Method for extracting thermolysis coal by coal tar

A technology of coal tar and low-temperature coal tar, which is applied in the field of coal tar extraction-pyrolysis coal, and coal extraction pyrolysis solvent, can solve the problems of liquid product yield to be improved, practical application, scale to be expanded, etc., to achieve utilization Extensive, low-cost solvent sources, and excellent properties

Active Publication Date: 2013-11-27
陕西煤化工技术工程中心有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still key technical problems that need to be overcome in the application and popularization of the low-temperature carbonization technology of coal at present: 1) The yield of liquid products needs to be improved; 2) The efficient utilization of solid product semi-coke; Processing etc.
[0011] Although the methods disclosed in the above two patents have simple technological processes, they all use relatively expensive pure solvents, which are costly and have problems such as solvent recovery, which cannot be practically applied.

Method used

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  • Method for extracting thermolysis coal by coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) Raw coal pretreatment

[0050] The Shenfu long-flame coal was crushed and sieved by a pulverizer, and the particle size of the coal sample was less than 75 μm. Dry in a vacuum oven at 100±5°C for 6 hours, keep in a vacuum state and cool to room temperature, take it out and store it in a desiccator for later use.

[0051] 2) Solvent preparation

[0052] Distill the low-temperature coal tar in the distillation kettle, firstly remove the moisture in the coal tar, and collect the light distillate oil at 100-300°C as a solvent for later use;

[0053] 3) Extraction

[0054] Weigh 75g of coal sample and 227g of solvent, mix the two raw materials into the extraction tank, and use microwave to heat the mixture from room temperature to 200°C under normal pressure, and extract at constant temperature for about 30min; Cool and immediately drain the extraction mixture.

[0055] 4) Pyrolysis process

[0056] The extracted mixed product was pyrolyzed on an aluminum retort with...

Embodiment 2

[0058]The coal sample is the same as in Example 1, and the solvent is middle distillate oil at 180-360°C. Weigh 45g of coal sample and 180g of solvent into an extraction tank. Under normal pressure, use microwaves to heat the mixture from room temperature to 200°C, and extract at a constant temperature for about 30 minutes. After the extraction is completed, pour the extraction mixture into a centrifuge tube while it is hot. Carry out centrifugation to above-mentioned extraction mixture in centrifuge, centrifuge speed is 3800rps, and centrifugation time is 15min; 550°C, residence time 20min. The conversion rate of pulverized coal is 29.4%. After pyrolysis, the coke is powdery, non-caking, dark gray and dull.

Embodiment 3

[0060] The coal sample is the same as in Example 1, and the solvent is middle distillate oil. Weigh 45g of coal sample and 136g of solvent into a round-bottomed flask, heat the mixture electrically, and when the temperature reaches 200°C, transfer the material into an extraction tank, and keep microwave radiation at this temperature for 20 minutes; tank, and pour the material into an aluminum retort for pyrolysis, with a pyrolysis temperature of 510°C and a residence time of 20 minutes. The conversion rate of pulverized coal is 38.8%. After pyrolysis, the coke is powdery, non-caking, dark gray and dull.

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Abstract

The invention discloses a coal tar extracting and coal pyrolyzing method. The method comprises the following steps of: firstly, pulverizing raw material coal, sieving and drying to obtain pulverized coal with granularity being less than 75 mum; then distilling low-temperature coal tar, collecting distillate as a solvent; mixing the solvent and the pulverized coal, heating and extracting; and finally, carrying out centrifugal separation and pyrolyzation to obtain low-temperature tar, coal gas and coke. According to the method, since the distillate of the low-temperature coal tar is used as the solvent, the price of the solvent can be lowered effectively, and the production cost can be lowered; moreover, the solvent can be recycled and reused, thus recycling and reusing the solvent can be realized.

Description

technical field [0001] The invention belongs to the technical field of coal extraction pyrolysis, and relates to a coal extraction pyrolysis solvent and a method, in particular to a coal tar extraction-pyrolysis coal method. Background technique [0002] my country is rich in coal resources. At present and for a long period of time in the future, the national conditions that coal is the main energy source in my country will not change. However, as a non-renewable resource, it is imperative to efficiently and cleanly transform and utilize it. [0003] At present, the technologies for producing clean liquid fuel from coal mainly include direct liquefaction of coal, indirect liquefaction of coal, low-temperature dry distillation of coal and solvent extraction of coal, etc. [0004] Coal low-temperature dry distillation technology has been well promoted and applied in the utilization of low-metamorphic coal due to its characteristics of small investment, water saving, energy sav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/00C10G1/04C10C1/14C10B53/04C10B57/00C10B57/08
Inventor 刘弓陈亚妮李建伟闵小建周安宁张军民侯翠利田文莉孙显锋
Owner 陕西煤化工技术工程中心有限公司
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