燃料化学学报2016，Vol.44Issue(11)：1318-1325,8.
低温煤焦油常渣C5沥青质的分离与表征
Separation and characterization of C5-asphaltene from low temperature coal tar
摘要
Abstract
The asphaltene was obtained from the low temperature coal tar heavy fraction by solvent precipitation with three kinds of solvents; n-pentane, n-pentane with 5% ethanol and n-pentane with 5% isopropanol. The properties such as structure parameters and hetero atom distribution were analyzed by 1 H-NMR, 13 C-NMR, FT-ICR MS, elemental analysis and average molecular weight determination ( GPC ) . Some possible average molecular structures containing hetero atoms were constructed and discussed. The results show that after adding polar solvent, the yield of C5-asphaltene is significantly reduced, while the aromaticity and average molecule weight are enhanced. The average molecular structure of the C5-asphaltene exhibits shorter side-chains and higher condensation degree. Though the type of heteroatom compounds in the asphaltene is barely changed by the addition of polar solvents, the relative abundance of O3-O6 class species is increased. Meanwhile, some O1-O2 class species with low condensation degree are transferred into maltene, indicating that the mixed solvent has a larger solubility with these compounds.关键词
低温煤焦油/C5-沥青质/平均分子结构/杂原子化合物Key words
low temperature coal tar/C5-asphaltene/average molecular structure/heteroatom compound分类
化学化工引用本文复制引用
张倩玉,许志明,赵锁奇..低温煤焦油常渣C5沥青质的分离与表征[J].燃料化学学报,2016,44(11):1318-1325,8.基金项目
The project was supported by the National Basic Research Program of China (863 program,2011AA05A2024).国家重点基础研究发展计划(863计划,2011AA05A2024)资助 （863 program,2011AA05A2024）
