燃料化学学报Issue(8)：938-944,7.
煤焦油重组分沥青质性质分析及对加氢裂化生焦影响的推测
Properties of coal tar heavy fraction and its relevance to coking in hydrocracking
摘要
Abstract
The hydrogenation experiment on the heavy fraction (>350℃) of medium/low temperature coal tar, prepared by vacuum distilling, was conducted in an autoclave, and the asphaltene was separated from heavy fraction with n-heptane solvent. The properties such as structure parameters, functional group and microstructure were analyzed by 1 H-NMR, XRD, FT-IR, SEM, ultimate analysis and average molecular weight determination ( VPO) . Moreover, the relevance of coking to C7-asphaltene properties was discussed. The results show that C7-asphaltene units are mainly composed of polycyclic aromatics linked in side with a few and short aliphatic chains ( mainly n-alkane less than 3 C atoms) . The asphaltene units have small average molecular weights and there is no aromatic sheet stacking structure existing. The propensity to aggregate for asphaltene units was weakened because O atoms in asphaltene are mainly distributed in epoxyalkane or ethers ( C-O-C) and they are different from the petroleum asphaltene whose O atoms exist in the peripheral phenolic and alcoholic hydroxyl. So, the intermolecular hydrogen bond is more difficult to build. Furthermore, short chains are not easy to break and fewer polycyclic aromatic radicals are generated in the hydrocracking process, and the asphaltene has a lower coking potential.关键词
中/低温煤焦油/重组分加氢/正庚烷沥青质/结构参数/缩合生焦Key words
medium/low temperature coal tar/heavy fraction hydrogenation/C7-asphaltene/structure parameter/aggregating and coking分类
化学化工引用本文复制引用
吴乐乐,邓文安,李传,张英红,王晓杰..煤焦油重组分沥青质性质分析及对加氢裂化生焦影响的推测[J].燃料化学学报,2014,(8):938-944,7.基金项目
中国石油大学(华东)创新工程资助(YCX2014024) （华东）
中央高校基本科研业务费专项资金(14CX05032A)。 （14CX05032A）
