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Preparation method of high-purity coal tar pitch from industrial coal tar pitch

A coal pitch, high-purity technology, applied in the processing of tar pitch/petroleum pitch/natural pitch, processing tar pitch/petroleum pitch/natural pitch by distillation, and processing tar pitch/petroleum pitch/natural pitch by selective extraction, etc. It can solve the problems that the requirements of high-purity graphite raw materials cannot be met, the requirements of high-purity graphite raw materials cannot be met, and chemical impurities have not been removed, and the effect of high recovery rate, short process and lower production costs can be achieved.

Active Publication Date: 2011-10-26
KUNMING METALLURGY INST
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AI Technical Summary

Problems solved by technology

[0002] Coal tar pitch for industrial use, in which the carbon content of the main component is <85%, and the main impurities such as zinc, aluminum, titanium, and iron are high in content, which cannot meet the raw material requirements for the preparation of high-purity graphite
At present, industrial coal tar pitch is directly applied to industry without purification and impurity removal measures, or for relatively demanding processes, only simple physical removal of mechanical impurities is performed on coal tar pitch, and the chemical impurities are basically not obtained. removal, the raw material requirements for the preparation of high-purity graphite cannot be met

Method used

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  • Preparation method of high-purity coal tar pitch from industrial coal tar pitch
  • Preparation method of high-purity coal tar pitch from industrial coal tar pitch

Examples

Experimental program
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Effect test

Embodiment 1

[0007] Example 1. The content of Zn in industrial coal tar pitch is 4.2%, the content of Al is 1.25%, the content of Ti is 0.95%, the content of Fe is 1.35%, and the total ash content is 6.10%. The coal tar pitch is crushed at low temperature, wet-milled, and liquid-solid separated to obtain a material with a particle size of <100um.

[0008] Mix the obtained coal tar pitch with a particle size of <100um and 50% carbon tetrachloride into a reactor with a volume of 3 liters, and react for 8 hours at a temperature of 20-25°C. This is the first stage of slurry mixing. Dissolution. After the reaction time is up, liquid-solid separation is carried out to obtain the dissolved solid-phase coal tar pitch and the organic liquid phase solution containing coal tar pitch molecules. The obtained organic liquid phase solution is charged into a distiller to enter the first stage of distillation process. Heating up to 80-85°C and reaction pressure <0.2Mpa for 5 hours of reaction time, no ca...

Embodiment 2

[0011] Example 2. The content of Zn in industrial coal tar pitch is 3.2%, the content of Al is 1.45%, the content of Ti is 0.75%, the content of Fe is 1.63%, and the total ash content is 6.50%. The coal tar pitch is first subjected to low-temperature crushing, wet grinding, and liquid-solid separation to obtain a raw material with a particle size of <100um.

[0012] Mix the obtained coal tar pitch with a particle size of <100um and 60% carbon tetrachloride together, this is the first stage of slurry mixing and dissolution: add it to a reactor with a volume of 3 liters, and react for 7 hours at a temperature of 30-35°C , after the reaction time is up, liquid-solid separation is carried out to obtain the dissolved solid phase coal tar pitch and the organic liquid phase solution containing coal tar pitch molecules, and the obtained organic liquid phase is loaded into a distiller to enter the first stage of distillation process. Raise the temperature and heat, the temperature is 9...

Embodiment 3

[0015] Example 3. The content of Zn in industrial coal tar pitch is 2.8%, the content of Al is 1.04%, the content of Ti is 0.75%, the content of Fe is 1.65%, and the total ash content is 6.10%. The coal tar pitch is first crushed at low temperature, wet-milled, and liquid-solid separated to obtain a material with a particle size of <100um.

[0016] The obtained coal tar pitch preparation with a particle size of <100um is slurried together with 70% carbon tetrachloride, and added to a reactor with a volume of 3 liters. The temperature is 40-45°C, and the reaction is carried out for 5 hours. After the reaction time is up, the liquid-solid separation is carried out to obtain the leached solid phase coal tar pitch and the organic liquid phase solution containing coal tar pitch molecules. The obtained organic liquid phase is loaded into a distiller and enters the first stage of distillation process. Raise the temperature and heat, the temperature is 100-105°C, and the reaction tim...

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Abstract

The invention relates to a preparation method of high-purity coal tar pitch from industrial coal tar pitch. Industrial coal tar pitch is cracked at a low temperature of 0-15 DEG C, ground wet and treated with liquid-solid separation to obtain coal tar pitch with a granularity less than 100[mu]m. The coal tar pitch with a granularity less than 100[mu]m reacts with carbon tetrachloride with a concentration of 40-70%, and is treated with liquid-solid separation after the reaction. A liquid phase solution enters into a first distillation operation until carbon tetrachloride does not distill into a condensation receiver. Obtained distilled solid coal tar pitch enters into a second distillation operation, and high-purity coal tar pitch is obtained after distillation, wherein a total ash content is less than 0.0008%, and an impurity content is less than 0.0005%. The invention solves insufficiency of a traditional industrial coal tar pitch physical purification method, and enables effective removal of impurities such as zinc, aluminium, titanium and iron etc. in industrial coal tar pitch.

Description

technical field [0001] The invention relates to a hydrometallurgical method for preparing high-purity coal tar pitch from industrial coal tar pitch. Background technique [0002] Coal tar pitch for industrial use, in which the carbon content of the main component is <85%, and the main impurities such as zinc, aluminum, titanium, and iron are high in content, which cannot meet the raw material requirements for the preparation of high-purity graphite. At present, industrial coal tar pitch is directly applied to industry without purification and impurity removal measures, or for relatively demanding processes, only simple physical removal of mechanical impurities is performed on coal tar pitch, and the chemical impurities are basically not obtained. Removed, the raw material requirements for the preparation of high-purity graphite cannot be reached. For the process of producing high-purity graphite, it is required that the content of Zn<0.0005%, the content of Al<0.00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/00C10C3/08C10C3/06C10B55/02
Inventor 李晓阳谢刚杨大锦李怀仁和晓才徐庆鑫陈家希臧健阎江峰瞿中标刁薇芝于站良
Owner KUNMING METALLURGY INST
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