关键词: 催化裂化轻循环油（LCO）, 芳烃；类型分布；全二维气相色谱；高分辨飞行时间质谱

Abstract: Comprehensive two-dimensional gas chromatography coupled with high resolution time of flight mass spectrometry (GC×GC/HR-TOF MS) was employed for the characterization of aromatics in light cycle oil (LCO). Identification of aromatic hydrocarbons was carried out by mass spectrum analysis, through comparing with boiling point information and retention time of standard reference materials. High resolution of GC×GC/HR-TOF MS was also used for the above aromatics identification. The main types of aromatics and their chemical structures in LCO were determined. The content of aromatics that had the same Z value but different types, can be obtained by normalized peak areas and hydrocarbon types data which was provided by the SH/T 0606—2005 method. Experimental results show that the aromatics in the LCO include alkylbenzenes (Z=-6), naphthalenes (Z=-12), anthracenes and phenanthrenes (Z=-18). Besides the above aromatics, it was also identified indans and tetralins (Z value of -8), in which indanes are dominant; indenes and a small amount of dinaphthenebenzenes (Z value of -10); biphenyls and acenaphthenes (Z value of -14), in which acenaphthenes are dominant; and fluorenes (Z value of -16). Acenaphthylenes were not detected in the LCO. The developed method can provide detailed information of aromatic types and the molecular composition of monomer compound.

Key words: light cycle oil(LCO), aromatics, type distribution, comprehensive two-dimensional gas chromatography, high resolution time of flight mass spectrometry