Analysis of medium temperature coal tar pitch group composition and its effect on the structure of mesophase pitch

DING Bu-xi; ZHONG Mei; MA Feng-yun

doi:10.19906/j.cnki.JFCT.2022004

Volume 50 Issue 7

Aug. 2022

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DING Bu-xi, ZHONG Mei, MA Feng-yun. Analysis of medium temperature coal tar pitch group composition and its effect on the structure of mesophase pitch[J]. Journal of Fuel Chemistry and Technology, 2022, 50(7): 920-926. doi: 10.19906/j.cnki.JFCT.2022004

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DING Bu-xi, ZHONG Mei, MA Feng-yun. Analysis of medium temperature coal tar pitch group composition and its effect on the structure of mesophase pitch[J]. Journal of Fuel Chemistry and Technology, 2022, 50(7): 920-926. doi: 10.19906/j.cnki.JFCT.2022004

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Analysis of medium temperature coal tar pitch group composition and its effect on the structure of mesophase pitch

doi: 10.19906/j.cnki.JFCT.2022004

School of Chemical Engineering and Technology, Xinjiang University, State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Key Laboratory of Coal Clean Conversion & Chemical Engineering Process (Xinjiang Uygur Autonomous Region), Urumqi 830046

Funds: The project was supported by the National Nature Science Foundation of China (21766035), Xinjiang Uygur Autonomous Region Outstanding Youth Fund (2020Q001), Shanghai Cooperation Organization Science and Technology Partnership Program and International Science and Technology Cooperation Program (2020E01018), Xinjiang Uygur Autonomous Region Key Laboratory Open Project (2018D04008).

Received Date: 2021-11-29
Accepted Date: 2022-01-11
Rev Recd Date: 2021-12-26

Available Online: 2022-01-22

Publish Date: 2022-08-01

Abstract

Abstract

Medium temperature coal tar pitch (ZCTP) was separated by Soxhlet extraction using toluene-pyridine and n-heptane-tetrahydrofuran as solvents to obtain the group components. Then, their composition and structure were analyzed. The results show that, in comparison with ZCTP, toluene-insoluble pyridine soluble (TI-PS) and n-heptane-insoluble tetrahydrofuran soluble (HI-THFS) are more thermally stable, exhibiting a decrease weight loss of 41.51% and 28.85% and an increase residual carbon rate of 56.95% and 47.63%, respectively. In addition, the C=C contents of TI-PS and HI-THFS are 6.69% and 3.26% higher than that of ZTCP, reaching 75.57% and 73.14%, and the pyridine nitrogen contents of TI-PS and HI-THFS increase about 16 and 8 percentage points. Both TI-PS and HI-THFS were used to prepare mesophase pitch. It is found that M-HI-THFS is mainly consisted of small and medium area type with some fine mosaic structure and low optical anisotropy content. While M-TI-PS has about 80% optical anisotropy content and displays a wide range of optical weave. However, it is difficult for ZCTP to form a stable regional optical fabric structure, just exhibiting a mosaic optical fabric.
- medium temperature coal tar pitch,
- Soxhlet extraction,
- group component,
- co-carbonization,
- mesophase pitch

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References(29)

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