沙特轻质原油常压渣油中含氮化合物的表征

摘要

采用正、负离子模式下的电喷雾电离源(ESI)傅里叶变换离子回旋共振质谱(FT-ICR MS)研究沙特轻质原油常压渣油中所含的含氮化合物.从分子水平检测碱性和非碱性含氮化合物在沙特轻质原油常压渣油中的分布.结果表明:相对丰度最高的碱性和非碱性化合物类型均为含一个氮原子的N1类化合物;非碱性的N1类化合物主要是以吡咯环为中心官能团的化合物,苯并卡唑和二苯并咔唑类化合物含量最高;碱性的N1类化合物主要是以吡啶氮为中心官能团的化合物,其类型分布相对非碱性N1类化合物更加均匀.%The molecular structures of nitrogen-containing compounds in the atmospheric residue form Arabian light crude was determined by electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS).The ESI FT-ICR analysis indicates that the highest relative abundance of basic and neutral compounds is N1 class species.The neutral N1 class species are functional groups centered on pyrrde ring.Among of them,benzocarbazole and dibenzocarbazole is predominant.The basic N1 nitrogen compounds are functional groups of pyridine derivative compounds.Compared with the neutral N1 class species,the distribution of basic nitrogen compounds is more uniform.