Method for preparing mesophase pitch by utilizing mesotherm coal pitch

A technology of mesophase pitch and coal tar pitch, which is applied in the field of preparation of mesophase pitch, can solve the problems of poor optical structure of mesophase pitch ash content, and achieve the effects of reduced production cost, excellent optical structure and low ash content

Active Publication Date: 2017-09-15
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

[0006] At present, the raw materials for preparing mesophase pitch include coal tar pitch, petroleum pitch, naphthalene, etc., and the prepared mesophase pitch has high ash content and poor optical structure, so how to prepare mesophase with low ash content and excellent optical structure Asphalt has become a difficult problem that needs to be solved urgently

Method used

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  • Method for preparing mesophase pitch by utilizing mesotherm coal pitch
  • Method for preparing mesophase pitch by utilizing mesotherm coal pitch

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Experimental program
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Effect test

Embodiment 1

[0020] A device for preparing mesophase pitch from medium-temperature coal tar pitch, which includes a thermal condensation polymerization kettle 1, a thermal filter kettle 2, a material receiving tank 3, an agitator 4, a discharge valve 5 and a filter screen 6, and is characterized in that the thermal condensation polymerization kettle 1 is equipped with There is an agitator 4, and the outlet at the bottom of the thermal condensation polymerization kettle 1 is connected to the inlet of the hot filter kettle 2 through a connecting pipe 7, and the hot filter kettle 2 and the receiving tank 3 are connected by flanges, and there is a filter screen 6 at the bottom of the hot filter kettle 2 , there is a discharge valve 5 on the connecting pipe 7.

[0021] The method for preparing mesophase pitch by the medium temperature coal tar pitch is completed in the following steps:

[0022] a. Preparation of refined medium-temperature coal tar pitch: first, add medium-temperature coal tar p...

Embodiment 2

[0026] The method for preparing mesophase pitch by the medium temperature coal tar pitch is completed in the following steps:

[0027] a. Preparation of refined medium-temperature coal tar pitch: First, add medium-temperature coal tar pitch with a softening point of 80°C into thermal condensation polymerization kettle 1, close the feeding port, and use a vacuum pump to pump out the air in thermal condensation polymerization kettle 1, then fill the kettle with nitrogen (heat filter kettle 2 and the material receiving tank 3 are purged with nitrogen and then protected by nitrogen), after 2 hours, the temperature is raised to 430 °C, and the pressure is 4 MPa, and the stirring speed is 400r / min. The reaction is 2 hours, and the mesophase carbon microspheres or fine mosaic mesophase are generated. Then reduce the pressure in the thermal condensation polymerization kettle 1 to 2MPa, open the discharge valve 5 at the bottom of the thermal condensation polymerization kettle 1, and pre...

Embodiment 3

[0031] The method for preparing mesophase pitch by the medium temperature coal tar pitch is completed in the following steps:

[0032] a. Preparation of refined medium-temperature coal tar pitch: first, add medium-temperature coal tar pitch with a softening point of 90°C into heat condensation polymerization kettle 1, close the feeding port, and use a vacuum pump to pump out the air in heat condensation polymerization kettle 1, then fill the kettle with nitrogen (heat filter kettle 2 and the material receiving tank 3 are purged with nitrogen and then protected by nitrogen), after 2 hours, the temperature is raised to 450°C, and the pressure is 4.2MPa, and the stirring speed is 450r / min. The reaction is 1h, and the mesophase carbon microspheres or fine mosaic mesophase are generated. , and then reduce the pressure in the thermal condensation polymerization kettle 1 to 1.5MPa, open the bottom discharge valve 5 of the thermal condensation polymerization kettle 1, and press the the...

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Abstract

The invention discloses a method for preparing mesophase pitch on the basis of mesotherm coal pitch used as a raw material. The method comprises the following steps: firstly, performing preheating polycondensation reaction, precise heat filtering and cutting light component treatment on the mesotherm coal pitch, thereby acquiring refined coal pitch with ultralow quinoline insoluble content, and then performing heating polycondensation reaction for 1-10h on the refined coal pitch under the reaction temperature of 400-460 DEG C, pressure of 3-5MPa and stirring speed of 50-500r/min, thereby acquiring the mesophase pitch. According to the invention, an integrated device is adopted for simultaneously completing the operations, such as, heating polycondensation and heat filtering and is assisted by simple light component cutting and drying technologies to prepare high-quality mesophase pitch; the production technology is simplified; the production cost is lowered; the yield of the acquired mesophase pitch is within 10-30%; the pitch is low in ash content and has an excellent optical tissue structure.

Description

technical field [0001] The invention belongs to a method for preparing mesophase pitch, and in particular relates to a method for preparing mesophase pitch by using medium-temperature coal tar pitch. Background technique [0002] Coal tar pitch is the full name of coal tar pitch, which is the residue after distillation and extraction of coal tar. Coal tar is obtained as a by-product of high-temperature dry distillation of coal when producing metallurgical coke for ironmaking or producing civil gas. coal tar [0003] Coal tar pitch is a bulk product separated during the processing of coal tar. Coal tar pitch is a black solid at room temperature, has no fixed melting point, and is in a glass phase. It softens and then melts after being heated. The composition of coal tar pitch is extremely complex. There are more than 70 kinds of identified compounds, most of which are polycyclic aromatic hydrocarbons with more than three rings, and also contain heterocyclic compounds of O, N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/02C10C1/20C10C1/00
CPCC10C1/00C10C1/20C10C3/02
Inventor 刘占军李国栋张兴华郭全贵
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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