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Composite solvent for extracting and separating aromatics and alkanes in diesel fraction and application method thereof

A compound solvent and fraction technology is applied in the field of extraction and separation of aromatic hydrocarbons, and the extraction solvent field of aromatic hydrocarbons in diesel fractions. Increased selective solubility and improved cetane number

Active Publication Date: 2015-09-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The method of solvent extraction can effectively separate the aromatic components in diesel oil and increase the cetane number of diesel fractions. However, in the current research on diesel oil solvent extraction and upgrading, solvents for the extraction of aromatics from gasoline fractions are mostly used, such as Sulfolane, NMP, etc. Although these solvents can separate some aromatics from diesel fractions to a certain extent, there are some application problems, mainly manifested in: poor selectivity, high alkane content in extracted aromatics, and for aromatics content High diesel fractions (such as LCO with an aromatic content higher than 70%) will cause miscibility between solvents and raw materials, making it difficult to separate layers; thermal and chemical stability are poor, and side reactions such as decomposition and oxidation are prone to occur. The conditions are relatively high; there will be certain residues in the product, which will affect the sulfur and nitrogen content of the oil and other indicators

Method used

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  • Composite solvent for extracting and separating aromatics and alkanes in diesel fraction and application method thereof
  • Composite solvent for extracting and separating aromatics and alkanes in diesel fraction and application method thereof
  • Composite solvent for extracting and separating aromatics and alkanes in diesel fraction and application method thereof

Examples

Experimental program
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Effect test

example 1

[0040] With 1-heptyl-3-methylimidazolium tetrafluoroborate A ([C 7 MIM]BF 4 ) as the main solvent, and N, N-dimethylformamide (DMF) as the co-solvent, for the diesel fraction Ⅰ according to figure 1 The extraction process is carried out to separate the aromatics and alkanes in it. The composition of the diesel fraction I used is shown in Table 1, the control conditions of each tower in the extraction operation, the extraction solvent used, the stripping agent and the amount used are shown in Table 2, and the composition of the obtained raffinate and extracted oil is shown in Table 3.

example 2

[0042] Diesel fraction I is extracted by the method of Example 1, and the aromatics and alkanes therein are separated. The difference is to change the mass ratio of the main solvent and the auxiliary solvent, the control conditions of each tower in the extraction operation, the used extraction solvent, stripping agent and consumption. See Table 2, and the composition of the obtained raffinate oil and extracted oil is shown in Table 3.

example 3

[0044] Diesel fraction I is extracted by the method of example 1, and aromatic hydrocarbon and alkane are separated wherein, difference is the amount of composite solvent used when increasing extraction, each tower control condition of extraction operation, used extraction solvent, stripping agent and The dosage is shown in Table 2, and the composition of the obtained raffinate oil and extracted oil is shown in Table 3.

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Abstract

The invention relates to a composite solvent for extracting and separating aromatics and alkanes in a diesel fraction, which comprises an ionic liquid and an organic solvent, wherein the structure of the cation of the ionic liquid is disclosed as Formula (I) or Formula (II), and the anion is BF<4->, PF<6->, p-methylbenzenesulfonate, bistrifluoromethanesulfonimide, nonafluorobutylsulfonate, dodecyl sulfonate, acetate or sulfate. In the Formula (I), R1 is C4-C8 alkyl group, and R2 is C1-C3 alkyl group. In the Formula (II), R3 is C1-C8 alkyl group, and R4 is C1-C4 alkyl group. The organic solvent is N,N-dimethylformamide, N,N-dimethylacetamide or sulfolane. The composite extraction solvent has high aromatic solubility, and can effectively separate the aromatics in the diesel fraction, thereby enhancing the cetane number of the diesel fraction.

Description

technical field [0001] The invention relates to a composite solvent for extracting and separating aromatics and alkanes in diesel oil fractions and an application method thereof, specifically, an extraction solvent suitable for separating aromatics in diesel oil fractions and using the compounded ionic liquid and a conventional solvent. A method for extracting and separating aromatics with a solvent. Background technique [0002] Under the general situation of developing low-carbon economy, circular economy, and realizing sustainable development, the pace of oil product quality upgrading has been significantly accelerated, and the control of vehicle exhaust emissions in the new environmental protection regulations has higher and higher requirements for diesel quality, especially for diesel The requirements for medium aromatics content and cetane number are becoming more and more stringent. In my country, catalytic cracking light cycle oil (LCO) is usually used as a blending...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/58C07D213/18C10G53/04
Inventor 侯昭祥史军军葸雷吴巍邹琥朱宁杜鹏果卉
Owner CHINA PETROLEUM & CHEM CORP