摘要
用~1H-NMR和^(13)C-NMR对超临界甲苯抽出物的芳香段分予以表征,结果表明,各芳香段分具有背缩芳核、联苯、芴、9,10-二氢蒽和二苯亚甲基及对应杂原子取代型开链结构。油段分的平均分子中含有约两个芳环,沥青质段分中含有3—8个,苯不溶部分含5—11个。油段分芳环上烷基的取代度为30%—49%,沥青质的段分为26%—35%,前沥青质的段分为22%—31%。在油段分中含有四氢萘结构,有些段分的结构中具有长烷基取代。
The extract, accounting for 23% of the maf coal, was obtained by supercritical gas extraction cf Fushun bituminous coal with toluene at 350℃ and 20 MPa using a semi-continous apparatus. It was separated into three fractions, oil, asphaltene and pre-asphaltene, by the solvent extraction with heptane, benzene and tetrahydrofuran, respectively. Each fraction was further separated into subfractions by ion exchange resins and silica gel chromatography. With the separation scheme used, the extract can be separated into more detailed subfractions with high recovely, thus, more accuratestructural information of extract was derived through analysis of each subtraction.GC and GC/MS analyses of F_1(H-heptane) of oil reveal the presence of n-alkance(C_(13)-C_(31)), isoprenoids and the series of long chain alkyl benzene. n-Alkanes are the main components of F_1(n-heptane), the odd-over-even predominance of n-alkanes was found. These compounds may provide useful geochemical information of Fushun bituminous coal.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1990年第4期357-364,共8页
Journal of Fuel Chemistry and Technology
基金
中国科学院基金
关键词
煤
超临界萃取
背缩芳核
结构
bituminous coal
supercritical gas extraction
extract
separation
analysis
