文献类型：期刊文献

英文题名：Effect of solvent quality on covalent bonds cleavage behaviors of lignite during pyrolysis/liquefaction processes

作者：Huang, Sheng[1];Cao, Song[1];Zhang, Yuanlin[1];Wu, Shiyong[1,2];Wu, Youqing[1];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：2023

卷号：109

外文期刊名：JOURNAL OF THE ENERGY INSTITUTE

收录：;EI(收录号：20232314189982);WOS:【SCI-EXPANDED(收录号:WOS:001015862100001)】；

基金：Acknowledgements We gratefully acknowledge financial support of this work by the National Key R & D Program of China (Grant No. 2022YFB4101300) , National Natural Science Foundation of China (21978091) , and State Key Laboratory of High -efficiency Utilization of Coal and Green Chem- ical Engineering (Grant No. 2022-K02) .

语种：英文

外文关键词：Solvent quality; Product distribution; Covalent bonds; Bond cleavage behaviors

摘要：Effect of solvent quality on coal conversion and product distribution during lignite pyrolysis/liquefaction were investigated at the temperatures ranging from 180 to 460 degrees C, and the covalent bond cleavage behaviors in different solvents were comparatively elucidated. Results showed that at the temperatures below 280 degrees C, weak covalent bonds, such as methoxy and carboxyl groups, are cleaved to generate a small amount of gaseous products (mainly CO2) and liquefied oil. At the temperatures of 330-380 degrees C, ether bridges that connecting the aromatic clusters are cleaved and contributed significantly to the production of preasphaltene (PA). Meanwhile, oil yield and coal conversion increased to 27.50% and 64.58% in tetralin. At the temperatures of 430-460 degrees C, the cleavage of CH2 bridges, alkyl substituent groups and aromatic heterocyclic structures proceeded markedly, and the scission of CH2 bridges and some naphthenic CH2 bonds significantly contributed to oil production. Consequently, oil yield and coal conversion greatly increased to 43.90% and 84.13% in tetralin. Hydrogen donor solvent is conducive to the cleavage of strong covalent bonds, such as Car-O-Car and Car-Cal bonds, to realize the efficient liquefaction of coal.