文献类型：期刊文献

英文题名：Effective preparation of mesophase by segmented hydrogenation/thermal polycondensation of coal liquefied pitch

作者：Qi, Mengyao[1];Huang, Sheng[1];Wu, Shiyong[1,2];Wu, Youqing[1];Bai, Yonghui[2];Gao, Jinsheng[1]

机构：[1]East China Univ Sci & Technol, Dept Chem Engn Energy Resources, Shanghai 200237, Peoples R China;[2]Ningxia Univ, State Key Lab High efficiency Utilizat Coal & Gree, Yinchuan 750021, Peoples R China

年份：2022

卷号：324

外文期刊名：FUEL

收录：;EI(收录号：20222212184646);WOS:【SCI-EXPANDED(收录号:WOS:000809866800004)】；

基金：Acknowledgements We gratefully acknowledge financial support of this work by the National Natural Science Foundation of China (Grant Nos. 21878096 and 2197080732) and State Key Laboratory of High-efficiency Utiliza-tion of Coal and Green Chemical Engineering (Grant No. 2022-K02) .

语种：英文

外文关键词：Coal liquefied pitch; Hydrogenation modification; Mesophase pitch; Optical texture

摘要：Mesophase pitches were prepared by segmental hydrogenation/thermal condensation using Shenhua coal liquefaction residue refined pitch (CLP) as raw material, and the effects of tetralin (THN) addition (5 ~ 15 wt%) and hydrogenation temperature (350 ~ 450 ?C) on the structure and properties of the resulting products were investigated. The results showed that the H/C atomic ratio of the hydrogenated pitch (HP-12.5%) reached 0.64 at the temperature of 400 ?C and THN addition of 12.5 %, and the content of the generated mesophase reached 76.0 % after heat treatment, which increased by 33.5 % compared with the mesophase content without hydrogenation. And the optical texture of the mesophase was improved from mosaic type to coarse fiber type and coarse flake type. The structures of the hydrogenated pitches were characterized by H-1 NMR and FT-IR, which showed that the addition of THN increased the alkyl groups of the hydrogenated pitch molecules and resulted in more alpha-structures. The X-ray diffraction results showed a better orientation arrangement of pitch aromatic planar molecules due to enhanced fluidity of pitches caused by the increased alkyl structure after the addition of THN.