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Treatment method for mixed asphalt as raw material for preparing needle coke

A technology of needle coke raw material and mixed asphalt, which is applied in the processing of tar pitch/petroleum pitch/natural pitch, distillation processing of tar pitch/petroleum pitch/natural pitch, petroleum industry, etc. Low bending strength, high resistivity, etc.

Active Publication Date: 2014-08-06
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that when the needle coke prepared by the mixed pitch formed by petroleum pitch and coal pitch is used in the prior art to make electrodes, the obtained electrodes have high coefficient of thermal expansion, low flexural strength, and high resistivity, which affect the use of electrodes. Performance problems; and then propose a treatment method for mixed pitch as a raw material of needle coke. When using the needle coke prepared by the above mixed pitch to make electrodes, the thermal expansion coefficient and resistivity of the electrodes can be reduced, and the resistance of the electrodes can be improved. Bending strength

Method used

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  • Treatment method for mixed asphalt as raw material for preparing needle coke
  • Treatment method for mixed asphalt as raw material for preparing needle coke

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. Mix the medium temperature coal pitch with a softening point of 70°C and the petroleum pitch with a softening point of 40°C according to a weight ratio of 9:1 and mix them uniformly at 200°C to obtain a mixed pitch;

[0022] b. Mix the mixed asphalt and washing oil according to the weight ratio of 1:2 and keep it at 220°C for 40min, and then centrifugally treat it for 2min under the conditions of 2000G centrifugal force and 180°C to obtain the raw material mother liquor with decontamination;

[0023] c. After the raw material mother liquor is heated to 370°C, the pump is used to input it into a vacuum kettle with an absolute pressure of 20Kpa to carry out flash evaporation. When the temperature of the raw material mother liquor drops to 250°C, the flash evaporation ends. The material is refined asphalt A; the softening point of the refined asphalt A is 72°C.

Embodiment 2

[0025] a. Mix the medium temperature coal pitch with a softening point of 70°C and the petroleum pitch with a softening point of 45°C according to a weight ratio of 3:2 and mix them uniformly at 200°C to obtain a mixed pitch;

[0026] b. Mix the mixed asphalt and washing oil according to the weight ratio of 1:1 and keep it at 250°C for 50min, and then centrifugally treat it for 5min under the conditions of 3000G centrifugal force and 200°C to obtain the raw material mother liquor with decontamination;

[0027] c. After the raw material mother liquor is heated to 380°C, the pump is used to input it into a vacuum kettle with an absolute pressure of 30Kpa to carry out flash evaporation. When the temperature of the raw material mother liquor is lowered to 240°C, the flash evaporation is completed. The material is refined asphalt B; the softening point of the refined asphalt B is 68°C.

Embodiment 3

[0029] a. Mix the medium temperature coal pitch with a softening point of 80°C and the petroleum pitch with a softening point of 48°C according to a weight ratio of 1:1 and mix them uniformly at 200°C to obtain a mixed pitch;

[0030] b. Mix the mixed asphalt and washing oil according to the weight ratio of 1:9 and keep it at 280°C for 60min, and then centrifugally treat it for 8min under the conditions of 4000G centrifugal force and 220°C to obtain the raw material mother liquor of decontamination;

[0031] c. after the raw material mother liquor is heated to 390 ℃, the pump is used to input it into a vacuum kettle with an absolute pressure of 40Kpa to carry out flash evaporation, when the temperature of the raw material mother liquor drops to 250 ℃, the flash evaporation ends, and the vacuum kettle bottom The material is refined asphalt C; the softening point of the refined asphalt C is 78°C.

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Abstract

The invention discloses a treatment method for mixed asphalt as a raw material for preparing needle coke. The treatment method comprises the following steps: thoroughly mixing coal pitch and petroleum asphalt below 200 DEG C to obtain mixed asphalt, wherein the weight ratio of the coal pitch to the petroleum asphalt is (1:1)-(9:1); then, mixing the mixed asphalt with wash oil according the weight ratio of (1:9)-(1:1); keeping the mixture at 220-280 DEG C for 40-60 min; centrifuging to obtain a raw material mother liquor without impurities; finally, heating the raw material mother liquor to be at 370-390 DEG C; feeding to a vacuum kettle with the absolute pressure of 20-40 Kpa for flash evaporation; after the temperature of the raw material mother liquor is reduced to 250 DEG C, ending the flash evaporation; obtaining the material at the bottom of the vacuum kettle, namely, refined asphalt. When the needle coke prepared from the refined asphalt is used for making an electrode, the electrode has the advantages of low coefficient of thermal expansion, high breaking strength and small electrical resistivity, so that the service performance of the electrode is improved.

Description

technical field [0001] The invention relates to a method for treating mixed asphalt as a raw material of needle coke, and belongs to the technical field of asphalt treatment. Background technique [0002] Needle coke can be used to manufacture high-power or ultra-high-power graphite electrodes, which have the advantages of strong thermal shock resistance, high mechanical strength, good oxidation resistance, low electrode consumption and high current density. Needle coke is obtained by coking of pitch raw materials. The current needle coke raw materials are mainly coal pitch, namely coal tar or coal tar pitch. However, it is well known that coal tar or coal tar pitch contains more quinoline insolubles and sulfur, Nitrogen and other impurities, these impurities will hinder the growth and fusion of the mesophase spheres formed by the heating of the pitch during the needle coke preparation process, which is not conducive to the formation of high-quality needle coke. [0003] In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/00C10C3/06
Inventor 任相坤崔永君王培郑李辉尹明亮丁艳
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD