Method for preparing needle coke by medium and low temperature coal tar pitch composite extraction modification

A technology of low-temperature coal tar and needle coke, applied in the field of coal chemical industry, can solve the problems of high process energy consumption, affecting the quality and performance of needle coke, and difficulty in obtaining intermediate equivalence in structure, achieving high fiber content, stable structure, and improving supply The effect of hydrogen capacity

Active Publication Date: 2021-11-05
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the above-mentioned patents, although the middle and low temperature coal tar pitches are all processed and refined to prepare needle coke, the following problems still exist. It is difficult to obtain a mesophase with stable structure and wide-area streamlined shape, which affects the quality and quality of needle coke. high performance and high process energy consumption

Method used

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  • Method for preparing needle coke by medium and low temperature coal tar pitch composite extraction modification
  • Method for preparing needle coke by medium and low temperature coal tar pitch composite extraction modification
  • Method for preparing needle coke by medium and low temperature coal tar pitch composite extraction modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1) Put 2.6kg of the whole distillate medium-low temperature coal tar in a rectification kettle, distill under reduced pressure to obtain a distillate at 360-540°C, cool to room temperature and pulverize;

[0054] 2) Take 80g of asphalt and 120g of organic mixed solvent (60g of n-hexane, 60g of toluene) in a beaker, stir in a water bath at 60°C for 15min, let stand for 20min, and take the upper layer, which is the organic extract;

[0055] Put the organic extract and 200g [Bmim][Cl] ionic liquid in a beaker, stir it with a strong magnetic force for 10 minutes in a water bath at 40°C, cool it down to room temperature, and filter out the insoluble matter with a vacuum filter; add Deionized water 4 times the volume of the filtrate is used for back extraction, and the solid-liquid mixture after back extraction is filtered with a vacuum filtration device to separate the extract; the extract is distilled under reduced pressure to remove the organic solvent to obtain the extract...

Embodiment 2

[0061] 1) Put 2.6kg of the whole distillate medium-low temperature coal tar in a rectification kettle, distill under reduced pressure to obtain a distillate at 360-540°C, cool to room temperature and pulverize;

[0062] 2) Take 80g of asphalt and 160g of organic mixed solvent (60g of n-hexane, 100g of toluene) in a beaker, stir in a water bath at 70°C for 20min, let it stand for 20min, and take the upper layer, which is the organic extract;

[0063] Combine the organic extract with 340g [Bmim][PF 6 ] Place the ionic liquid in a beaker, stir it with a strong magnetic force for 15 minutes in a water bath at 50°C, cool it down to room temperature, filter the insolubles with a vacuum filter, add deionized water 5 times the volume of the filtrate to the filtrate for reaction Extraction, the solid-liquid mixture after back-extraction is suction-filtered with a vacuum filtration device, and the extract is obtained by separation. The extract is distilled off under reduced pressure to...

Embodiment 3

[0069] 1) Put 2.6kg of the whole distillate medium-low temperature coal tar in a rectification kettle, distill under reduced pressure to obtain a distillate at 360-540°C, cool to room temperature and pulverize;

[0070] 2) Take 80g of asphalt and 180g of organic mixed solvent (60g of n-hexane, 120g of toluene) in a beaker, stir in a water bath at 75°C for 20min, let it stand for 20min, and take the upper layer, which is the organic extract;

[0071] The organic extract was mixed with 440g ([Bmim]FeCl 4 , [Bmim][Cl]) ionic liquid in a beaker, in a water bath at 60 ° C, strong magnetic stirring for 20 minutes, cooled to room temperature, with a vacuum filter to filter out the insoluble matter; add 6 times the amount of filtrate to the filtrate volume of deionized water for back extraction, and the solid-liquid mixture after back extraction is filtered with a vacuum filtration device to separate the extract; the extract is distilled under reduced pressure to remove the organic so...

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Abstract

The invention belongs to the technical field of coal chemical industry, and relates to a method for preparing needle coke by medium and low temperature coal tar pitch composite extraction modification, the method comprises the following steps: 1) cutting pitch of a 360-540 DEG C fraction section from medium and low temperature coal tar full fraction; 2) sequentially adopting an organic mixed solvent extraction process, an ionic liquid extraction process and a component modification process to obtain refined asphalt from the cut asphalt; 3) carrying out thermal polymerization on the refined asphalt under a magnetic field condition to obtain semicoke; and 4) in a nitrogen atmosphere, calcining the semicoke, and cooling to obtain the needle coke. The content of N in the refined asphalt is less than 2%, the content of O is 3.5-4.2%, and the aromaticity fA is 0.7-0.9. Medium and low temperature coal tar pitch is taken as a raw material, the refined pitch is obtained by adopting a composite extraction modification process, effective directional regulation and control of the raw material are realized, the hydrogen supply capacity in the intermediate phase forming process is improved, the viscosity of the carbonization system is reduced, and the prepared product is stable in structure and high in fiber content.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and relates to a method for preparing needle coke through composite extraction and modification of medium and low temperature coal tar pitch. Background technique [0002] As an important new industrial material, needle coke has been widely used in the research of capacitors and lithium-ion batteries in recent years due to its high conductivity, low thermal expansion coefficient, corrosion resistance, and high strength. The main raw material of graphite electrode, the performance of graphite electrode is determined to a certain extent by the quality of needle coke, and the quality of needle coke is mainly affected by the composition of raw materials. [0003] Medium and low temperature coal tar pitch is characterized by rich aromatic compounds with low ring number and very small amount of quinoline insolubles (QI), and is a high-quality raw material for the production of coal-based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B55/00C10B57/04C10C1/18
CPCC10C1/18C10B55/00C10B57/045Y02P20/54
Inventor 李冬徐贤施俊合田佳勇崔楼伟刘杰田育成黄晔高生辉高峰
Owner NORTHWEST UNIV(CN)
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