Multi-key cooperative controllable method for promoting stabilization of medium-low temperature asphalt

A low-temperature asphalt stabilization technology, applied in the processing of tar pitch/petroleum pitch/natural pitch, processing tar pitch/petroleum pitch/natural pitch by heating, processing tar pitch/petroleum pitch/natural pitch by chemical methods, etc. It can solve problems such as narrow temperature range, affecting product performance, and single active group, so as to achieve the effect of increasing yield, reducing requirements, and reducing escape

Active Publication Date: 2019-10-11
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above patent documents, only one type of modifier is added in the pro-oxidation method. Since the introduced active groups are relatively single, they either do not react during heating and oxidation, or after reaching the reaction temperature, a large number of active groups participate to cause oxidation. Uncontrollable, resulting in a "skin-core" structure, which affects product performance; and the temperature range for initiating the reaction is still narrow, and it is impossible to achieve stabilization in the entire temperature range, especially for medium and low softening point asphalt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A mixture of coal tar pitch with a softening point of 120°C, a low-temperature accelerator tert-butyl peroxypivalate and a high-temperature accelerator tert-butyl peroxybenzoate (mass ratio 1:2) (the total amount of the accelerator accounts for 8% of the mass) and mixed evenly, heated to 160°C in a high-pressure reactor, stirred at a constant temperature for 0.5 h, cooled and discharged to obtain modified asphalt; the modified asphalt was processed into asphalt balls with a diameter of 500 μm, and then the obtained asphalt was The ball is placed in a tube furnace, under an air atmosphere, at 2°C min -1 Heat up to 330°C, keep the temperature constant for 0 h, cool down and discharge to obtain oxidized pitch balls. After the obtained oxidized pitch pellets were carbonized at 800°C, the yield reached 92%, the sphericity remained at 95%, and the strength was 97%.

Embodiment 2

[0029] A mixture of petroleum asphalt with a softening point of 100°C, a low-temperature accelerator diisobutyl peroxydicarbonate and a high-temperature accelerator 2,2-di(tert-butylperoxy)butane (mass ratio 1:1) ( The total amount of accelerator accounted for 10% of the mass of the precursor) and mixed evenly, heated to 130°C in a high-pressure reactor, stirred at a constant temperature for 2 h, cooled and discharged to obtain modified asphalt; the modified asphalt was processed into a diameter of 50 μm Pitch carbon fiber, then put the obtained pitch carbon fiber in a tube furnace, under an oxygen atmosphere, at 1 °C min -1 Heating up to 250°C, keeping the temperature constant for 3 hours, cooling down and discharging, the oxidized pitch carbon fiber is obtained. After the obtained oxidized pitch carbon fiber is carbonized at 700°C, the yield reaches 90%, the degree of mutual fusion is less than 3%, and the strength is 98%.

Embodiment 3

[0033] A mixture of natural asphalt with a softening point of 40°C, a low-temperature accelerator azobisisobutylamidine hydrochloride and a high-temperature accelerator benzoyl peroxide (mass ratio of 2:5) (the total amount of the accelerator accounts for the mass of the precursor 15% of ) mixed evenly, heated to 70°C in a high-pressure reactor, stirred at a constant temperature for 3 h, cooled and discharged to obtain modified asphalt; the modified asphalt was processed into pitch carbon fibers with a diameter of 30 μm, and then the obtained pitch carbon fibers Placed in a tube furnace, under an oxygen atmosphere, at 5°C min -1 Heating up to 180°C, keeping the temperature constant for 5 hours, cooling down and discharging, the oxidized pitch carbon fiber is obtained. After the obtained oxidized pitch carbon fiber is carbonized at 500°C, the yield reaches 88%, the degree of mutual fusion is less than 5%, and the strength is 98%.

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Abstract

The invention discloses a multi-key cooperative controllable method for promoting the stabilization of medium-low temperature asphalt. The method includes heating and mixing the medium-low temperatureasphalt and an accelerator uniformly in a high-pressure reaction kettle, cooling and discharging to obtain modified asphalt; placing a molding intermediate prepared from the modified asphalt in a tubular furnace, heating to 180-330 DEG C by heating 1-5 DEG C per minute, keeping the temperature for 0-5 hours, cooling and discharging to obtain a stabilized asphalt product; and carbonizing the stabilized product at 500-1500 DEG C to obtain an asphalt-based carbon product. The method has the advantages of simple operation process and low cost, solves the problems of difficult stabilization and poor controllability of medium-low temperature asphalt, promotes the high-value utilization of low-value raw materials, and is expected to be popularized industrially.

Description

technical field [0001] The invention relates to an asphalt stabilization method, in particular to a multi-bond synergistic and controllable method for promoting the stabilization of medium and low temperature asphalt. Background technique [0002] Pitch-based carbon materials have been widely used in the fields of biomedicine, environmental protection, military protection, and electrode materials due to their low ash content, high degree of graphitization, and high mechanical strength. At present, pitch-based carbons that are widely used include C / C composites, carbon fibers, and spherical activated carbons. The above pitch-based carbon products usually have a specific morphology. During the preparation process, in order to maintain the shape of the formed intermediate, avoid a large amount of volatilization of light components in the pitch, and prevent problems such as melting deformation and bubbling, the pitch Activated carbons must be oxidatively stabilized before being...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/02C10C3/00
CPCC10C3/002C10C3/026
Inventor 李开喜张果丽管涛涛
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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