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Method for preparing special asphalt by separating coal tar step by step

A kind of coal tar, special technology, applied in the direction of tar processing through distillation, tar processing through selective solvent extraction, etc., can solve the problem that pitch cannot be used as high-end carbon material raw materials, and achieve controllable molecular weight of pitch, mild separation conditions, The effect of simple process equipment

Active Publication Date: 2020-08-21
SHANDONG RUICHENG AEROSPACE CARBON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing special asphalt by separating coal tar step by step, and solve the technical problem that the asphalt obtained by the conventional distillation process cannot be used as a raw material for high-end carbon materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The method for preparing special pitch by separating coal tar step by step, the concrete steps are as follows:

[0029] Step 1) Preparation of mixed solution A: under normal temperature and pressure, add mixed solvent A to coal tar according to the weight ratio of coal tar and mixed solvent A of 1:5, stirring at 300 rpm, stirring for 30 minutes, then standing for 15 minutes. The system is layered, the upper layer is a mixed solution A containing mixed solvent A and coal tar, and the lower layer is impurities containing coal powder coke particles;

[0030] Step 2) Coal tar primary separation: take the mixed solution A in the upper layer, filter it with 0.45 micron filter paper, distill and recover the mixed solvent A, and obtain the coal tar primary separation;

[0031] Step 3) Preparation of mixed solution B: under normal temperature and pressure, add mixed solvent B to the primary coal tar isolate according to the weight ratio of coal tar primary isolate and mixed solv...

Embodiment 2

[0036] The method for preparing special pitch by separating coal tar step by step, the concrete steps are as follows:

[0037] Step 1) Preparation of mixed solution A: under normal temperature and pressure, add mixed solvent A to coal tar according to the weight ratio of coal tar and mixed solvent A of 1:6, stirring at 300 rpm, stirring for 25 minutes, then standing for 20 minutes. The system is layered, the upper layer is a mixed solution A containing mixed solvent A and coal tar, and the lower layer is impurities containing coal powder coke particles;

[0038] Step 2) Coal tar primary separation: Take the upper layer mixed solution A, filter it with 0.45 micron filter paper, distill and recover the mixed solvent A, and obtain the coal tar primary separation;

[0039] Step 3) Preparation of mixed solution B: under normal temperature and pressure, add mixed solvent B to the primary coal tar isolate according to the weight ratio of coal tar primary isolate and mixed solvent B a...

Embodiment 3

[0044] The method for preparing special pitch by separating coal tar step by step, the concrete steps are as follows:

[0045] Step 1) Preparation of mixed solution A: under normal temperature and pressure, add mixed solvent A to coal tar according to the weight ratio of coal tar to mixed solvent A of 1:8, stirring at 300 rpm, stirring for 35 minutes, and then standing for 18 minutes. The system is layered, the upper layer is a mixed solution A containing mixed solvent A and coal tar, and the lower layer is impurities containing coal powder coke particles;

[0046] Step 2) Coal tar primary separation: take the mixed solution A in the upper layer, filter it with 0.45 micron filter paper, distill and recover the mixed solvent A, and obtain the coal tar primary separation;

[0047] Step 3) Preparation of mixed solution B: under normal temperature and pressure, add mixed solvent B to the primary coal tar isolate according to the weight ratio of coal tar primary isolate to mixed so...

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Abstract

The invention relates to a method for preparing special asphalt from coal tar through progressive separation. The method comprises the following specific steps: proportionally adding a mixed solvent Ainto the coal tar, carrying out stirring, carrying out standing, and carrying out layering, so as to obtain an upper-layer mixed solution A; taking the upper-layer mixed solution A, carrying out filtering, and carrying out distilling to recover the mixed solvent A, so as to obtain a first-stage separated product of the coal tar; proportionally adding a mixed solvent B into the first-stage separated product of the coal tar, carrying out stirring, carrying out standing, and carrying out layering, so as to obtain an upper-layer mixed solution B; taking the upper-layer mixed solution B, and carrying out distilling to recover the mixed solvent B, so as to obtain a light component of the coal tar; proportionally adding a mixed solvent C into the light component of the coal tar, carrying out intensive mixing, carrying out standing, and carrying out layering, so as to obtain an upper-layer mixed solution C; taking the upper-layer mixed solution C, carrying out filtering, and carrying out distilling to recover the mixed solvent C, thereby obtaining the special asphalt. According to the method, the special asphalt can be obtained from the coal tar through progressive separation at normal temperature under normal pressure and can be applied to high-end carbon-material raw materials, and the requirements of subsequent preparation on products with high added values are met.

Description

technical field [0001] The invention belongs to the technical field of asphalt refining, in particular to a method for preparing special asphalt by separating coal tar step by step. Background technique [0002] Coal tar is a by-product of coal coking. Coal is heated to a certain temperature in the absence of air to partially gasify, and the gas is washed and captured by a tar trap to obtain coal tar. [0003] Most of the domestic one-tower or two-tower processes are used to distill and separate coal tar to prepare asphalt. [0004] Distillation process to prepare asphalt requires high temperature of 400-500 ℃, high energy consumption, complicated process and high investment cost. [0005] A large amount of coal tar remains in the bitumen obtained by the distillation process, coal powder and coke particles brought in during the production process, and secondary polymer impurities produced during the high-temperature distillation process are difficult to remove by general tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10C1/18C10C1/04
CPCC10C1/04C10C1/18
Inventor 王硕王象东刘辉高昂王腾
Owner SHANDONG RUICHENG AEROSPACE CARBON MATERIAL CO LTD
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