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详细研究了54种常见的C5～C7烃类组分在S型、KCl型和M型3种类型Al2 O3毛细管色谱柱上的分离和定性，结果显示大部分C5～C7烃类组分在3种类型Al2 O3毛细管色谱柱上的分离效果良好，但也存在一些组分分离不完全或共流出的现象，3种类型Al2 O3毛细管色谱柱上的分离效果也存在一定的差异。共测定了15个C5烃类组分，25个C6烃类组分及14个C7烃类组分在这3种类型Al2 O3毛细管色谱柱上的线性程序升温保留指数，为C5～C7烃类组分在Al2 O3毛细管色谱柱上的定性提供了依据。同时定量分析了某石化企业的裂解气样品中C5～C7烃类组分的含量。本研究拓展了Al2 O3毛细管色谱柱的应用范围，可以为石化企业轻烃的分析提供参考。

The separation and qualitative analysis of 54 common C5-C7 hydrocarbon compo?nents on three Al2 O3 capillary columns, including S type, KCl type and M type, were investiga?ted in detail. The results showed that the separation of the 54 C5-C7 hydrocarbon components were partly different on these three Al2 O3 capillary columns, and the most of C5-C7 hydrocar?bon components could be well separated, except that some of them couldn’ t achieve a baseline separation or co?eluted. Linear temperature programmed retention indices of the 54 C5-C7 hydrocarbon components, including 15 C5 hydrocarbons, 25 C6 hydrocarbons and 14 C7 hydro?carbons, were determined on these three Al2 O3 capillary columns. The determination of linear temperature programmed retention indices for these C5-C7 hydrocarbon components on Al2 O3 capillary columns provided a basis for the qualitative analysis of them. At the same time, a real pyrolysis gas sample from one of the petrochemical plants was qualitatively analyzed according to the linear temperature programmed retention indices, and the contents of C5-C7 hydrocarbon components were determined. The application field of Al2 O3 capillary column was expanded and it is helpful for the analysis of light hydrocarbons in petrochemical enterprises.