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Method for extracting, producing and purifying pitch with mixed solvent

A technology for mixing solvent and bitumen, applied in the field of production and purification of bitumen, can solve the problems of complex process, large amount of solvent used, cumbersome operation of filter membrane, etc., and achieve the effect of high yield

Active Publication Date: 2010-07-28
沈建立
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the process is not perfect
[0007] (4) Japanese Patent Publication No. Showa 54-10326 discloses a method for removing quinoline insolubles by centrifugal sedimentation. The process is complicated and the requirements for environmental protection equipment are high, and quinoline insolubles cannot be completely removed.
[0008] (5) Chinese patent CN101508903A discloses a process for continuous removal of quinoline insolubles in coal tar pitch, but cannot completely remove quinoline insolubles
[0009] (6) Chinese patent CN101294090A discloses a method for refining coal tar pitch, but uses toxic solvents such as quinoline, and the amount of solvent used is too much, the operation of the filter membrane is cumbersome, and industrialization is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preheat the coal tar pitch raw material with a softening point of 89°C to 130°C. The three solvents A, B, and C are composed according to the ratio of A / B / C=1 / 1.5 / 1.5. Wherein, solvent A is methylnaphthalene, solvent B is kerosene, and solvent C is a mixture containing indole, thiaindene heterocyclic aromatic hydrocarbon, naphthalene or its homologues. The preheating temperature is 130°C. Blend the preheated coal tar pitch raw material with the prepared mixed solvent in a mixing device, coal tar pitch raw material / solvent = 1 / 3.0. After the blended mixture was uniformly mixed at a temperature of 130° C., centrifugation was carried out. The supernatant liquid is rectified to separate the mixed solvent and obtain purified bitumen. The prepared purified asphalt does not contain quinoline insolubles (QI) at all, the yield of the obtained purified asphalt is 83%, and the softening point of the obtained purified asphalt is 72°C.

Embodiment 2

[0035] Preheat the coal tar pitch raw material with a softening point of 90°C to 130°C. The three solvents A, B, and C are composed according to the ratio of A / B / C=1 / 1.2 / 1.2. Wherein, the solvent A is biphenyl, the solvent B is kerosene, and the solvent C is a mixture containing indole, thiaindene heterocyclic aromatic hydrocarbon, naphthalene or its homologues. The preheating temperature is 130°C. Blend the preheated coal tar pitch raw material with the prepared mixed solvent in a mixing device, coal tar pitch raw material / solvent = 1 / 3.0. After the blended mixture was uniformly mixed at a temperature of 130° C., centrifugation was carried out. The supernatant liquid is rectified to separate the mixed solvent and obtain purified bitumen. The prepared purified asphalt does not contain quinoline insolubles (QI) at all, the yield of the obtained purified asphalt is 81%, and the softening point of the obtained purified asphalt is 75°C.

Embodiment 3

[0037] Preheat the coal tar pitch raw material with a softening point of 60°C to 90°C. The three solvents A, B, and C are composed according to the ratio of A / B / C=1 / 1.5 / 1.5. Among them, solvent A is dimethylnaphthalene, solvent B is kerosene, and solvent C is a mixture containing indole, thiaindene heterocyclic aromatic hydrocarbon, naphthalene or its homologues. The preheating temperature was 110°C. Blend the preheated coal tar pitch raw material with the prepared mixed solvent in a mixing device, coal tar pitch raw material / solvent=1 / 2.5. After the blended mixture was uniformly mixed at a temperature of 110° C., centrifugation was carried out. The supernatant liquid is rectified to separate the mixed solvent and obtain purified bitumen. The prepared purified asphalt does not contain quinoline insolubles (QI) at all, the yield of the obtained purified asphalt is 80%, and the softening point of the obtained purified asphalt is 47°C.

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Abstract

The invention relates to a preparation method for purifying pitch, which comprises the steps of completely removing quinoline insolubles (QI) through extracting coal tar pitch with mixed solvent to obtain the purified pitch without QI. The purified pitch produced by the method can meet the requirement of producing carbon fiber and needle coke. The method has simple process, convenient preparation, easy operation, environmental protection and no pollution.

Description

technical field [0001] The invention belongs to a method for producing purified asphalt, in particular to a method for extracting coal tar pitch with a mixed solvent to provide raw materials for producing carbon fiber and needle coke and purified asphalt for electrode impregnation. Background technique [0002] Needle coke is the main raw material for the production of ultra-high power graphite electrodes. Usually, the raw material for producing needle coke should be purified pitch without quinoline insolubles (QI). Coal tar pitch contains quinoline insolubles, which will hinder the growth of small spheres and fail to form graphitized structures when the pitch is thermally transformed into mesophase spheres. Therefore, when coal tar pitch is used to prepare high-quality needle coke raw materials, the coal tar pitch must be purified to remove quinoline insolubles. [0003] At present, the raw material production technology of coal-based needle coke mainly includes the follow...

Claims

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Application Information

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IPC IPC(8): C10C3/08
Inventor 沈建立
Owner 沈建立
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