A solvent for preparing high-quality coal-based needle coke, its preparation method and its application

A needle coke and solvent technology, applied in coking ovens, coking carbonaceous materials, tar processing through distillation, etc., can solve the problem of coal-based needle coke raw materials with low QS-TI and QI content, coal-based needle coke raw materials Problems such as high QI content and high production cost of coal-based needle coke achieve the effects of environmental protection, easy separation, and reduced production cost

Active Publication Date: 2020-04-07
SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the difficulty in recycling existing solvents used to prepare coal-based needle coke, which leads to high production costs of coal-based needle coke and the QI in the prepared coal-based needle coke raw material The problem of high content, so as to provide a solvent for the preparation of high-quality coal-based needle coke, which has low recovery energy consumption and high recovery rate, and the content of QS-TI and QI in the prepared coal-based needle coke raw materials low; at the same time, the present invention also provides a method for preparing the solvent from the by-products produced during the production of needle coke from medium and low temperature coal tar; in addition, the present invention also provides the application of the solvent

Method used

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  • A solvent for preparing high-quality coal-based needle coke, its preparation method and its application
  • A solvent for preparing high-quality coal-based needle coke, its preparation method and its application
  • A solvent for preparing high-quality coal-based needle coke, its preparation method and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mix medium and low temperature coal tar and coker oil gas, preheat it and send it to the first fractionation tower, and fractionate to obtain the top oil gas, the first line distillate (150-270°C), the second line distillate (270-360°C) ℃), coal tar pitch, and collect the distillate oil of the first measuring line to obtain the aromatic solvent. Mix the oil gas at the top of the first fractionation tower with the second line distillate (270-360°C), preheat and send it to the hydrogenation reactor, set the temperature at 320°C, and the pressure at 14MPa. The mixture of oil gas and second line distillate oil is subjected to hydrotreating, and the product obtained after hydrotreating is sent to the second fractionating tower, and the distillate oil at 130-310°C obtained by fractional distillation is an aliphatic solvent. The above-mentioned aromatic solvent and aliphatic solvent are mixed online according to a mass ratio of 7:3 to obtain a solvent for preparing coal-based ...

Embodiment 2

[0031]Mix medium and low temperature coal tar and coker oil gas, preheat it and send it to the first fractionation tower, and fractionate to obtain the top oil gas, the first line distillate (150-270°C), the second line distillate (270-360°C) ℃), coal tar pitch, and collect the distillate oil of the first measuring line to obtain the aromatic solvent. Mix the oil gas at the top of the first fractionation tower with the second line distillate (270-360°C), preheat and send it to the hydrogenation reactor, set the temperature at 250°C, and the pressure at 15MPa. The mixture of oil gas and second line distillate oil is subjected to hydrotreating, and the product obtained after hydrotreating is sent to the second fractionating tower, and the distillate oil at 130-310°C obtained by fractional distillation is an aliphatic solvent. The above-mentioned aromatic solvent and aliphatic solvent are mixed online according to a mass ratio of 6:4 to obtain a solvent for preparing coal-based n...

Embodiment 3

[0034] Mix medium and low temperature coal tar and coker oil gas, preheat it and send it to the first fractionation tower, and fractionate to obtain the top oil gas, the first line distillate (150-270°C), the second line distillate (270-360°C) ℃), coal tar pitch, and collect the distillate oil of the first measuring line to obtain the aromatic solvent. Mix the oil gas at the top of the first fractionation tower with the second line distillate (270-360°C), preheat and send it to the hydrogenation reactor, set the temperature at 390°C, and the pressure at 12MPa. The mixture of oil gas and second line distillate oil is subjected to hydrotreating, and the product obtained after hydrotreating is sent to the second fractionating tower, and the distillate oil at 130-310°C obtained by fractional distillation is an aliphatic solvent. Stir and mix the above aromatic solvent and aliphatic solvent in a tank at a mass ratio of 5:5 to obtain a solvent for preparing coal-based needle coke. ...

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Abstract

The invention belongs to the technical field of preparation of needle coke and discloses a solvent for preparing a high-quality coal-based needle coke, a preparation method and an application thereof.The solvent has an initial boiling point of not less than 130 DEG C at a normal pressure, a distillation quantity before 200 DEG C of not less than 45% (w / w), the distillation quantity before 300 DEGC of not less than 95% (w / w), a BMCI (Bureau Of Mines Correlation Index) value of 70-80 and a density of 0.86-0.92 g / cm<3>. Since the solvent contains a lot of light fractions with the temperature ofnot greater than 200 DEG C; compared with a solvent containing a lot of heavy fractions, the solvent in the invention is relatively low in density (0.86-0.92 g / cm<3>; a light phase formed by mixing the solvent and coal-tar asphalt is easily separated from a heavy phase; since the solvent contains a lot of light fractions, the solvent is separated more easily during reduced pressure distillation;the recycling energy consumption of the solvent is reduced, the recycling rate of the solvent is improved, the production cost of the needle coke is reduced, and meanwhile environmental protection isbenefited.

Description

technical field [0001] The invention belongs to the technical field of needle coke preparation, and in particular relates to a solvent for preparing high-quality coal-based needle coke, a preparation method and an application thereof. Background technique [0002] Needle coke is a high-quality carbon material. It is named for its elongated needle-like structure after crushing. It has good orientation, strong electrical and thermal conductivity, and is the main raw material for manufacturing advanced graphite electrodes. It is produced with needle coke The ultra-high power graphite electrode has the advantages of low resistivity, high bulk density, high mechanical strength, small thermal expansion coefficient, and good thermal shock resistance. Needle coke graphitized products are widely used in electric furnace steelmaking electrodes, nuclear reactor deceleration materials and rocket technology and other fields. [0003] The needle coke currently produced can be divided int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B55/00C10C1/04
CPCC10B55/00C10C1/04
Inventor 赵宁李秀辉毛世强吕子胜王彦军述子清王雄雄刘宁姬锐刘伟赵修洪
Owner SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
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