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Electrode pitch and preparation method thereof

A pitch and electrode technology, applied in the field of electrode pitch and its preparation, can solve the problems of high softening point of pitch and cannot meet the requirements, etc., and achieve the effects of high coking value, low QI content, and reduced interfacial tension

Active Publication Date: 2014-09-10
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the softening point of direct coal liquefaction bitumen is relatively high, which cannot meet the requirements of bitumen for impregnating agent and bitumen for binder

Method used

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  • Electrode pitch and preparation method thereof
  • Electrode pitch and preparation method thereof
  • Electrode pitch and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0028] The method for preparing electrode pitch of the present invention comprises:

[0029] (1) Extract the coal direct liquefaction residue with an organic solvent to obtain extracted pitch, wherein the organic solvent is a mixture of one or more of the following compounds: alicyclic hydrocarbons, aromatic hydrocarbons, chlorinated aromatic compounds, chlorine Aliphatic hydrocarbons, alcohols, aldehydes, ketones, sulfones, sulfoxides, ethers, carbon disulfide, pyridine, amides, petroleum distillates and liquefied oils produced during the direct liquefaction of coal; and

[0030] (2) Treat the extracted pitch at 350-420°C in an inert atmosphere to obtain electrode pitch.

[0031] Each step is detailed below.

[0032] step 1)

[0033] In the step (1) of the method of the present invention, the coal direct liquefaction residue is extracted with an organic solvent, and the obtained extract is removed from the solvent to obtain the extracted pitch. The organic solvent can be ...

Embodiment 1

[0061] (1) First, the above-mentioned coal direct liquefaction residue and the IBP-110°C liquefied oil produced during the coal direct liquefaction process were subjected to primary extraction at a volume ratio of 1:3 for 50 minutes; the mixture obtained by the primary extraction was separated into solid and liquid , the obtained solid part and the 220-260 °C liquefied oil produced during the direct coal liquefaction process were subjected to secondary extraction for 60 minutes at a volume of 1:3, and the soluble part obtained from the two-stage extraction was recovered to obtain the extracted pitch.

[0062] (2) Put the extracted pitch and coal tar in a ratio of 1:0.8 into a closed autoclave, raise the temperature to 380°C at a rate of 2°C / min under a nitrogen atmosphere, and keep the temperature for 8 hours to obtain electrode pitch.

[0063] The indexes of the extraction pitch, coal tar, and electrode pitch in Example 1 are shown in Table 1 below.

[0064] Table 1 Character...

Embodiment 2

[0068] (1) Obtain the extracted pitch through the step (1) in Example 1.

[0069] (2) Put the extracted pitch and coal tar in a ratio of 1:0.8 into a closed autoclave, and raise the temperature to 400°C at a rate of 3°C / min under a nitrogen atmosphere and keep the temperature constant for 6 hours to obtain electrode pitch.

[0070] The indicators of the obtained electrode pitch are shown in Table 2 below.

[0071] Table 2 Properties of electrode pitch

[0072]

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Abstract

The invention provides a method for preparing an electrode pitch by using direct coal liquefaction residues as a raw material. The method comprises the following steps: 1, extracting the direct coal liquefaction residues by using an organic solvent to obtain extracted pitch; and 2, processing the extracted pitch in inert atmosphere at 350-420DEG C to obtain the electrode pitch. The softening point of the electrode pitch is 90-120DEG C, the QI content of the electrode pitch is lower than 0.2%, and the coking value of the electrode pitch is greater than 50%. The invention provides the cheap electrode pitch prepared by using the cheap direct coal liquefaction residues as a raw material, and the preparation method thereof.

Description

technical field [0001] The invention relates to an electrode pitch and a preparation method thereof, more specifically, to a method for preparing electrode pitch by using coal direct liquefaction residue as a raw material and the electrode pitch obtained therefrom. Background technique [0002] Coal direct liquefaction residue is a by-product other than oil produced by hydrogenation in the process of direct coal liquefaction. Although the composition of the residue varies depending on the liquefaction method, it is generally divided into organic matter and inorganic matter. Organic matter is generally condensed aromatic structural units and partially hydrogenated hydrogenated aromatic structures, and contains a series of normal alkanes in the form of side chains of aromatic structural units. Inorganic substances are generally inorganic substances in unreacted coal and catalysts for direct coal liquefaction. The coal direct liquefaction residue is the coal direct liquefacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C1/18C10C1/19
Inventor 盛英赖世耀宫晓颐梁文斌张胜振张大伟王梦瑶
Owner CHNA ENERGY INVESTMENT CORP LTD
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