基于非均相成核理论开展的煤沥青净化研究

孟雨辰; 马兆昆; 曹瑞雄; 宋怀河

基于非均相成核理论开展的煤沥青净化研究

1.
北京化工大学材料科学与工程学院, 北京 100029;
2.
北京化工大学常州先进材料研究院, 江苏常州 213164

基金项目: 国家自然科学基金（51872018，U1610252）.

详细信息

作者简介:
孟雨辰,硕士研究生.E-mail:791014622@qq.com

通讯作者:
马兆昆,副教授,博士.E-mail:mazk@mail.buct.edu.cn

中图分类号: TQ127.1⁺1
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出版历程
- 收稿日期: 2019-11-25
- 录用日期: 2020-04-02
- 修回日期: 2020-01-18
- 刊出日期: 2020-02-29

Purification of coal tar pitch by a combined thermal condensation and filtration method

1.
College of Materials Science and Engineering, Beijing University of Chemcial Technology, Beijing 100029, China;
2.
Beijing University of Chemcial Technology, Changzhou Institute of Advanced Materials, Changzhou 213164, China

Funds: National Natural Science Foundation of China (51872018,U1610252).

摘要

摘要: 中间相沥青常用作高端炭材料的前驱体，因此其沥青原料应具有较低的灰分。本研究以中温煤沥青为原料，结合非均相成核理论，先热缩聚生成中间相微球，再过滤除去微球和其表面负载的喹啉不溶物的方法获得精制沥青。考察了热缩聚时间和滤材孔径对精制沥青灰分和收率的影响，并运用SEM对滤渣微观形貌进行观察，探究了此方法的脱灰机理。结果表明，热缩聚温度和滤材孔径对脱灰效果影响很大：当热缩聚温度一定时，随着热缩聚时间的增长，获得精制沥青的灰分先下降后趋于稳定，而收率持续下降；当热缩聚时间一定时，精制沥青灰分和收率会随着滤材孔径的减小而降低。使用此净化方法可以得到灰分低至9×10^-5的精制沥青，能够满足多种高端炭材料原料的要求。
- 煤沥青 /
- 非均相成核 /
- 中间相小球 /
- 灰分
Abstract: Raw coal tar pitch with an ash content of 1100 ppm and a quinolone insoluble (QI) fraction of 8 wt% was first thermally condensed at 420℃ for different times, then dissolved in pyridine at 100℃ for 1 h under stirring and finally filtered under a pressure of 0.1-0.3 MPa with meshes of different sizes to lower the ash and QI contents. The effects of the thermal condensation time and aperture size of the mesh on the purification efficiency were investigated. Results indicated that the ash content of the refined pitch first decreased and then increased slightly, but the pitch yield decreased with condensation time. The ash content and yield of refined pitch decreased with decreasing the aperture size. The purification efficiency was improved greatly by thermal condensation. SEM observation of the surface morphology of the residue revealed that mesophase spheres formed by heterogeneous nucleation during the thermal condensation had the ability to adsorb ash components and primary QI to decrease their contents in the refined pitch. The slight increase of the ash content with a condensation time greater than 5 h was caused by coalescence of mesophase spheres to form large spheres and domains, which decreased their adsorbing ability. A refined pitch with an ash content of 90 ppm and a QI content of 0.6 wt% was obtained using a condensation time of 5 h and a mesh aperture size of 13 μm, which meets the requirement for preparing most advanced carbon materials.
- Coal tar pitch /
- Heterogeneous nucleation /
- Mesophase sphere /
- Ash content

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