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A method for preparing high-purity aromatic pitch for high-end carbon materials

A carbon material and aromatic hydrocarbon technology, which is applied in the field of preparation of high-purity aromatic hydrocarbon pitch for high-end carbon materials, can solve the problems of low purity of pitch and difficult purification, and achieve the effects of simple equipment, low cost and high purification accuracy.

Active Publication Date: 2020-11-17
湖南东映碳材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly aims at the problems of low purity and difficult purification technology of pitch used for high-end carbon materials, and provides a method for preparing high-purity aromatic pitch with simple process, low energy consumption, low cost, good separation effect and low investment cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing high-purity aromatic pitch for high-end carbon materials, comprising the following steps:

[0023] (1) Adopt a steel-lined polytetrafluoroethylene material airtight container, dissolve 100 parts of aromatic hydrocarbon pitch obtained by catalyzed polymerization of pure naphthalene (aluminum chloride) with a softening point of 80 ° C, an ash content of 300 ppm, and 300 parts of toluene;

[0024] (2) Add 20 parts of boron trifluoride diethyl ether complex, high-speed shearing and stirring for 3 hours, and leave to stand at room temperature for stratification;

[0025] (3) Extract the upper low-density liquid phase (density 0.93g / ml), leaving the bottom high-density boron trifluoride-aromatic pitch complex (density 1.31g / ml);

[0026] (4) Add 100 parts of toluene and 10 parts of pyridine to the high-density boron trifluoride-aromatic asphalt complex at the bottom of the obtained mixture, stir slowly for 2 hours, leave to stand for stratification, and...

Embodiment 2

[0031] A method for preparing high-purity aromatic pitch for high-end carbon materials, comprising the following steps:

[0032] (1) Adopt a steel-lined polytetrafluoroethylene material airtight container, dissolve 100 parts of coal tar pitch with a softening point of 40 ° C, an ash content of 700 ppm, a sulfur content of 8200 ppm, and a nitrogen content of 5700 ppm in 900 parts of toluene;

[0033] (2) Add 200 parts of boron trifluoride diethyl ether complex, high-speed shearing and stirring for 10 hr, and leave to stand at room temperature for stratification;

[0034] (3) Extract the upper low-density liquid phase (density 0.86g / ml), leaving the bottom high-density boron trifluoride-aromatic pitch complex (density 1.28g / ml);

[0035] (4) Add 100 parts of toluene and 50 parts of pyridine to the high-density boron trifluoride-aromatic asphalt complex at the bottom of the obtained mixture, stir slowly for 2 hr, leave to stand for stratification, and then filter off the bottom s...

Embodiment 3

[0040] A method for preparing high-purity aromatic pitch for high-end carbon materials, comprising the following steps:

[0041] (1) Adopt a steel-lined polytetrafluoroethylene material airtight container, dissolve 100 parts of FCC oil slurry pitch with a softening point of less than 30°C, ash content of 100 ppm, sulfur content of 11600 ppm, and nitrogen content of 2300 ppm in 200 parts of toluene and 200 parts of step (3 ) in the mixed solution of the upper low-density liquid phase extracted;

[0042] (2) Add 100 parts of boron trifluoride diethyl ether complex, high-speed shearing and stirring for 8 hours, and leave to stand at room temperature for stratification;

[0043] (3) Extract the upper low-density liquid phase (density 0.92g / ml, about 420 parts, recycle), leaving the bottom high-density boron trifluoride-aromatic pitch complex (density 1.25g / ml, about 180 parts) ;

[0044] (4) Add 100 parts of toluene and 50 parts of pyridine to the high-density boron trifluoride-...

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Abstract

The invention belongs to the technical field of a preparation method for high-purity aromatic hydrocarbon pitch used for a high-end carbon material, and specifically relates to a preparation method for low-ash, low-sulfur and high-purity aromatic hydrocarbon pitch used for preparation of mesophase pitch. The preparation method comprises the following steps: dissolving aromatic hydrocarbon pitch into toluene, then adding a boron trifluoride-diethyl ether complex, carrying out stirring for layering at a normal temperature, separating out a high-density boron trifluoride-aromatic hydrocarbon pitch complex obtained at a bottom part, then adding the toluene and pyridine, further carrying out stirring for layering, removing a majority of the boron trifluoride, adding ammonia water and low-molecular alcohol or a surfactant, carrying out extraction for a plurality of times, and carrying out distillation so as to obtain the high-purity aromatic hydrocarbon pitch. The preparation method provided by invention is performed at a normal temperature, has low energy consumption and good purification and separation effects, is simple in equipment and low in investment and cost, and avoids the disadvantages of a conventional filtration and hydrogenation process.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of high-purity aromatic pitch for high-end carbon materials, and in particular relates to a preparation method of high-purity aromatic pitch with low ash content and low sulfur content for preparing mesophase pitch. Background technique [0002] Pitch is an indispensable raw material for high-end carbon materials, especially mesophase pitch, which can be used to prepare carbon materials through liquid-phase carbonization, and is widely used in high-performance carbon fibers, mesocarbon microspheres, needle coke, and high thermal conductivity C / C composite materials , high thermal conductivity graphite, etc. Raw materials for high-end carbon materials, especially raw materials for mesophase pitch, generally require aromatic pitches to have better planarity of aromatic molecules, less heteroelements other than C and H, and further require short alkane molecules or branch chains and low a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10C3/02
CPCC10C3/023
Inventor 刘金水伍孝叶崇李凯黄东沈威威张仕杰
Owner 湖南东映碳材料科技股份有限公司
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