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Process for preparing needle coke from medium-low temperature coal tar pitch by four-stage variable-temperature refining one-step method

A technology for low-temperature coal tar and kerosene pitch, which is used in the processing of tar pitch/petroleum pitch/natural pitch, processing tar pitch/petroleum pitch/natural pitch by distillation, and tar processing by distillation, etc. The problems of blending and heat-reactive substances are difficult to remove, so as to achieve the effects of uniform blending ratio, low production cost and good blending effect.

Active Publication Date: 2020-09-01
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned existing problems that it is difficult to remove substances with high thermal reactivity and difficult to reconcile the components when preparing coal-based needle coke with medium-low temperature coal tar, the present invention proposes a fourth-order variable temperature refining step of medium-low temperature coal tar pitch Preparation of needle coke technology, its specific technical scheme is as follows:

Method used

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  • Process for preparing needle coke from medium-low temperature coal tar pitch by four-stage variable-temperature refining one-step method
  • Process for preparing needle coke from medium-low temperature coal tar pitch by four-stage variable-temperature refining one-step method
  • Process for preparing needle coke from medium-low temperature coal tar pitch by four-stage variable-temperature refining one-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Put 2kg of medium and low temperature coal tar in the rectification reaction kettle, carry out vacuum distillation, distill out the medium and low temperature kerosene pitch in the fraction of 400-480°C, take 100g of medium and low temperature kerosene pitch for crushing; give the crushed Add a blending agent of 400wt% of the medium and low temperature kerosene pitch to the medium and low temperature kerosene pitch to reconcile the components of the medium and low temperature kerosene pitch; raise the temperature to 60°C; then raise the temperature to 100°C, stand at constant temperature for 5 hours, extract and enrich the raw material aromatics, Discharge the macromolecular impurities insoluble in the extractant from the bottom of the reaction kettle; add a modifier, the amount of the modifier added is 0.2%wt of the weight of the medium and low temperature kerosene pitch, continue to heat up to 150 ° C, keep it at a constant temperature for 4 hours, use The modifier rea...

Embodiment 2

[0055] Put 2kg of medium and low temperature coal tar in the rectification reaction kettle, carry out vacuum distillation, distill out the medium and low temperature kerosene pitch in the fraction of 400-480°C, take 100g of medium and low temperature kerosene pitch for crushing; give the crushed Add a blending agent of 300wt% of the medium and low temperature kerosene pitch to the medium and low temperature kerosene pitch to adjust the composition of the medium and low temperature kerosene pitch; raise the temperature to 60°C; then raise the temperature to 100°C, stand at constant temperature for 5 hours, extract and enrich the raw material aromatics, Discharge the macromolecular impurities insoluble in the extractant from the bottom of the reaction kettle; add a modifier, the amount of the modifier added is 0.2%wt of the weight of the medium and low temperature kerosene pitch, continue to heat up to 150 ° C, keep it at a constant temperature for 4 hours, use The modifier react...

Embodiment 3

[0058] Put 2 kg of medium and low temperature coal tar in the rectification reactor, carry out vacuum distillation, distill out the medium and low temperature kerosene pitch in the 360-480°C fraction, take 100g of medium and low temperature kerosene pitch for crushing; give the crushed Add a blending agent of 400wt% of the medium and low temperature kerosene pitch to the medium and low temperature kerosene pitch to reconcile the components of the medium and low temperature kerosene pitch; raise the temperature to 50°C; then raise the temperature to 120°C, stand at constant temperature for 8 hours, extract and enrich the raw material aromatics, The macromolecular impurities insoluble in the extractant are discharged from the bottom of the reaction kettle; the modifier is added in an amount of 0.3%wt of the weight of the medium and low temperature kerosene asphalt, and the temperature is continued to rise to 160°C, and the temperature is kept for 8 hours. The modifier reacts with...

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Abstract

The invention provides a process for preparing needle coke from medium-low temperature coal tar pitch by a four-stage variable temperature refining one-step method and belongs to the technical field of needle coke preparation. The process specifically comprises the following steps of: (1) performing medium-low temperature coal tar fraction distilling; (2) carrying out four-stage variable-temperature refining to obtain refined raw material maltha; (3) carrying out a thermal polymerization reaction to prepare semicoke; and (3) performing calcining, and performing cooling to room temperature to obtain the needle coke. The needle coke prepared by the preparation method of the needle coke is high in yield, stable in yield and high in quality.

Description

technical field [0001] The invention belongs to the technical field of needle coke preparation, in particular to a process for preparing needle coke by a four-stage temperature-variable refining one-step method of middle and low temperature coal tar pitch. Background technique [0002] Coal tar is one of the main products of coal thermal processing and is a multi-component mixture. According to the different coal thermal processing processes, the obtained coal tar is usually divided into low-temperature coal tar, medium-temperature coal tar and high-temperature coal tar. [0003] Medium-temperature coal tar and low-temperature coal tar are referred to as medium-low temperature coal tar for short, which are rich in 3-5 ring aromatic compounds, have suitable molecular weight, and extremely low quinoline tolerance (QI), which is a high-quality raw material source for the preparation of coal-based needle coke. However, there are also some unfavorable factors for coke formation,...

Claims

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Application Information

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IPC IPC(8): C10B55/00C10C3/00C10C3/08C10C3/02C10C3/06C10C1/16
CPCC10B55/00C10C1/16C10C3/005C10C3/026C10C3/06C10C3/08
Inventor 李冬刘杰田育成黄晔崔楼伟田亚飞高峰郑金欣淡勇李稳宏
Owner NORTHWEST UNIV
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