白石湖煤THF萃取物中硫、氮化合物赋存形态

Molecular characterization of sulfur and nitrogen compounds in THF extract of Baishihu lignite

摘要: 采用四氢呋喃（THF）对白石湖煤进行索氏萃取，萃取液在四氟硼酸银存在下与碘甲烷反应，转化成甲基磺酸盐。采用电喷雾电离（ESI）傅里叶变换离子回旋共振质谱（FT-ICR MS）对甲基硫盐和含氮化合物进行了表征，结合硫、氮化学发光检测器（GC-SCD和GC-NCD）分析，研究THF萃取物中硫、氮化合物形态。结果表明，THF萃取物中主要是S₁、S₂、N₁、N₁O₁类化合物，含量较高的硫、氮化合物分别是二苯并噻吩类化合物及咔唑类化合物。

Abstract: Baishihu lignite was subjected to Soxhlet extraction by tetrahydrofuran (THF). The extract was reacted with iodomethane in the presence of silver tetrafluoroborate and converted to methylsulfonium salts. The methylsulfonium salts and nitrogen compounds were characterized by electrospray ionization (ESI) and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Combined with sulfur and nitrogen chemiluminescence detectors (GC-SCD and GC-NCD), the forms of sulfur and nitrogen compounds in THF extracts were studied. The results showed that S₁, S₂, N₁ and N₁O₁ class species were identified in THF extract. The sulfur and nitrogen compounds were mostly dibenzothiophene and carbazole compounds.