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Purification method for coal pitch with high softening point

A technology of high softening point and coal tar pitch, which is applied in the field of purification of high softening point coal tar pitch, can solve the problems of high energy consumption, complicated process, and difficult particle size control, and achieve the effect of low energy consumption and simple process steps

Inactive Publication Date: 2014-12-24
SICHUAN CHUANGYUE CARBON MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Invention patent CN 102226093 introduces a method of extracting metal impurities to produce high-purity coal tar pitch. It adopts the method of crushing wet grinding pitch and carbon tetrachloride hot-melt paste distillation. Sub-distillation, complex process and high energy consumption
[0005] In the paper "Effect of Nitric Acid Modification Treatment on the Performance of Activated Carbon", an attempt was made to use nitric acid solution to remove metal impurities on the surface of activated carbon. Due to the method of stirring removal and the lack of special removal of impurity silicon, the final removal effect of metal ions was not ideal.
[0006] In the paper "Ultrasonic Assisted Removal of Metal Impurities in Residual Oil", Chen Feifei et al. used an ultrasonic reactor with metal removal agent to conduct demetallization experiments. The metal removal rate was improved by controlling the ultrasonic time, intensity and frequency, but the effect was limited. , only 83.3%, far from meeting the requirements of raw materials with low QI, low ash and metal impurities

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0020] A kind of purification method of high softening point coal tar pitch of the present embodiment comprises the following steps:

[0021] 1) Mix asphalt with ash content <0.01%, 150°C<softening point<300°C and naphthalene at a ratio of 1:2, and then pass through a high-temperature extrusion granulator and cutter at 80°C to obtain a particle size of 0.1mm, Asphalt granules with a length of 1 mm;

[0022] 2), the asphalt particles prepared in step 1) are extracted with ethanol to obtain porous asphalt particles with a porosity of 50%;

[0023] 3) Use NaOH solution with pH value = 12 to heat to 30°C to extract porous asphalt particles, extract for 2 hours, until the silicon content in the material is <0.001%, and separate the solid and liquid;

[0024] 4), then heat the porous asphalt particles with a silicon content <0.001% obtained in step 3) to 30° C. for 2 hours with an HF solution with a pH value of 1, until the metal content in the porous asphalt particles is <0.002%, ...

Embodiment 2

[0031] A kind of purification method of high softening point coal tar pitch of the present embodiment comprises the following steps:

[0032] 1) Mix asphalt with ash content <0.01%, 150°C<softening point<300°C and naphthalene at a ratio of 2:1, and then pass through a high-temperature extrusion granulator and cutter at 200°C to obtain a particle size of 3 mm and a length of 5mm bitumen particles;

[0033] 2), the asphalt particles prepared in step 1) are extracted with ethanol to obtain porous asphalt particles with a porosity of 80%;

[0034] 3) Use NaOH solution with pH value = 14 to heat to 80°C to extract porous asphalt particles, extract for 40 hours until the silicon content in the material is <0.001%, and then separate the solid and liquid;

[0035] 4), then heat the porous asphalt particles with a silicon content <0.001% obtained in step 3) to 80° C. for 40 hours with an HF solution with a pH value of 4, until the metal content in the porous asphalt particles is <0.00...

Embodiment 3

[0042] A kind of purification method of high softening point coal tar pitch of the present embodiment comprises the following steps:

[0043] 1) Mix asphalt with ash content <0.01%, 150°C<softening point<300°C and naphthalene at a ratio of 1:2, and then pass through a high-temperature extrusion pelletizer and cutter at 150°C to obtain a particle size of 2 mm and a length of 3mm bitumen particles;

[0044] 2), the asphalt granules prepared in step 1) are extracted with ethanol to obtain porous asphalt granules with a porosity of 65%;

[0045] 3) Using NaOH solution with a pH value of 13 to heat to 60°C to extract porous asphalt particles for 30 hours until the silicon content in the material is less than 0.001%, and the solid and liquid are separated;

[0046] 4), then heat the porous asphalt particles with a silicon content <0.001% obtained in step 3) to 65° C. for 30 hours with an HF solution with a pH value of 3, until the metal content in the porous asphalt particles is <0...

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Abstract

The invention discloses a purification method for coal pitch with a high softening point and belongs to the technical field of tar deep processing. The purification method comprises the following steps: mixing pitch with small-molecule aromatic hydrocarbons and obtaining pitch particles by using a granulator and a cutting-off machine; extracting the pitch particles with a solvent to obtain porous pitch particles; extracting the porous tar particles with alkali solution and acid solution to obtain the content of silicon and the content of metal and performing solid-liquid separation; washing the extracted particles with deionized water and performing solid-liquid separation; drying the substances in an inert atmosphere or vacuum environment to obtain purified pitch. The purification method disclosed by the invention has the benefits that the porous pitch particles are extracted by using low-temperature alkali and acid of 30-80DEG C, so that silicon and other metal impurities in the coal pitch are effectively removed; the total ash content of the obtained purified pitch is less than 0.005 percent, the content of the silicon is less than 0.001 percent and the content of the metal impurities is less than 0.002 percent; higher use requirement can be met; besides, the purification method is simple in process step and lower in energy consumption.

Description

technical field [0001] The invention belongs to the technical field of asphalt deep processing, and in particular relates to a method for purifying coal tar pitch with a high softening point. Background technique [0002] As a by-product of tar processing, asphalt has a high yield and its added product value. The production and preparation of high-quality needle coke, mesophase pitch and other products require purified asphalt raw materials with low QI, low ash and metal impurities, but the raw materials currently provided by the market cannot meet the requirements of high-quality needle coke, mesophase pitch and other products with low QI and low raw materials. The requirements of ash and metal impurities seriously restrict the development of these additional products. One of the reasons is that the current coal tar pitch purification method mainly focuses on the removal of QI, but there is little in-depth research on the technology of continuing to remove impurities such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/00C10C3/14C10C3/08
Inventor 李丰伍孝
Owner SICHUAN CHUANGYUE CARBON MATERIAL
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