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High-softening-point coal-tar pitch production method

A technology of high softening point asphalt and its production method, which is applied in the direction of processing tar pitch/petroleum pitch/natural pitch by chemical methods, processing tar pitch/petroleum pitch/natural pitch by distillation, etc., which can solve uneven oxidation and difficulty in discharging , Low oxidation efficiency and other issues, to achieve the effect of simple production process, less impurity content and high purity

Active Publication Date: 2012-10-17
内蒙古隆通碳纤维技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solvent deasphalting process has problems such as high energy consumption, serious heating and coking problems, and difficulty in discharging materials due to high viscosity, while the traditional oxidation asphalt process has problems such as low oxidation efficiency and uneven oxidation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add low-QI purified coal tar pitch into the stirring tank, and continuously feed air, stir during the ventilation process, and carry out air oxidation at 250°C for 6 hours; then add the oxidized pitch to the thin film evaporator , under the conditions of 320°C and vacuum negative pressure of 0.06MPa, thin-film distillation is carried out to remove light components. After distillation for 2 hours, the distillation process is completed to obtain high softening point pitch. The softening point of the obtained high softening point coal tar pitch is 270-290°C , coking value ≥ 70%, QI ≤ 25%, reaching the expected product standard.

Embodiment 2

[0023] Add low-QI purified coal tar pitch into the stirring tank, and continuously feed air, stir during the ventilating process, and carry out air oxidation at 260°C for 6.5 hours; then add the oxidized pitch to the thin film evaporator In the process, thin-film distillation is carried out under the conditions of 330°C and vacuum negative pressure of 0.07MPa to remove light components. After the distillation time is 2.5h, the distillation process is completed to obtain high softening point pitch. The softening point of the obtained high softening point coal tar pitch is 270~ 290℃, coking value ≥ 70%, QI ≤ 25%, reaching the expected product standard.

Embodiment 3

[0025] Add low-QI purified coal tar pitch into the stirring tank, and continuously feed air, stir during the ventilation process, and carry out air oxidation at 270°C for 7 hours; then add the oxidized pitch to the thin film evaporator , under the conditions of 340°C and vacuum negative pressure of 0.08MPa, thin-film distillation is carried out to remove light components, and the distillation time is 3h. After the distillation process is completed, high softening point pitch is obtained. The softening point of the obtained high softening point coal tar pitch is 270-290°C. Coking value ≥ 70%, QI ≤ 25%, reaching the expected product standard.

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Abstract

The invention relates to a high-softening-point coal-tar pitch production method, which is mainly and technically characterized in that the method comprises the following steps of: (1) adding low-QI (Quality Index) purified coal-tar pitch into a stirring tank, continuously feeding air into the stirring tank, carrying out stirring in the process of feeding air, and carrying out air oxidation under the condition of 200-300 DEG C, wherein the oxidation time is 4-12 h; and (2) after the oxidation is completed, adding the pitch into a film evaporator, carrying out thin-film distillation on the pitch at a temperature of 300-350 DEG C and under a vacuum negative pressure of 0.05-0.099 Mpa, removing light components in the pitch, and carrying out distillation treatment on the obtained product for one to four hours so as to obtain high-softening-point coal-tar pitch. The method disclosed by the invention is reasonable in design; and the softening point of high-softening-point coal-tar pitch produced by taking the low-QI purified coal-tar pitch as raw materials reaches 270-290 DEG C, and the high-softening-point coal-tar pitch is low in impurity content, high in purity, simple in production process, energy-saving and environmental-friendly, and can be widely applied to the production of cathode materials jackets for lithium ion batteries and carbon fibers.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, in particular to a production method of high softening point coal tar pitch. Background technique [0002] Due to its superior high temperature resistance, high softening point asphalt has been widely used. Usually, the preparation method of high softening point asphalt is relatively complicated, with high requirements and complicated follow-up treatment. At the same time, too high QI value will affect the application performance of asphalt. When pitch with a high softening point is used as a negative electrode coating material for lithium-ion batteries, the coated graphite particles are easy to bond and cause the coating layer to fall off and be damaged in the subsequent crushing process, which affects the overall performance of the negative electrode material; used for carbon fiber When spinning raw materials, if the QI is too high, it will seriously affect the performance of ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/04C10C3/06
Inventor 遇秉武
Owner 内蒙古隆通碳纤维技术有限公司
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