by mass, otherwise two liquid phases will easily form in the upper part of the extractive distillation column, the efficiency of the tray will seriously drop, and the operation will be difficult to control
A single selective solvent is used in the extractive distillation process. In the process of solvent recovery, due to the limitation of the thermal decomposition temperature of the solvent, it is difficult to completely separate the solvent from the aromatics, and the recovery rate of the aromatics cannot be very high.
In addition, the purity of aromatics is affected due to aromatics contamination due to solvolysis caused by local overheating generated during operation

Method used

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  • Composite solvent in use for extracting, rectifying and separating arene and method of application

Examples

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example 1

[0024] The C6-C7 fraction of reformed depentanized oil is used as the raw material, and its composition is listed in Table 1. according to figure 1 The shown process carries out extractive distillation to separate benzene and toluene, and the selective solvent used is the composite solvent of the present invention, wherein contains 84 mass % of sulfolane, 15 mass % of 1-methylnaphthalene and 1.0 mass % of water . The operating conditions of extractive distillation and solvent recovery tower are shown in Table 2, and the separation results are shown in Table 3.

example 2

[0026] The operation of extracting and rectifying separation of benzene and toluene was carried out according to the method of Example 1, except that the composite solvent used was 84 mass % sulfolane, 15 mass % diphenylmethane and 1.0 mass % water. The operating conditions of extractive distillation and solvent recovery tower are shown in Table 2, and the separation results are shown in Table 3.

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Abstract

A composite solvent for extraction, rectification and separation of arylhydrocarbon contains proportionally the primary solvent chosen from sulfone compound, glycol compound, N-formacyl morpholine and N-methyl pyrrolidone, the secondary solvent chosen from hydrocarbon compound with two benzene rings, and water.

Description

technical field [0001] The invention relates to a composite solvent used for extracting and rectifying to separate aromatics and a method for using it, specifically, a composite solvent for recovering high-purity aromatics from hydrocarbon mixtures by extracting and rectifying and a method for using it. Background technique [0002] At present, the methods for separating aromatics from hydrocarbon mixtures such as catalytically reformed gasoline or pyrolysis hydrogenated gasoline mainly include liquid-liquid extraction and extractive distillation. The most widely used liquid-liquid extraction methods are the Udex and Tetra processes using glycols as solvents and the Sulfolane method using sulfolane as solvents. Liquid-liquid extraction can obtain high-purity BTX products with high yield. Extractive distillation is a method of separating aromatics from hydrocarbon mixtures by utilizing the difference in the influence of solvents on the relative volatility of hydrocarbon comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/10C07C15/00C10G21/22
Inventor 田龙胜赵明唐文成盖月庭
Owner CHINA PETROLEUM & CHEM CORP
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