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

A composite solvent and distillate technology, which is applied in the field of extraction and separation of aromatics in the separation of aromatics in diesel fractions, can solve problems affecting the sulfur and nitrogen content of oil products, high alkane content, product residues, etc., and achieve increased selective solubility , the effect of reducing the content of aromatics and increasing the cetane number

Active Publication Date: 2018-02-23
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 its application method
  • Composite solvent for extracting and separating aromatics and alkanes in diesel fraction and its application method
  • Composite solvent for extracting and separating aromatics and alkanes in diesel fraction and its application method

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

A composite solvent for extracting and separating aromatics and alkanes in diesel fractions, including ionic liquids and organic solvents, the cations of the ionic liquids have the structure of formula (I) or formula (II), and the anions are BF4‑, PF6‑, p-toluenesulfonate, bistrifluoromethanesulfonimide, nonafluorobutanesulfonate, dodecylsulfonate, acetate or sulfate, in formula (I), R1 is C4~C8 alkyl , R2 is a C1-C3 alkyl group, in formula (II), R3 is a C1-C8 alkyl group, R4 is a C1-C4 alkyl group, and the organic solvent is N, N-dimethylformamide, N,N-Dimethylacetamide or sulfolane. The composite extraction solvent has good aromatic hydrocarbon solubility, can effectively separate the aromatic hydrocarbons in the diesel fraction, and increases 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 Patents(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