Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF2 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of using polyethylene imine to extract and separate phenolic substances from coal tar

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] PEI with an average molecular weight of 600 and coal tar (a simulated oil mixed with phenol, toluene and n-octane, wherein the content of toluene is 50wt% and the content of phenol is 15wt%) is mixed 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%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com