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Method for extracting and separating phenolic substances in coal tar by using polyethyleneimine

A technology for polyethyleneimine and phenolic substances, applied in the field of coal chemical industry, can solve the problems of limited industrial application prospects, strong corrosiveness of equipment, complicated operation process, etc., and achieve the effects of stable physical properties, simple process and mild conditions

Active Publication Date: 2021-02-12
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 is highly corrosive to equipment; secondly, the above-mentioned quaternary ammonium salts are solid, but the mixture with phenolic substances (such as phenol) is liquid, and the change of physical properties makes the operation process more complicated

Method used

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  • Method for extracting and separating phenolic substances in coal tar by using polyethyleneimine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix PEI with an average molecular weight of 10,000 and coal tar (a simulated oil mixed with phenol and toluene, wherein the content of phenol is 15wt%) according to a mass ratio of 0.2, so that the two are fully contacted, and extracted at 30 ° C for 60 minutes, so that the phenol As many substances as possible enter the extractant from the oil to obtain the extract phase and dephenolized oil. The stripping agent diethyl ether and the extracting phase were uniformly mixed at a mass ratio of 0.4, and stripping was carried out for 60 min at normal temperature to obtain the stripping agent phase and the extracting agent phase. The back-extractant phase and the extractant phase were distilled at 50°C and 0.01MPa for about 1 hour to obtain phenolic substances, regenerated PEI and ether. After calculation, the recovery rate of phenolic substances was 29.6%.

Embodiment 2

[0020] Mix PEI with an average molecular weight of 600 and coal tar (the simulated oil mixed with phenol, toluene and n-octane, wherein the content of toluene is 50wt% and the content of phenol is 15wt%) according to the mass ratio of 0.5, so that the two are fully contacted , extracted at 30°C for 60 min, so that as much phenolic substances as possible entered the extractant from the oil to obtain the extract phase and dephenolized oil. The stripping agent diethyl ether and the extracting phase were uniformly mixed at a mass ratio of 0.4, and stripping was carried out for 60 min at normal temperature to obtain the stripping agent phase and the extracting agent phase. The back-extractant phase and the extractant 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 phenolic substances was 36.5%.

Embodiment 3

[0022] PEI with an average molecular weight of 600 is mixed with coal tar (the simulated oil formed by mixing phenol, toluene and n-octane, wherein the content of toluene is 50wt% and the content of phenol is 15wt%) according to the mass ratio of 1:1. Fully contact and extract at 30°C for 120 minutes, so that as much phenolic substances as possible enter the extractant from the oil to obtain the extract phase and dephenolized oil. The stripping agent diethyl ether and the extracting phase were uniformly mixed according to a mass ratio of 0.4:1, and stripping was carried out at room temperature for 30 minutes to obtain the stripping agent phase and the extracting agent phase. The back-extractant phase and the extractant 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 phenolic substances was 36.7%.

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Abstract

The invention relates to a method for extracting and separating phenolic substances in coal tar by using polyethyleneimine. The method first uses polyethyleneimine as an extractant to extract phenolic substances from coal tar, and then extracts phenolic substances from coal tar with ether, acetone, ethyl acetate Low-boiling organic solvents such as esters and tetrahydrofuran are used as stripping agents to strip phenolic substances from the extract obtained in the previous step, and finally the two liquid phases obtained by stripping are distilled, and the extraction agent and stripping agent are separated and recovered. Crude substances. The method of the invention is easy to operate and does not produce phenol-containing wastewater. The extractant is insoluble in coal tar without polluting it, has no corrosion to equipment, and can efficiently separate and extract phenolic substances. The raw material extractant and stripping agent used are both Renewable, greatly reduces production costs, and has high practical value.

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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Patent Type & Authority Patents(China)
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