Coal pitch refining method used for synthesizing mesophase pitch

A technology of mesophase pitch and refining method, which is applied in the processing of tar pitch/petroleum pitch/natural pitch by distillation, solidification/crushing processing of tar pitch/petroleum pitch/natural pitch, processing of tar pitch/petroleum pitch/natural pitch, etc. , can solve the problem that asphalt cannot be used as raw materials for high-end carbon materials, and achieve the effects of controllable molecular weight of asphalt, mild separation conditions, and simple process equipment

Active Publication Date: 2018-06-01
SHANDONG RUICHENG AEROSPACE CARBON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a coal tar pitch refining method for synthesizing mesophase pitch, to solve the t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The coal tar pitch refining method for synthesizing mesophase pitch, the specific steps are as follows:

[0025] Step 1) Crush the coal tar pitch and pass it through a 200-mesh sieve. Add the mixed solvent A to the coal tar pitch according to the ratio of coal tar pitch and mixed solvent A at a weight ratio of 1:3. After 30 minutes, let it stand for 15 minutes, and separate layers, the upper layer is a mixed solution A of mixed solvent A and coal tar pitch, and the lower layer is impurities containing coal powder coke particles;

[0026] Step 2) fine filtration: take the mixed solution A of the upper layer, filter it with 0.45 micron filter paper, and recover the mixed solvent A by distillation to obtain crude coal tar pitch;

[0027] Step 3) Add the mixed solvent B to the crude coal tar pitch according to the weight ratio of the crude coal tar pitch and the mixed solvent B at a weight ratio of 1:3. At 90°C, the stirring speed is 300 rpm. After stirring for 30 minutes, ...

Embodiment 2

[0030] The coal tar pitch refining method for synthesizing mesophase pitch, the specific steps are as follows:

[0031] Step 1) Crush the coal tar pitch and pass it through a 200-mesh sieve. Add the mixed solvent A to the coal tar pitch according to the weight ratio of the coal tar pitch and the mixed solvent A at a ratio of 1:4. After 35 minutes, let it stand for 20 minutes, and separate layers, the upper layer is a mixed solution A containing mixed solvent A and coal tar pitch, and the lower layer is impurities containing pulverized coal coke particles;

[0032] Step 2) fine filtration: take the mixed solution A of the upper layer, filter it with 0.45 micron filter paper, and recover the mixed solvent A by distillation to obtain crude coal tar pitch;

[0033] Step 3) Add the mixed solvent B to the crude coal tar pitch according to the weight ratio of the crude coal tar pitch and the mixed solvent B at a weight ratio of 1:4. At 70°C, the stirring speed is 300 rpm. After stirr...

Embodiment 3

[0036] The coal tar pitch refining method for synthesizing mesophase pitch, the specific steps are as follows:

[0037] Step 1) Crush the coal tar pitch and pass it through a 200-mesh sieve. Add the mixed solvent A to the coal tar pitch according to the weight ratio of the coal tar pitch and the mixed solvent A at a ratio of 1:5. After 28 minutes, let it stand for 15 minutes, and separate layers, the upper layer is a mixed solution A containing mixed solvent A and coal tar pitch, and the lower layer is impurities containing coal powder coke particles;

[0038] Step 2) fine filtration: take the mixed solution A of the upper layer, filter it with 0.45 micron filter paper, and recover the mixed solvent A by distillation to obtain crude coal tar pitch;

[0039] Step 3) Add the mixed solvent B to the crude coal tar pitch according to the weight ratio of the crude coal tar pitch and the mixed solvent B at a weight ratio of 1:5. At 100°C, the stirring speed is 300 rpm. After stirring...

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PUM

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Abstract

The invention relates to a coal pitch refining method used for synthesizing mesophase pitch. The coal pitch refining method used for synthesizing mesophase pitch comprises following steps: coal pitchis smashed and sieved, a mixed solvent A is added into coal pitch, an obtained mixture is stirred, is allowed to stand, and is subjected to layering so as to obtain an upper layer which is a mixed solution A of the mixed solvent A and coal pitch, and a lower layer which is an impurity mixture containing coal powder coke particles; the upper layer mixed solution A is subjected to filtering and distillation for recovery of the mixed solvent A so as to obtain crude coal pitch; a mixed solvent B is added into the crude coal pitch, and stirring, standing, and layering are carried out so as to obtain an upper layer which is a mixed solution B of the mixed solvent B and refined coal pitch, and a lower layer which is a heavy asphalt impurity mixture; the upper layer mixed solution B is subjected to filtering and distillation for recovery of the mixed solvent B so as to obtain refined coal pitch can be used for synthesizing mesophase pitch. The coal pitch refining method is capable of realizingseparation of coal pitch effective components with impurities such as coal powder coke particles under normal pressure conditions, the obtained refined coal pitch can be taken as a high grade carbonmaterial raw material, and the requirements of subsequent high added value product production are satisfied.

Description

technical field [0001] The invention belongs to the technical field of asphalt refining, in particular to a coal tar pitch refining method for synthesizing mesophase pitch. Background technique [0002] Coal tar pitch is a conventional distillation product of coal tar, which contains a large amount of coal powder and coke particles brought in during the production of coal tar and secondary polymer impurities produced during high-temperature distillation. These impurities are difficult to remove through general treatment methods. As a result, pitch can only be used as a low-end product and cannot be further refined into carbon fiber or needle coke. [0003] At present, domestic asphalt refining methods mostly use hot-melt filtration and centrifugation. The disadvantage is that it cannot effectively remove impurities with small particle sizes in coal tar pitch, and the operation is relatively complicated. To a certain extent, the original components of asphalt are destroyed, r...

Claims

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Application Information

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IPC IPC(8): C10C3/00C10C3/16C10C3/06
CPCC10C3/00C10C3/06C10C3/16
Inventor 王硕王象东刘辉张学军陈维强
Owner SHANDONG RUICHENG AEROSPACE CARBON MATERIAL CO LTD
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