全二维气相色谱测定汽油馏分中芳烃详细组成

Determination of Individual Aromatic Components in Gasoline Fraction by Comprehensive Two-Dimensional Gas Chromatography

采用全二维气相色谱-氢火焰离子化检测器(GC×GC-FID)对汽油中芳烃组分特别是C_(9+)芳烃进行了详细的定性和定量分析。全二维色谱系统采用固态调制器,一维色谱柱采用非极性二甲基聚硅氧烷固定相的色谱柱,二维色谱柱采用极性聚乙二醇固定相的色谱柱。在优化的色谱条件下,一次进样可以实现153种C_(6)~C _(12)芳烃组分的分离。汽油族组成中的芳烃在全二维谱图中呈带状分布,瓦片效应明显。考察了直馏汽油、重整汽油、催化汽油、焦化汽油、裂解汽油等不同类型组分汽油的全二维色谱的分离情况,裂解汽油中所含芳烯烃组分与烷基苯可以获得很好的分离。建立的采用内标法定量测定车用汽油中单体芳烃特别是C 9+芳烃含量方法的结果重复性和准确度良好,可以对清洁汽油生产工艺研究以及汽油产品的质量控制提供基础数据及方法支持。

A detailed qualitative and quantitative analysis of individual aromatic components in gasoline,especially C_(9+)aromatics,was carried out by comprehensive two-dimensional gas chromatography with hydrogen flame ionization detector(GC×GC-FID).The comprehensive two-dimensional gas chromatography system uses a solid-state modulator.The primary column is a non-polar column with dimethyl polysiloxane solid phase,and the secondary column is a polar column with polyethylene glycol stationary phase.Under the optimized chromatographic conditions,153 components of C_(6)—C_(12) aromatics can be separated by one injection.The aromatic hydrocarbons in the gasoline composition are distributed in bands in the comprehensive two-dimensional gas chromatogram,and the"tile effect"is obvious.The separation of different types of gasoline such as straight run gasoline,reformed gasoline,catalytic cracking gasoline,coking gasoline and pyrolysis gasoline by comprehensive two-dimensional chromatography was investigated.The olefinic aromatics in pyrolysis gasoline can be well separated from alkylbenzene.A method for quantitatively determining the monomer aromatics,especially C_(9)+aromatics in motor gasoline by internal standard method has been established,from which the quantitative results have good repeatability and accuracy.The method can provide fundamental data and methods supporting the research of clean gasoline production process and the quality control of gasoline products.