建立了气相色谱-飞行时间质谱表征馏分油芳烃分子组成馏程分布的分析方法。以不同环数芳烃标样的“沸点-色谱保留时间”关系曲线为芳烃试样色谱图馏分切割的依据，利用此方法表征了试样Y中芳烃的分子组成、平均相对分子质量和平均结构的馏程分布。实验结果表明，各馏分段中芳烃的平均相对分子质量与此馏分段的温度呈良好的线性关系，相关系数为0.9954，可由此预测芳烃试样在任意馏分段的平均相对分子质量；在相同馏分段中，芳烃不饱和度越高，平均碳数和平均相对分子质量越小，侧链碳率越低。该方法开拓了分子水平表征石油及其产品的新思路。%A method for the analysis of distillation range distribution of aromatic hydrocarbon molecular composition in distillate oil by gas chromatography-time of fl ight mass spectrometry was established. The chromatogram of the aromatic was divided into diff erent distillation ranges according to the fi tting curve of“boiling point-GC retention time”. The distillation range distributions of the molecular compositions, average molecular weights and average molecular structures of sample Y were characterized. The results showed that,the average molecular weights of the every fraction were linear with the distillation temperature and the correlation coeffi cient was 0.995 4,which made the prediction of the average relative molecular weight of every distillation fraction possible. It was found that,in the same distillation fraction,the higher the unsaturation degree,the lower the average molecular weight and the average carbon number,and the shorter the side chains. The method can characterize petroleum and its products in molecular level.
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