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A device and method for liquid-liquid extraction and separation of aromatics in diesel oil

A technology for diesel and aromatic hydrocarbons, which is applied in the petroleum industry, refined hydrocarbon oil, and multi-stage series-connected refining process treatment. The effect of diesel quality, improved separation efficiency, and ease of operation

Active Publication Date: 2016-01-20
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, most of the solvents used for the extraction of aromatics in gasoline fractions are used, such as Sulfolane, NMP, etc. require a large ratio of solvent to oil, and the solvent recovery process is complicated, and for diesel fractions with high aromatic content (such as LCO with aromatic content higher than 70%), the solvent and raw materials will be miscible, making it difficult to separate separate

Method used

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  • A device and method for liquid-liquid extraction and separation of aromatics in diesel oil
  • A device and method for liquid-liquid extraction and separation of aromatics in diesel oil
  • A device and method for liquid-liquid extraction and separation of aromatics in diesel oil

Examples

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Effect test

example 1

[0034] according to figure 1The process shown in Table 1 performs liquid-liquid extraction to separate the aromatics in the diesel feedstock with the properties listed in Table 1. The height of the liquid-liquid extraction tower is H, and the height of the part with a small diameter on the upper part is H. 1 . The extraction solvent is DMF (N, N-dimethylformamide), which is injected into the upper part of the liquid-liquid extraction tower. The co-solvent is water, which is injected at the top of the lower part of the tower. The distance between the co-solvent injection point and the bottom of the liquid-liquid extraction tower is The distance is H 2 . The shape and size of the liquid-liquid extraction tower, operating conditions, and the location and amount of co-solvent injection are shown in Table 2. The operating temperature of the solvent recovery tower is 110°C and the pressure is 30kPa. After the aromatics are extracted, the non-aromatics are discharged from the top ...

example 2

[0036] Carry out liquid-liquid extraction and separation of aromatics therein to the diesel oil feedstock listed in Table 1 by the method of Example 1, the difference is to change the consumption of extraction solvent, co-solvent feeding position and consumption. See Table 2 for the shape and size of the liquid-liquid extraction tower, operating conditions, injection location and dosage of co-solvent. The composition of raffinate oil and extracted oil is shown in Table 3.

example 3

[0038] Carry out liquid-liquid extraction and separation of aromatics therein to the diesel oil feedstock listed in table 1 by the method of example 1, difference is to change the diameter ratio of the upper and lower parts of the liquid-liquid extraction tower, change the extraction solvent into ethylene glycol methyl ether, and Change its dosage. See Table 2 for the shape and size of the liquid-liquid extraction tower, operating conditions, injection location and dosage of co-solvent. The composition of raffinate oil and extracted oil is shown in Table 3.

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Abstract

The invention provides an apparatus for separating aromatic hydrocarbons in diesel oil through liquid-liquid extraction. The apparatus comprises a liquid-liquid extracting tower (1), a raffinate oil washing tower (2) and a solvent recovery tower (3), wherein a ratio of the diameter D1 of the upper part of the liquid-liquid extracting tower (1) to the diameter D2 of the lower part of the liquid-liquid extracting tower (1) is 0.5 to 0.9, the lower part of the liquid-liquid extracting tower (1) is provided with a raw material feeding pipeline (4), the upper part of the liquid-liquid extracting tower (1) is provided with an extracting solvent feeding pipeline, a top raffinate oil pipeline (7) is connected with the bottom of the raffinate oil washing tower (2), an extract pipeline (11) at the bottom of the liquid-liquid extracting tower (1) is connected with the solvent recovery tower (3), the top of the raffinate oil washing tower (2) is provided with a product discharging pipeline (9), and the bottom of the raffinate oil washing tower (2) is provided with a water draining pipeline (10). The apparatus is used for separating aromatic hydrocarbons in diesel oil through liquid-liquid extraction; through cooperative usage of the apparatus and proper solvents and cosolvents, diesel oil with a high cetane value can be produced, and aromatic hydrocarbons with low alkane content can be obtained.

Description

technical field [0001] The invention relates to a device and method for liquid-liquid extraction and separation of aromatics, in particular, a device and method for separating aromatics from diesel oil with high aromatic content. 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 diesel (also known as light cycle oil, LCO) accounts for about 20-30% of the total finished diesel and has become an important part of the diesel pool. However, due to the increasing operating severity of domestic catalytic c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/04C10G21/06
Inventor 葛晓蓉史军军邹琥葸雷朱宁果卉马秀艳
Owner CHINA PETROLEUM & CHEM CORP
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