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Method for desolventizing raffinate oil extracted from aromatics

An extraction solvent and aromatic hydrocarbon extraction technology, which is applied in the field of desolvation of aromatic hydrocarbon extraction raffinate oil, can solve the problems of large water consumption, poor removal effect and high processing cost

Active Publication Date: 2021-12-10
BEIJING ENERGY ENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for desolventizing aromatics extraction raffinate in order to overcome the poor solvent removal effect of aromatics extraction raffinate in the prior art, large water consumption and high processing cost. Not only can effectively remove the extraction solvent in the raffinate oil, but also requires less water and lower processing costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0043] According to a preferred embodiment of the present invention, the washing water is recycled as step (1) water.

[0044] The method for desolventizing the raffinate oil extracted from aromatic hydrocarbons of the present invention can not only significantly reduce the consumption of water, but also completely remove the solvent in the raffinate oil extracted from aromatic hydrocarbons.

[0045] The present invention will be described in detail below in conjunction with the examples, but the present invention is not limited thereto.

[0046] In the aromatics extraction raffinate containing extraction solvent used in the following examples and comparative examples, the extraction solvent is sulfolane, and its content is 1.5% by weight. The composition of the aromatics extraction raffinate is shown in Table 1 below.

[0047] Table 1

[0048] Content, wt% C5-C8 alkanes 51.5 C5-C8 naphthenes 5.8 C5-C8 alkenes 42.6 C6-C8 aromatics 0.1 s...

Embodiment 1

[0050] (1) Mix the aromatics extraction raffinate containing the extraction solvent with water, the weight ratio of the aromatics extraction raffinate containing the extraction solvent to water is 10:1, and then pass it into the first separator with a Water non-woven fabric (commercially available) is used for the first separation, the temperature of the first separation is 50°C, the pressure is 0.5MPa, water and extraction solvent pass through the hydrophilic non-woven fabric, and the raffinate oil is blocked in the hydrophilic non-woven fabric. Outside the non-woven fabric, the top of the first separator obtains stream a (containing 0.05% by weight of extraction solvent), and the bottom obtains stream b;

[0051] (2) Pass stream a into a water washing tower for washing. The conditions for washing include: the mass ratio of stream a to water is 0.2:1, and the temperature is 40°C to obtain stream c (the content of the extraction solvent is 8 μg / g) and washing water;

[0052] ...

Embodiment 2

[0059] (1) Mix the aromatic hydrocarbon extraction raffinate containing the extraction solvent with water, the weight ratio of the aromatic hydrocarbon extraction raffinate containing the extraction solvent to water is 8:1, and then pass it into the first separator with a Water non-woven fabric (commercially available) is used for the first separation, the temperature of the first separation is 70°C, the pressure is 0.4MPa, water and extraction solvent pass through the hydrophilic non-woven fabric, and the raffinate oil is blocked in the hydrophilic non-woven fabric. Outside the non-woven fabric, the top of the first separator obtains stream a (containing 0.03% by weight of extraction solvent), and the bottom obtains stream b;

[0060] (2) Pass stream a into a water washing tower for water washing. The conditions for washing include: the mass ratio of stream a to water is 0.1:1, and the temperature is 70°C to obtain stream c (the content of the extraction solvent is 6 μg / g) and...

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Abstract

The invention relates to the field of aromatic hydrocarbon extraction, and discloses a method for desolventizing aromatic hydrocarbon extraction raffinate, the method comprising: (1) mixing aromatic hydrocarbon extraction raffinate containing an extraction solvent with water to obtain a mixture, and then The mixture is subjected to first separation to obtain stream a and stream b, stream a contains raffinate oil and a small amount of extraction solvent, stream b contains water and extract solvent; (2) stream a is washed with water to obtain Stream c and washing water; (3) second separation of stream c to obtain raffinate oil. The method for desolventizing raffinate oil extracted by aromatic hydrocarbons provided by the present invention can not only effectively remove the extraction solvent in the raffinate oil, but also realize the purpose of removing the extraction solvent in the raffinate oil under low energy consumption.

Description

technical field [0001] The invention relates to the field of aromatic hydrocarbon extraction, in particular to a solvent removal method for aromatic hydrocarbon extraction raffinate. Background technique [0002] Aromatics extraction is to use extraction solvent to extract aromatics from hydrocarbon mixture. In the existing aromatics extraction process, the separation is mainly based on the different selectivity of the extraction solvent for aromatics and non-aromatics. The main process is to fully contact the extraction solvent with the extraction raw material, and the extraction solvent will extract The benzene and toluene in the raw material are fully absorbed, while the non-aromatic hydrocarbons are extracted from the top of the tower through vaporization, and the non-aromatic hydrocarbons at the top of the tower are called raffinate oil. During the extraction process, since the raffinate oil is also in contact with the extraction solvent, the raffinate oil product at t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/10C10G21/28B01D17/00
CPCB01D17/085C10G21/28C10G2300/1096C10G2300/44
Inventor 曲良龙耿新水姚伟
Owner BEIJING ENERGY ENG TECH