Method of using polyethylene imine to extract and separate phenolic substances from coal tar

A technology of polyethyleneimine and phenolic substances, which is applied in the field of coal chemical industry, can solve the problems of complex operation process, strong corrosion of equipment, and limited industrial application prospects, etc., and achieve the effect of simple process, stable physical properties and mild conditions

Active Publication Date: 2018-05-08
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these quaternary ammonium salts are not soluble in oil, there are some problems that limit their industrial application prospects
First of all, the above-mentioned quaternary ammonium salts all contain Cl - And it is easy to absorb moisture and

Method used

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  • Method of using polyethylene imine to extract and separate phenolic substances from coal tar

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1

[0018] Mix PEI with an average molecular weight of 10,000 and coal tar (simulated oil mixed with phenol and toluene, in which the content of phenol is 15wt%) at a mass ratio of 0.2, make the two fully contact, and extract at 30°C for 60 minutes to make phenol As much of the substances as possible enter the extractant from the oil to obtain the extract phase and dephenolic oil. The ethyl ether of the stripping agent and the extraction phase are uniformly mixed according to a mass ratio of 0.4, and the stripping agent phase and the extraction agent phase are obtained by stripping at room temperature for 60 minutes. The stripping agent phase and the extracting agent phase were distilled at 50° C. and 0.01 MPa for about 1 hour to obtain phenolic substances, regenerated PEI and ether. After calculation, the recovery rate of phenols is 29.6%.

Example Embodiment

[0019] Example 2

[0020] PEI with an average molecular weight of 600 is mixed with coal tar (a simulated oil mixed with phenol, toluene and n-octane, in which the content of toluene is 50% by weight, and the content of phenol is 15% by weight) at a mass ratio of 0.5 to make the two fully contact ,Extract 60min at 30℃ to make as much phenols as possible from the oil into the extractant to obtain the extract phase and dephenol oil. The ethyl ether of the stripping agent and the extraction phase are uniformly mixed according to a mass ratio of 0.4, and the stripping agent phase and the extraction agent phase are obtained by stripping at room temperature for 60 minutes. The stripping agent phase and the extracting agent phase were distilled at 60°C and 0.01MPa for about 0.5h to obtain phenolic substances, regenerated PEI and ether. After calculation, the recovery rate of phenols is 36.5%.

Example Embodiment

[0021] Example 3

[0022] PEI with an average molecular weight of 600 and coal tar (a simulated oil mixed with phenol, toluene and n-octane, in which the content of toluene is 50% by weight, and the content of phenol is 15% by weight) are mixed in a mass ratio of 1:1 to make the two Full contact, extraction at 30°C for 120 minutes, so that as much phenols as possible from the oil into the extractant, to obtain the extract phase and dephenol oil. The ethyl ether of the stripping agent and the extraction phase are uniformly mixed according to the mass ratio of 0.4:1, and the stripping agent phase and the extraction agent phase are obtained by stripping at room temperature for 30 minutes. The stripping agent phase and the extracting agent phase were distilled at 60°C and 0.01MPa for about 0.5h to obtain phenolic substances, regenerated PEI and ether. After calculation, the recovery rate of phenols is 36.7%.

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Abstract

The invention relates to a method of using polyethylene imine to extract and separate phenolic substances from coal tar. The method comprises the steps that firstly, the polyethylene imine is used asan extractant, phenolic substances are extracted from the coal tar; then, low boiling point organic solvents such as ethyl ether, acetone, ethyl acetate and tetrahydrofuran are used as reverse extractants, phenolic substances are reversely extracted from the extraction solution obtained in the previous step; finally, the two liquid phases obtained from the reverse extraction are distilled, separation and recovery of the extractant and the reverse extractants are carried out, at the same time, the crude phenolic substances are obtained. The method is simple and convenient to operate, and wastewater containing phenol is not produced, the extractant is insoluble in the coal tar and does not pollute the coal tar, is non-corrosive to equipment, the phenolic substances can be separated and extracted efficiently, both the raw material extractant and the reverse extractants can be recycled, the manufacturing cost is greatly reduced, and the practical value is higher.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a method for extracting and separating phenolic substances in coal tar by using polyethyleneimine. Background technique [0002] Coal tar is the product of coal dry distillation process, in the form of dark brown viscous liquid, and the annual output in my country can reach more than 20 million tons. According to the different carbonization temperature and method, coal tar can be divided into low-temperature carbonization tar (450-650 ℃), low-temperature and medium-temperature generator tar (600-800 ℃), medium-temperature vertical furnace coal tar (900-1000 ℃) and high-temperature Coking tar (1000°C). In addition to hydrocarbons such as alkanes, olefins and aromatics, coal tar also contains phenolic compounds of high economic value, such as phenol, cresol, xylenol, etc. Generally speaking, low-temperature coal tar contains more phenolic substances, and its phenol...

Claims

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Application Information

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IPC IPC(8): C07C37/72C07C39/04C10C1/18
CPCC07C37/72C10C1/18C07C39/04
Inventor 姜兴茂朱爽高家俊戴亚芬熊春艳
Owner WUHAN INSTITUTE OF TECHNOLOGY
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