色谱与色谱/质谱法相结合分析热裂解汽油C9馏分

采用毛细管气相色谱-氢火焰离子化检测器（CGC-FID）和气相色谱-质谱法(GC/MS)分析了热裂解汽油C9 馏分的组成。实验使用PONA毛细管气相色谱柱(100 m×0.25 mm i.d.×0.5 μm),根据烃类化合物在PONA柱上的保留规律,以正构烷烃标样保留值作为碳数分布依据,定量分析了裂解汽油C9 馏分中烃类化合物的碳数分布和单体烃含量;用GC/MS联用技术和CGC保留值定性法相结合对裂解汽油C9 馏分中相对含量大于0.2%的39种化合物进行了定性。

Analysis of C9 Fraction of Pyrolysis Gasoline by Gas Chromato-graphy and Gas Chromatography/Mass Spectrometry

The constituents of C9 fraction of pyrolysis gasoline were analyzed by gas chromatography (GC) with flame ionization detector (FID) and gas chromatography/mass spectrometry (GC/MS). A 100 m x 0.25 mm i. d. x 0.5 microm PONA column was used to improve the separation efficiency and sample load compared with the standard PONA column of 50 m x 0.20 mm i. d. Identifications of compounds were based on the standards of n-alkanes and a few aromatics, high accuracy retention time simulation and live retention time database, and cross-references with MS data. The search in live retention time database gives a few possible compounds that were co-eluting or adjacent from each other. While the MS search results for each peak always report 10 or even more compounds who has similar fragments. The cross-reference of the above method yields much more reliable identification results than normal GC/MS search. Quantitative analysis of each compound and the carbon number distribution were performed by GC with FID. Thirty-nine compounds with contents more than 0.2% in the C9 fraction were identified. The relative standard deviation of quantitative analysis was below 5%. It provides a reliable method for detailed analysis of C9 fraction.