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Method for separating phenolic substances in medium-low temperature coal tar

A technology of low-temperature coal tar and phenolic substances, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as unfavorable environmental protection, complexity, and large amount of wastewater

Active Publication Date: 2020-10-30
CHAMBROAD CHEM IND RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, medium and low temperature coal tar contains a large amount of phenols, and the separation of phenols and non-phenols is mostly carried out through auxiliary methods such as alkali washing, pickling neutralization, etc. The operating procedures are many and complicated, and the product recovery rate is low. Moreover, the amount of wastewater in the process is large, and the cost of subsequent sewage treatment is high, which is not conducive to environmental protection
[0003] Medium and low temperature coal tar is currently used to produce gasoline. Medium and low temperature coal tar contains more phenolic products, and the added value of phenols is higher. Separation, the separation of phenols and non-phenols is mostly carried out by auxiliary methods such as alkali washing, pickling neutralization, etc. The operation procedures are many and complicated, the product recycling rate is low, and the amount of wastewater in the process is large

Method used

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  • Method for separating phenolic substances in medium-low temperature coal tar

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Comparison scheme
Effect test

Embodiment 1

[0031] A method for separating phenolic substances in medium and low temperature coal tar. The medium and low temperature coal tar adopts two extraction and separation processes to separate phenolic substances with a purity greater than 99%. The specific steps are as follows:

[0032] (1) Medium and low temperature coal tar and mixed extractants A and B are uniformly mixed in a certain proportion, and after sedimentation and stratification, the upper layer is non-phenolic substance 1, and the lower layer is phenol-rich solvent;

[0033] (2) The separated phenol-rich solvent enters the extraction tower from the upper end of the tower, and the extractant C enters the extraction tower from the lower end of the tower, and undergoes countercurrent extraction;

[0034] (3) The top component of the extraction tower enters the recovery tower 1, and the top component of the recovery tower 1 is an extractant C, which is recycled, and the bottom component of the tower is a non-phenolic su...

Embodiment 2

[0042] A method for phenolic substances in medium and low temperature coal tar. The medium and low temperature coal tar adopts two extraction and separation processes to separate phenolic substances with a purity greater than 99%. The specific steps are as follows:

[0043] (1) Medium and low temperature coal tar and mixed extractants A and B are uniformly mixed in a certain proportion, and after sedimentation and stratification, the upper layer is non-phenolic substance 1, and the lower layer is phenol-rich solvent;

[0044] (2) The separated phenol-rich solvent enters the extraction tower from the upper end of the tower, and the extractant C enters the extraction tower from the lower end of the tower, and undergoes countercurrent extraction;

[0045] (3) The top component of the extraction tower enters the recovery tower 1, and the top of the recovery tower 1 is the extractant C, which is recycled, and the bottom of the tower is the non-phenolic substance 2;

[0046] (4) The...

Embodiment 3

[0053] A method for separating phenolic substances in medium and low temperature coal tar. The medium and low temperature coal tar adopts two extraction and separation processes to separate phenolic substances with a purity greater than 99%. The specific steps are as follows:

[0054] (1) Medium and low temperature coal tar and mixed extractants A and B are uniformly mixed in a certain proportion, and after sedimentation and stratification, the upper layer is non-phenolic substance 1, and the lower layer is phenol-rich solvent;

[0055] (2) The separated phenol-rich solvent enters the extraction tower from the upper end of the tower, and the extractant C enters the extraction tower from the lower end of the tower, and undergoes countercurrent extraction;

[0056] (3) The top component of the extraction tower enters the recovery tower 1, and the top of the recovery tower 1 is the extractant C, which is recycled, and the bottom of the tower is the non-phenolic substance 2;

[00...

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Abstract

The invention belongs to the field of separation and purification technologies in the chemical industry and particularly relates to a method for separating phenolic substances from medium and low temperature coal tar. A two-step extraction separation process is adopted, and phenolic substances with the purity being greater than 99% are separated. The method comprises the following specific steps of: mixing medium and low temperature coal tar with a mixed extraction agent, settling to obtain a phenol-rich component, enabling the phenol-rich component to enter an extraction tower, enabling heavycomponents at the tower bottom to enter a recovery tower 2, enabling a tower top component of the recovery tower 2 to enter a recovery tower 3, and enabling a tower bottom component of the recovery tower 3 to be the phenol substances. The separation process provided by the invention has the advantages of simple operation conditions, low extraction agent price, stable properties, low equipment investment and energy consumption, high phenol recovery rate, recyclable extraction agent and no generation of three wastes.

Description

technical field [0001] The invention belongs to the technical field of separation and purification in the chemical industry, and in particular relates to a method for separating phenolic substances in medium-low temperature coal tar. Background technique [0002] At present, medium and low temperature coal tar contains a large amount of phenols, and the separation of phenols and non-phenols is mostly carried out through auxiliary methods such as alkali washing, pickling neutralization, etc. The operating procedures are many and complicated, and the product recovery rate is low. Moreover, the amount of wastewater in the process is large, and the cost of subsequent sewage treatment is high, which is not conducive to environmental protection. [0003] Medium and low temperature coal tar is currently used to produce gasoline. Medium and low temperature coal tar contains more phenolic products, and the added value of phenols is higher. Separation, the separation of phenols and n...

Claims

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Application Information

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IPC IPC(8): C07C37/72C07C39/07C07C39/04C07C39/06
CPCC07C37/72C07C39/07C07C39/04C07C39/06Y02P20/10
Inventor 闫燕房峰苏鹏飞张强王启超曹峰吴文雷陈立江
Owner CHAMBROAD CHEM IND RES INST CO LTD
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