有机硫化合物组成特征与热稳定性研究——以约旦油页岩和页岩油为例

The Compositional Features and Thermal Stability of Organic Sulfur Compounds in Fossil Fuel—oil Shale and Shale oil From Jordan

约旦油页岩和页岩油的芳烃组分中检测到的主要有机硫化合物包括烷基四氢噻吩系列、烷基噻吩系列、烷基苯并噻吩系列、烷基二苯并噻吩系列和烷基苯并萘噻吩系列等。其中烷基四氢噻吩和烷基噻吩是两个主要系列。在油页岩中这两个系列丰度相当,而页岩油中烷基噻吩系列含量远远高于烷基四氢噻吩系列。此外,油页岩中各系列低碳数成员含量较少,且具有明显的偶碳优势;而页岩油中则特别富含低碳数成员,偶碳优势消失或明显减弱。显然,样品的热演化程度控制了有机硫化合物的组成特征。受热前后烷基四氢噻吩与烷基噻吩两系列的消长关系,说明在热演化过程中,烷基四氢噻吩会向烷基噻吩转化。

Avariety of organic sulfur compounds (OSC), including dominantly alkyl tetrahydrothiophene (thiolane) series, alkyl thiophene series, alkyl benzothiophene series, alkyl dibenzothiophene series and alkyl benzonaphthothiophene series, have been identified in aromatic fractions of oil shale and shale oil from Jordan. Compared with their compositional features, it is found that alkyl thiolane series and alkyl thiophene series are predominant in OSC of the samples. However, the abandance of two series in oil shale is similar, while alkyl thiolane series much less than alkyl thiophene series in shale oil. In addition, the content of the lower carbon components is lower and even carbon preference obvious in oil shale (CPI<1 ); on the contrary, shale oil contains a great deal of lower molecular OSC and even carbon preference disappears or decreases. Obviously, the compositional features of OSC depend on the thermal maturation of samples. The content of alkyl thiolane series decreases and alkyl thiophene series increa with the increase of maturity. It shows that the thermal stability of the former is less than the latter.