关键词: 汽油, 单体烃, 快速分析, 气相色谱, 物性参数

Abstract: A fast gas chromatographic method for detailed hydrocarbon analysis of gasoline was established by using a 40 m×0.10 mm×0.20 μm narrow diameter non-polar capillary column and H₂ as carrier gas. For the fluid catalytic cracking gasoline sample, it could be separated to get 367 chromatographic peaks from C₃ to C₁₂ range, with retention time of 30 min for n-dodecane. The absolute difference of retention times for the same component of three runs were less than 0.02 min, and the absolute difference of retention indices were less than 0.50. For the components with concentrations above 0.5%, the relative standard deviations of the results were less than 6%. And for the components with concentrations below 0.5%, the relative standard deviations of the results were less than 10%.Corrected models for calculation of physical/chemical parameters ,including density, refractive index, saturated vapor pressure, carbon and hydrogen element content, bromine number, and average molecular weight, were established. Calculation results of density, refractive index, saturated vapor pressure of gasoline samples showed consistent with the results from real analysis. The physical/chemical parameters calculated using hydrocarbon results from fast analysis showed consistent with that from routine analysis using 50 m×0.20 mm×0.50 μm non-polar column, which meant that the established corrected models could also be used to calculate the physical/chemical parameters with the data from fast analysis.

Key words: gasoline, detailed hydrocarbon, fast analysis, gas chromatography, physical/chemical property