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A method for extracting phenolic compounds in medium and low temperature coal tar by using ionic liquid

A technology for phenolic compounds and low-temperature coal tar, applied in the preparation of organic compounds, chemical instruments and methods, and tar processing through selective solvent extraction, etc., can solve the problems of high processing cost, low purity, waste of resources, etc. The effect of low environmental pollution, simple operation and easy operation

Inactive Publication Date: 2018-09-25
YULIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the backwardness of separation and detection technology, there are few reports on the extraction of chemical substances in coal tar
At present, coal tar is mainly used as liquid fuel base oil after hydrogenation, which causes a great waste of resources
At present, alkaline washing, superheated water extraction and salt solution extraction are mainly used to extract phenolic compounds in coal tar. Although they have a certain extraction effect, there are still problems such as low extraction rate, large environmental pollution, Problems such as high post-processing cost and low purity seriously restrict the development of coal tar to clean and high value-added chemicals

Method used

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  • A method for extracting phenolic compounds in medium and low temperature coal tar by using ionic liquid

Examples

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Effect test

Embodiment 1

[0021] Example 1 A method for extracting phenolic compounds in medium and low temperature coal tar by using ionic liquid, the specific steps are:

[0022] (1) Measure 25 parts of medium and low temperature coal tar into the reaction kettle, then add 7 parts of monoethanolamine formic acid ionic liquid, heat in a water bath at 30°C, and stir for 30 minutes;

[0023] (2) The mixed solution obtained in step (1) (the mixed solution of medium-low temperature coal tar and monoethanolamine formic acid ionic liquid) was left to stand for 30 minutes to separate the two phases, separate the two phases, and transfer the lower layer to another container , add 15 parts of diethyl ether to the container, stir at 25°C for 30 minutes, then let it stand until the mixture is completely separated, and the obtained lower layer liquid is a mixture of diethyl ether and phenolic compounds;

[0024] (3) Distill the ether in the mixture of ether and phenolic compounds at 45°C to obtain phenolic compou...

Embodiment 2

[0026] Example 2 A method for extracting phenolic compounds in medium and low temperature coal tar by using ionic liquid, the specific steps are:

[0027] (1) Measure 28 parts of medium and low temperature coal tar into the reaction kettle, then add 9 parts of monoethanolamine formic acid ionic liquid, heat in a water bath at 34°C, and stir for 30 minutes;

[0028] (2) The mixed solution obtained in step (1) (the mixed solution of medium-low temperature coal tar and monoethanolamine formic acid ionic liquid) was left to stand for 30 minutes to separate the two phases, separate the two phases, and transfer the lower layer to another container , add 18 parts of diethyl ether to the container, stir at 25°C for 30 minutes, then let it stand until the mixture is completely separated, and the obtained lower layer liquid is a mixture of diethyl ether and phenolic compounds;

[0029] (3) Distill the ether in the mixture of ether and phenolic compounds at 45°C to obtain phenolic compou...

Embodiment 3

[0031] Example 3 A method for extracting phenolic compounds in medium and low temperature coal tar by using ionic liquid, the specific steps are:

[0032] (1) Measure 21 parts of medium and low temperature coal tar into the reaction kettle, then add 5 parts of monoethanolamine formic acid ionic liquid, heat in a water bath at 27°C, and stir for 30 minutes;

[0033] (2) The mixed solution obtained in step (1) (the mixed solution of medium-low temperature coal tar and monoethanolamine formic acid ionic liquid) was left to stand for 30 minutes to separate the two phases, separate the two phases, and transfer the lower layer to another container , add 11 parts of diethyl ether to the container, stir at 25°C for 30 minutes, then let it stand until the mixture is completely separated, and the obtained lower layer liquid is a mixture of diethyl ether and phenolic compounds;

[0034] (3) Distill the ether in the mixture of ether and phenolic compounds at 45°C to obtain phenolic compou...

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Abstract

The invention relates to a method for extracting phenolic compounds in low-temperature coal tar by using ionic liquid. The method for extracting the phenolic compounds in the low-temperature coal tar by using the ionic liquid specifically comprises the following steps: (1) adding monoethanolamine formic acid ionic liquid in the low-temperature coal tar, and performing reaction to obtain mixed solution; (2) standing the mixed solution to enable two phases to be layered, transferring the subnatant into another container, adding ethyl ether into the container and standing for layering, wherein the subnatant is mixture of the ethyl ether and the phenolic compounds; (3) distilling out the ethyl ether to obtain the phenolic compounds. The method for extracting the phenolic compounds in the low-temperature coal tar by using the ionic liquid is simple and easy to operate, the environmental pollution is small and the phenol extraction rate highly reaches 98 percent.

Description

technical field [0001] The invention discloses a method for extracting phenolic compounds in medium-low temperature coal tar by using ionic liquid, which belongs to the field of coal tar recovery and utilization. Background technique [0002] Coal tar is a liquid product recovered from the waste gas produced during the high-temperature coking process. The heat required for coal pyrolysis in the coke oven chamber is provided by the furnace walls parallel to both sides of the carbonization chamber. The coal material loaded into the carbonization chamber first precipitates the water, carbon dioxide and methane adsorbed in the coal. As the temperature of coal material increases, the molecular structure of coal containing more oxygen is decomposed into water and carbon dioxide. When the temperature of the coal seam reaches 300-500°C, the side chains and groups of the coal macromolecules are broken, and the resulting product is the primary pyrolysis product, that is, primary coa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10C1/18C07C37/72
CPCC07C37/72C10C1/18C07C39/00
Inventor 高平强乔再立张岩卢翠英马文山
Owner YULIN UNIV
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