文献类型：期刊文献

英文题名：Original preasphaltenes and asphaltenes in coals

作者：Chen, Chong[1]; Gao, Jin-Sheng[1]; Yan, Yong-Jie[1]

机构：[1]E China Univ Chem Technol, Dept Chem Engn Energy Resource, Shanghai 200237, Peoples R China

年份：1998

卷号：55

期号：2

起止页码：143

外文期刊名：FUEL PROCESSING TECHNOLOGY

收录：;EI(收录号：1998364289154);WOS:【SCI-EXPANDED(收录号:WOS:000074289300005)】；

语种：英文

外文关键词：coal; preasphaltene; asphaltene; hydrogen bond

摘要：The preasphaltene (PA) and asphaltene (A) fractions from untreated coal show a direct relationship of PA/A (w/w) to the carbon content of coal. Their thermal stability was investigated by in-situ pyrolysis FTIR, and the results show that PA has higher thermal stability than A. By means of a vacuum FTIR method, five types of hydrogen bonds formed by hydroxyl groups were clearly observed in PA and A, i.e., OH-pi, self-associated OH, OH-ether oxygen, cyclic OH groups, and OH-N. The self-associated OH and OH-ether oxygen are the two main hydrogen bonds. The insolubility of PA in benzene and A in hexane is determined by the hydrogen bond strengths of the acid/base fraction but is not strongly related to their structural parameters and molecular weight. The acid/base associated strength of preasphaltenes and asphaltenes is estimated to be within the following ranges, asphaltenes, < 5.15 kJ/mol; preasphaltenes, 5.15-30.9 kJ/mol. (C) 1998 Elsevier Science B.V. All rights reserved.