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Production method of coal pitch

A technology of coal tar pitch and medium temperature, which is applied in the field of preparation of high softening point coal tar pitch, can solve the problems of affecting cost and low yield, and achieves the effects of convenient operation, simple equipment and simplified process route.

Active Publication Date: 2014-01-15
SHANDONG CHENYANG NEW CARBON MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the yield is low, which affects the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 1000kg of medium-temperature coal tar pitch (softening point: 80°C; quinoline insoluble content: 0.2%; coking value: 48%; toluene insoluble content: 15%; ash content: 0.2%) directly into the stirring reactor, at 10L / min Continuously feed air at a speed of 1.5°C / min, heat up to 200°C, hold for 0.5h, then raise the temperature to 330°C at 10°C / min, and hold for 20h to obtain high softening point coal tar pitch. The yield was 73.9%. The obtained coal tar pitch with a high softening point meets the following criteria: the softening point is 260°C, the coking value is 75.2%, the quinoline insoluble matter is 25.7%, the toluene insoluble matter is 50.2%, and the ash content is 0.04%.

Embodiment 2

[0027] Add 1000kg of medium-temperature coal tar pitch (softening point: 82°C; quinoline insoluble matter: 0.15%; coking value: 50%; toluene insoluble matter: 17%; ash content: 0.17%) directly into the stirring reactor, at 20L / min Continuously feed the mixed gas of nitrogen and oxygen with a volume ratio of 8:2, heat up to 202°C at 1.7°C / min, keep it for 1 hour, then raise the temperature to 332°C at 8°C / min, hold it for 15 hours, then High softening point coal tar pitch. The yield was 85.1%. The obtained coal tar pitch with a high softening point meets the following criteria: the softening point is 265°C, the coking value is 75.7%, the quinoline insoluble matter is 27.1%, the toluene insoluble matter is 52.7%, and the ash content is 0.02%.

Embodiment 3

[0029] Add 1000kg of medium-temperature coal tar pitch (softening point: 85°C; quinoline insoluble content: 0.15%; coking value: 52%; toluene insoluble content: 17%; ash content: 0.18%) directly into the stirring reactor, at 17L / min Continuously feed the mixed gas of air and nitrogen with a volume ratio of 9:1, heat up to 205°C at 2°C / min, keep it for 1 hour, then raise the temperature to 335°C at 6°C / min, hold it for 12 hours, then High softening point coal tar pitch. The yield was 92.2%. The obtained coal tar pitch with a high softening point meets the following criteria: the softening point is 270°C, the coking value is 82.6%, the quinoline insoluble matter is 30.1%, the toluene insoluble matter is 83.2%, and the ash content is 0.01%.

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Abstract

The invention relates to a production method of coal pitch, which comprises the steps of: adding mesothermal coal pitch into an agitating reaction kettle; continuously introducing air, air-nitrogen mixed gas or nitrogen-oxygen mixed gas; heating to 200-210 DEG C at 15-25 DEG C / min; preserving temperature for 0.5-1.5 hours; then, raising the temperature to 330-340 DEG C at 5-10 DEG C / min; and preserving temperature for 1-20 hours to obtain high softening point coal pitch. In the process, the mesothermal coal pitch is taken as a raw material and directly added into the kettle to react, so that processes such as premix of raw material and distillation of pitch are canceled, the process line is simplified, the yield is improved, and the purpose of low energy consumption is realized. Coal pitch with high coking value and high softening point is obtained. The preparation method provided by the invention has the advantages of convenience in operation, simpleness in process and device, low energy consumption, low cost, and the like.

Description

technical field [0001] The invention relates to a preparation method of coal chemical pitch, in particular to a preparation method of high softening point coal pitch. Background technique [0002] Softening point is one of the main performance indicators of coal tar pitch binder, especially for coal tar pitch binder used in electric furnace, converter steelmaking and high temperature calcination equipment, the softening point of coal tar pitch is required to be as high as 230-280 At the same time, coal tar pitch is also required to have high slag resistance, oxidation resistance, and thermal shock resistance, otherwise it will directly affect the service life of converters and electric furnaces, which cannot be achieved by ordinary medium-temperature and high-temperature coal tar pitch. Most of the existing coal tar pitch binders are produced through the oxidative polycondensation of mesophase pitch, using special technology and equipment, but the needle coke production te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10C3/04
Inventor 闫桂林刘春龙韩波刘越李洪岩
Owner SHANDONG CHENYANG NEW CARBON MATERIALS
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