Preparation method of polycondensed asphalt, preparation method of needle coke and needle coke

A technology of needle coke and pitch, which is applied in the field of needle coke, can solve the problem of single source of needle coke raw materials, and achieve the effects of improving overall economic benefits, high carbon content, and easy polymerization or crosslinking

Active Publication Date: 2014-03-05
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a method for preparing polycondensed pitch, a method for preparing needle coke and needle coke, so as to solve the problem of single source of raw materials for preparing needle coke in the prior art

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  • Preparation method of polycondensed asphalt, preparation method of needle coke and needle coke
  • Preparation method of polycondensed asphalt, preparation method of needle coke and needle coke
  • Preparation method of polycondensed asphalt, preparation method of needle coke and needle coke

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preparation example Construction

[0031] In order to solve the problem of single source of raw materials and high CTE for the preparation of needle coke mentioned in the background art, in a typical implementation of the present invention, a preparation method of polycondensation pitch is provided. The preparation method uses coal The liquefaction residue is used as the raw material. By adjusting the extraction solvent, the quinoline insolubles are separated, and the polycyclic condensed aromatics are retained to obtain the pitch raw material suitable for the synthesis of needle coke. The preparation method includes: step S1, using an extraction solvent to extract the pitch in the coal liquefaction residue to obtain refined pitch, the extraction solvent being selected from coal liquefied oil, N-methylpyrrolidone, tetrahydrofuran, quinoline, One or more of the group consisting of pyridine and anthracene oil; Step S2, making the powdery asphalt undergo polycondensation reaction to form polycondensed asphalt.

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Embodiment 1

[0056] Put ≤5mm coal liquefaction residue and pyridine into the stirring tank 3 according to the mass ratio of 1:1. After stirring evenly, extract under nitrogen pressure of 0.1MPa, temperature of 150°C, and stirring speed of 200r / min for 1 hour, and then extract The conveying pump is sent into the first-stage filter kettle, and under the protection of nitrogen, the mixed liquid is thermally filtered at a filtration temperature of 150°C and a pressure of 0.5MPa. The filtration accuracy of the filter material in the first-stage filter kettle is 50 microns; The extraction mixture is sent to the secondary filter tank by the primary filtrate delivery pump. Under the protection of nitrogen, the filtration temperature is 200 ° C and the pressure is 1 MPa. The mixed liquid is thermally filtered, and the filtration accuracy of the filter material in the secondary filter tank is 1 micron. ; Send the extraction mixed liquid into the vacuum distillation kettle by the secondary filtrate de...

Embodiment 2

[0059] Put ≤5mm coal liquefaction residue and anthracene oil into the stirring tank according to the mass ratio of 1:3. After stirring evenly, extract under nitrogen pressure of 1MPa, temperature of 200°C and stirring speed of 100r / min for 0.5 hours, and then transport through extraction Pump it into the first-stage filter kettle, and under the protection of nitrogen, heat-filter the mixed solution at a filtration temperature of 200°C and a pressure of 1MPa. The filtration accuracy of the filter material in the first-stage filter kettle is 30 microns; The liquid is sent to the secondary filter kettle by the primary filtrate delivery pump. Under the protection of nitrogen, the filtration temperature is 200°C and the pressure is 2MPa to thermally filter the mixed solution. The filtration accuracy of the filter material in the secondary filter kettle is 5 microns; The extraction mixture is sent to the vacuum distillation kettle by the secondary filtrate delivery pump, and the wash...

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Abstract

The invention provides a preparation method of polycondensed asphalt, a preparation method of needle coke and a needle coke. The preparation method of polycondensed asphalt comprises the following steps: S1. extracting asphalt in coal liquefication residues with an extraction solvent to obtain refined asphalt, wherein the extraction solvent is composed of one or more of 120-300 DEG C distillate segment coal liquefied oil, N-methylpyrrolidone, tetrahydrofuran, quinoline, pyridine and anthracene oil; and S2. carrying out polycondensation reaction on the refined asphalt to form the polycondensed asphalt. The refined asphalt is separated from the coal liquefication residues in an extraction mode, and such process can adopt the currently common extraction technique having high operability; the obtained refined asphalt is mainly composed of polycyclic condensed aromatics, has the characteristics of high aromaticity, high carbon content and high polymerization or crosslinking tendency, and is suitable to be used as a precursor of a polycondensed asphalt raw material for preparing needle coke; and the invention finds out a new application direction for coal liquefication residues.

Description

technical field [0001] The invention relates to the production field of needle coke, in particular to a preparation method of polycondensation pitch, a preparation method of needle coke and needle coke. Background technique [0002] Needle coke is an important raw material in the carbon industry, which has the advantages of low thermal expansion coefficient and good graphitization performance. After crushing, the shape is needle-like, and it has obvious fibrous structure and high anisotropy under the microscope. In the defense industry and civilian industry, it has its special purpose and significance. In particular, the ultra-high-power electrode steelmaking made of needle coke can improve steelmaking efficiency, reduce power consumption, and reduce steelmaking costs. It can be used as a high-energy neutron deceleration material in atomic reactors, and can also be used in rocket technology. It has significant economic and social benefits. The current needle coke is gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B55/00C10C3/00
Inventor 常鸿雁李克健章序文张元新程时富
Owner CHNA ENERGY INVESTMENT CORP LTD
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