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Extracting and separating method of high-temperature coal tar

A high-temperature coal tar and separation method technology, which is applied in tar processing, tar processing through selective solvent extraction, petroleum industry, etc., can solve the problems of coal tar separation and utilization rate limitation, waste of energy, large investment, etc. And the effect of remarkable energy saving of equipment, low equipment investment and short payback period

Inactive Publication Date: 2012-06-13
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for extraction and separation of high-temperature coal tar to solve the problems of waste of energy, excessive investment, and limited separation and utilization of coal tar

Method used

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  • Extracting and separating method of high-temperature coal tar
  • Extracting and separating method of high-temperature coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: After fully stirring and heating at 50-60 degrees, the raw material of coal tar and the mixed solvent of petroleum ether and light oil of equal volume were mixed and extracted for 4 hours according to the volume ratio of 1:2. After the system reached equilibrium, the equal volume of petroleum ether and The mixed solvent of light oil and the light components of coal tar are in the upper layer, and the heavy pitch components in the raw coal tar are in the lower layer. The extract and raffinate are separated by filtration, and the extract is distilled to recover an equal volume of petroleum ether and light oil mixed solvent for recycling. The extract is rich in coal tar light components; the raffinate contains coal powder, coal tar heavy asphalt of QI insoluble matter of coke powder.

[0025] After fully stirring and heating at 80-90 degrees, the raffinate of the above-mentioned coal tar mixed solvent and the mixed solvent of equal volume carbon disulfide and ac...

Embodiment 2

[0026] Example 2: After fully stirring and heating at 70-80 degrees, the raw material of coal tar and the mixed solvent of 3 parts of n-hexane and 1 part of naphthalene oil were mixed and extracted for 2 hours according to the volume ratio of 1:4. After the system reached equilibrium, n-hexane and naphthalene oil The mixed solvent and the light components of coal tar are in the upper layer, and the heavy pitch components in the raw coal tar are in the lower layer. The extract and raffinate are separated by filtration, the extract is distilled and the mixed solvent of n-hexane and naphthalene oil is recovered and recycled. The extract is rich in coal tar light components; the raffinate contains coal powder, coal tar heavy asphalt of QI insoluble matter of coke powder.

[0027] After fully stirring and heating at 90-100 degrees, the raffinate of the above-mentioned coal tar mixed solvent and the mixed solvent of 3 parts of toluene and 1 part of tetrahydrofuran were mixed and ext...

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Abstract

An extracting and separating method of high-temperature coal tar belongs to a coal tar separation method. The extracting and separating method includes the step of adding No.1 or No.2 solvent into the coal tar at the ordinary pressure for secondary extraction and separation. Extraction processes are carried out under the pretreatment condition of sufficiently mixing and heating, heating temperature is lower than 150 DEG C, raw materials of the coal tar are respectively mixed with the No.1 or No.2 solvent according to the volume proportion of 1:2 to 4, extraction time ranges from 1 to four hours, extracts and raffinate are obtained after the No.1 solvent and the coal tar are filtered and separated when the system is balanced, and the No.1 solvent is recovered by distillation and recycled. The extracting and separating method has the advantages that energy saving effect of equipment is evident, process is simple and convenient, operation conditions are moderate, manufacturing cost and investment of the equipment are low and benefits are evident. Adding quantity of the solvent and extraction operation parameters are changed, separation depth and process capacity of the coal tar can be flexibly mastered and selectively controlled.

Description

technical field [0001] The invention relates to a method for separating coal tar, in particular to an extraction and separation method for high-temperature coal tar. Background technique [0002] High-temperature coal tar is a black or dark brown viscous liquid with a pungent odor. It is a liquid product obtained during the dry distillation and gasification of coal under the condition of isolated air. The main source is coking in iron and steel enterprises. by-products. [0003] At present, most of the domestic countries adopt the one-tower or two-tower tar distillation process introduced from the former Soviet Union. The separation of high temperature coal tar is realized by conventional distillation. Conventional coal tar distillation can be divided into intermittent tar distillation and continuous tar distillation according to the operation mode, and can be divided into atmospheric distillation and vacuum distillation according to whether there is vacuum or not. Ta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C1/18C10C1/00
Inventor 魏贤勇宗志敏冯超辉周建石王方武于玲丽陈博刘洁王玉高李鹏李保民赵炜樊星赵云鹏
Owner CHINA UNIV OF MINING & TECH
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