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Method for thermally extracting coal

An extraction and stripping agent technology, applied in solid solvent extraction, petroleum industry, coke oven, etc., can solve the problem that the high value is only 32.4%, and achieve the effect of high thermal extraction rate of coal, low production cost and good quality

Inactive Publication Date: 2012-06-27
HEBEI IRON & STEEL GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The solvents used in the existing coal solvothermal extraction technology are mostly pure solvents, mixed solvents or 1-methylnaphthalene and other relatively expensive solvents. Although the Coal Research Institute uses coal liquefaction derivative oil as coal Hot extraction solvent, but the highest recovery rate of solid hot extract is only 32.4%, and the used hot extraction solvent is not recovered and recycled

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] a. Crush the coal until the particle size is ≦200μm, and dry it at 100°C for 96 hours for later use.

[0026] b. Add 300g of the above-mentioned dried coal particles with a particle size of ≦200μm, and add 600ml of industrial-grade national standard washing oil according to the mass-to-volume ratio of coal particles and solvent.

[0027] c. Replace the air in the autoclave with nitrogen and fill it with nitrogen to 5MPa, keep the pressure in the kettle constant within 30min, then release the nitrogen, then fill it with nitrogen to 5MPa, and quickly heat up to 450°C and constant temperature for 4 hours to obtain the extract. After filtration, the filtrate and filter residue were obtained. After the filter residue was washed with the same solvent as the extraction, the washing liquid and the filtrate were combined, and the filter residue was used to analyze the ash content.

[0028] d, the combined solution obtained in step c, the combined solution and the stripping agent...

Embodiment 2

[0031] a. Crush the coal until the particle size is ≦200μm, and dry it at 150°C for 12 hours for later use.

[0032] b. Add 50g of the above-mentioned dry coal particles with a particle size of ≦200μm, according to the mass-to-volume ratio, coal particles and solvent 1:12, add 600ml of industrial-grade national standard washing oil, mix it thoroughly, and then add it to a 1L high-pressure reaction kettle.

[0033] c. Replace the air in the autoclave with nitrogen and fill it with nitrogen to 5 MPa, keep the pressure in the autoclave constant within 30 minutes, then release the nitrogen, then fill it with nitrogen to 0 MPa, and rapidly raise the temperature to 300°C and constant temperature for 0.5 hours to obtain the extract. After filtration, the filtrate and filter residue were obtained. After the filter residue was washed with an appropriate amount of the same solvent as the extraction, the washing liquid and the filtrate were combined, and the filter residue was used to ana...

Embodiment 3

[0037] a. Crush the coal until the particle size is ≦200μm, and dry it at 120°C for 48 hours for later use.

[0038] b. Add 100g of the above-mentioned dry coal particles with a particle size of ≦200μm, and add 700ml of industrial-grade national standard washing oil according to the mass-to-volume ratio of the coal particles to the solvent.

[0039] c. Replace the air in the high-pressure reactor with nitrogen and fill it with nitrogen to 5MPa, keep the pressure in the kettle constant within 30min, then release the nitrogen, then fill it with nitrogen to 1Mpa, and quickly heat up to 380°C and constant temperature for 1 hour to obtain the extract. After filtration, the filtrate and filter residue were obtained. After the filter residue was washed with an appropriate amount of the same solvent as the extraction, the washing liquid and the filtrate were combined, and the filter residue was used to analyze the ash content.

[0040] d, the combined solution obtained in step c, the ...

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Abstract

The invention relates to a method for thermally extracting coal, and the method comprises the following steps of: fully mixing crushed and dried coal granules with a solvent, and then adding the mixture into a high-pressure reaction kettle, raising the temperature to a specified temperature under a certain pressure after nitrogen metathesis; and thermally extracting, filtering, washing and drying to obtain black super-pure coal, wherein the solvent is industrial-grade national standard absorber oil or absorber oil produced by a coking plant. By utilizing the method, the coal thermal extraction rate can reach above 80%, the super-pure coal yield can reach above 70% and the super-pure coal ash content is less than 0.1%. The method has the advantages of high thermal extraction rate and good quality of the coal, and low production cost, as well as wide market application prospect because an extraction solvent can be recycled.

Description

technical field [0001] The invention relates to a method for thermally extracting coal, in particular to the application of an industrial-grade national standard solvent and a method for preparing ultra-pure coal by thermally extracting coal, belonging to the technical field of chemical industry. Background technique [0002] Solvent extraction of coal is one of the main contents of coal chemical research, and its research not only has important theoretical significance, but also has practical application value. As early as the beginning of the 20th century, people tried to separate the caking components from coking coal by solvent extraction. Subsequently, a large number of research work turned to clarify the structure of coal by studying solvent extracts, study coal from the molecular level, and reveal the molecular structure of organic matter in coal. For bituminous coal, a polar solvent can be used to obtain a high extraction yield at its boiling point, such as: Toshima...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/02C10B57/08
Inventor 张晓力崔咏梅赵风云胡永琪赵华李立业
Owner HEBEI IRON & STEEL GRP
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