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Method for preparing high-quality needle coke raw material by removing QI (Quinoline Insolubles) in coal tar

A needle coke raw material, coal tar technology, applied in the direction of only multi-stage serial refining process, etc., can solve the problems of complicated process, expensive price, low yield of solvent method, etc.

Inactive Publication Date: 2014-04-23
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The first three methods all have disadvantages such as complex process and low yield; while the solvent method generally has a low yield, or the price is too expensive because of the use of more pure solvents

Method used

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  • Method for preparing high-quality needle coke raw material by removing QI (Quinoline Insolubles) in coal tar
  • Method for preparing high-quality needle coke raw material by removing QI (Quinoline Insolubles) in coal tar
  • Method for preparing high-quality needle coke raw material by removing QI (Quinoline Insolubles) in coal tar

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Effect test

specific Embodiment approach

[0021] The method for removing coal tar QI of the present invention to prepare high-quality needle coke raw material, its preferred embodiment is:

[0022] Include steps:

[0023] First, add the aromatic hydrocarbon solvent and the aliphatic hydrocarbon solvent alone or the mixed solvent after mixing into the raw coal tar, after stirring and gravity sedimentation, the solution is divided into supernatant liquid and residue;

[0024] Afterwards, the supernatant is distilled to obtain refined coal tar with low QI content.

[0025] The aromatic hydrocarbon solvent includes wash oil, and the aliphatic hydrocarbon solvent includes kerosene.

[0026] The mass percentage of the washing oil in the mixed solvent is 1-99%.

[0027] The aromatic hydrocarbon solvent also includes phenanthrene.

[0028] The phenanthrene accounts for 0.1-8% by mass of the raw coal tar, and the mass ratio of the raw coal tar to the mixed solvent is 1:0.8-1:3.

[0029] The gravity settling process is carr...

Embodiment 1

[0039] The basic properties of the raw coal tar used in the experiment are shown in Table 1. Such as figure 1 As shown, take 100g of coal tar, 37.5g of washing oil and 62.5g of kerosene and preheat them in a constant temperature oil bath at 100°C. After sufficient preheating, put the three in the same beaker and mix evenly (also in a constant temperature oil bath at 100°C). After stirring for 30 min, the mixed solution was allowed to stand for 2 h. Take the upper layer in a three-necked flask, and keep the residue for later use. The experimental device such as figure 2 The link shown is fine. Heat the upper layer liquid, observe the liquid phase temperature and gas phase temperature, and ensure that the liquid phase temperature does not exceed 390°C. Finally, refined coal tar is obtained. The yield of refined coal tar was measured to be 66%, and the QI content was 0.24%.

Embodiment 2

[0041] The basic properties of the raw coal tar used in the experiment are shown in Table 1. Such as figure 1 As shown, take 100g of coal tar, 42.9g of washing oil and 107.1g of kerosene and preheat them in a constant temperature oil bath at 100°C. After sufficient preheating, put the three in the same beaker and mix evenly (also in a constant temperature oil bath at 100°C). After stirring for 30 min, the mixed solution was allowed to stand for 2 h. Take the upper layer in a three-necked flask, and keep the residue for later use. The experimental device such as figure 2 The link shown is fine. Heat the upper layer liquid, observe the liquid phase temperature and gas phase temperature, and ensure that the liquid phase temperature does not exceed 390°C. Finally, refined coal tar is obtained. The yield of refined coal tar was measured to be 58%, and the QI content was 0.04%.

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Abstract

The invention discloses a method for preparing a high-quality needle coke raw material by removing QI (Quinoline Insolubles) in coal tar, and the method comprises the following steps: firstly, separately adding an aromatic hydrocarbon solvent and an aliphatic hydrocarbon solvent into a raw material coal tar or adding a mixture of the aromatic hydrocarbon solvent and the aliphatic hydrocarbon solvent into the raw material coal tar, and carrying out mixing and gravity settling on the obtained mixture, so that an obtained solution is divided into an upper liquid and residues; then, distilling the upper liquid so as to obtain low-QI-content refined coal tar. The QI in coal tar can be removed, and then low-QI-content refined coal tar for preparing needle cokes is obtained; the method is mild in conditions, strong in maneuverability and low in cost.

Description

technical field [0001] The invention relates to a technology for preparing needle coke, in particular to a method for removing coal tar QI to prepare high-quality needle coke raw materials. Background technique [0002] Needle coke is a high-quality raw material vigorously developed in the 1970s. Its color is silver-gray, with metallic luster, and its appearance is streamlined with fibrous texture, hence the name. With a series of advantages such as low thermal expansion coefficient, high electrical conductivity, high density, low crystal expansion and low corrosion, it is the aggregate for manufacturing large-scale high power (High Power) and ultra high power (Ultra High Power) electrodes, and is used in ultra-high Power electric furnace steelmaking production. Compared with ordinary electrodes, it can shorten smelting time (1 / 3), reduce energy consumption (1 / 2), increase production capacity by about 1.3 times, and effectively reduce environmental pollution. Needle coke i...

Claims

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Application Information

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IPC IPC(8): C10G53/02
Inventor 王永刚许德平张书贺欣刘丹陈宇飞张若涛
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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