Method for preparing mesophase pitch by extracting coal direct liquefaction residue with supercritical solvent

A technology of direct coal liquefaction and mesophase pitch, which is applied in the field of coal deep processing, can solve the problems of unreachable utilization, etc., and achieve the effects of high aromatic carbon rate, improved economic benefits, and low content of quinoline insolubles

Active Publication Date: 2017-03-15
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the three traditional utilization methods of liquefaction residues cannot achieve the most effective utilization.

Method used

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  • Method for preparing mesophase pitch by extracting coal direct liquefaction residue with supercritical solvent
  • Method for preparing mesophase pitch by extracting coal direct liquefaction residue with supercritical solvent
  • Method for preparing mesophase pitch by extracting coal direct liquefaction residue with supercritical solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] a) Put 30g of coal direct liquefaction residue into the high-pressure extraction device, and heat the system to 290°C; b) Continuously inject benzene preheated to 290°C into the extraction kettle to raise the internal pressure of the extraction device to 8.7MPa; c) Adjust The electric control valve at the outlet of the extraction device keeps the system pressure stable at 8.7 MPa, and keeps the temperature and pressure state for continuous extraction. The extraction time is 2 hours. During the extraction process, if figure 1 As shown, Ta and Tb are composed of cascade control to ensure that the temperature Ta deviation in the kettle during the extraction process is less than 2°C; the temperature control deviations of T1, T2, and T3 sections are all within ±1°C; the pressure deviation during the entire extraction process is less than 0.1 MPa; d) Put the extracted product in a vacuum drying oven to further remove the residual solvent to obtain mesophase pitch. After testin...

Embodiment 2

[0040] The preparation process of this example is the same as that of Example 1, except that acetone is used as the extraction solvent instead of benzene, and the extraction temperature is changed to 235°C. After testing, in the mesophase pitch obtained by supercritical acetone extraction, the ash content is 0.05%, and the sulfur content is 0.37%. The quinoline-insoluble content is 7.47%, and the content of quinoline insolubles is 0.27%. After calculation, the yield of mesophase pitch obtained by supercritical acetone extraction is 45.85%.

Embodiment 3

[0042] The preparation process of this example is the same as that of Example 1, except that the extraction solvent is benzene is replaced by isopropanol, and the extraction temperature is 235°C. After testing, in the mesophase pitch obtained by supercritical isopropanol extraction, the ash content is 0.06%, and the sulfur content is 0.19%. The content of tetrahydrofuran insolubles is 4.27%, and the content of quinoline insolubles is 0.64%. After calculation, the yield of mesophase pitch obtained by supercritical isopropanol extraction is 47.12%.

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Abstract

The invention discloses a method of preparing mesophase pitch by extracting direct coal liquefaction residues through a supercritical solvent. The method comprises the steps of placing the direct coal liquefaction residues into a high-pressure extraction device, and integrally heating and warming the device; then, injecting a solvent preheated by a solvent preheating furnace into the high-pressure extraction device continuously so as to enable a solution with an extraction product to enter a solvent separating tank to complete the separation between the extraction product and the solvent, wherein the extraction product is enriched in the solvent separating tank in a solid state, i.e. carrying out supercritical extraction on the direct coal liquefaction residues to obtain the mesophase pitch; placing the mesophase pitch into a high pressure kettle, carrying out nitrogen purging after the sealing, and then keeping constant temperature after the heating process, and carbonizing to obtain an inter-phase of a wide-area streamline structure used as a needle coke precursor. When a product with high additional value can be produced by the direct coal liquefaction residues, the economic benefit of a coal liquefaction process and the use ratio of coals can be improved.

Description

technical field [0001] The invention relates to a coal deep processing technology, in particular to a method for preparing mesophase pitch by extracting coal direct liquefaction residue with a supercritical solvent. Background technique [0002] Coal direct liquefaction residue is a high-carbon, high-ash, high-sulfur substance, and its output accounts for more than 40% of the raw coal. The organic substances in the coal direct liquefaction residue include heavy liquefied oil, bituminous substances and unconverted coal; the inorganic substances include minerals in coal and external catalysts. [0003] The utilization of coal liquefaction residue is mainly traditional methods such as combustion, coking to oil, and gasification to hydrogen. The hydrogen-carbon ratio of the liquefaction residue is relatively high, and direct combustion of it as fuel will undoubtedly affect the economics of coal liquefaction; the sulfur content in the residue produced by the liquefaction process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10C3/08
CPCC10C3/08
Inventor 林雄超王永刚姜广策郭丰华
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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