摘要：
The selective oxidation method with tetrabutylammonium periodate, separation-X ray fluorescence spectrometry, and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) techniques were used to elucidate the types and distributions of sulfur compounds (thioether, thiophene, DBT, and more complex benzothiophene compounds) in Middle East vacuum gas oil (VGO) and in its 9 fractions before and after hydrotreatment.The results show that sulfidic sulfur accounts for 13.6% of the total sulfur in the VGO, the others are all thiophenic compounds.With increasing boiling point of the fractions, the contents of total sulfur, sulfidic sulfur, thiophenic sulfur and more complex compounds sulfur increase gradually, while the proportion of sulfidic sulfur in the total sulfur of the fractions increases.The alkylthiophenic sulfur, concentrated in lower boiling fractions and the alkylbenzothiophene sulfur decrease as the fraction becomes heavier.Total sulfur content in the VGO is greatly reduced after hydrotreating, the proportions of sulfidic sulfur and benzothiophenic sulfur decrease, while the proportion of more complex sulfur compounds increases.With the increase of hydrotreating depth, the proportions of sulfidic sulfur and alkylthiophenic sulfur decrease gradually and the sulfur content in complex sulfur compounds increases gradually.%考察了中东VGO及其9个馏分的各类型硫化物分布规律,对比了加氢前后VGO中硫形态的分布变化.采用四丁基高碘酸铵选择性氧化法、柱分离-X射线荧光光谱法,并利用傅里叶变换离子回旋共振质谱仪(FT-ICR MS)分析了中东VGO不同馏分段的硫醚硫、噻吩硫、二苯并噻吩及更复杂的苯并噻吩类硫化物的分布规律.结果表明:中东VGO中硫醚硫约占总硫的13.6%,其它均为噻吩类硫化物;随着馏分沸点升高,各馏分总硫含量、硫醚硫含量、噻吩硫含量均呈增加趋势,硫醚硫在各馏分总硫中的比例逐渐升高;在噻吩硫中,烷基噻吩类硫含量下降,且主要集中在蜡油低沸点馏分中,烷基苯并噻吩类硫含量逐渐下降,其它更复杂含硫化合物硫含量随着馏分沸点的升高而增加;加氢处理后总硫含量大幅度降低,硫醚硫、苯并噻吩类硫含量的比例降低,其它更复杂含硫化合物硫含量的比例增加;随着加氢深度增加,硫醚硫、烷基噻吩硫含量的比例逐渐降低,其它更复杂含硫化合物硫含量的比例逐渐增加.
