关键词: 汽油, 储存安定性, 烃族组成, 逐步线性回归, 相关分析, 回归模型

Abstract: Gasoline is composed of various kinds of hydrocarbons, including n-alkane, isoparaffin, naphthenic hydrocarbon, aromatic hydrocarbon, isoolefine, normal olefin, cyclic olefin and diolefin. Correlation analysis method is adopted to investigate the interrelation of various kinds of hydrocarbons in gasoline blending components or gasoline products and the gasoline storage stability indexes. Furthermore, a regression model of storage stability indexes and hydrocarbon group compositions is established by stepwise linear regression method. According to the regression model the main hydrocarbon compounds affecting the indexes of gasoline storage stability are as follows: aromatic hydrocarbons greatly influence the octane number, 10% evaporating temperature, 50% evaporating temperature, density and colourity; olefins, especially isoolefine and normal olefin, influence 90% evaporating temperature, acidity, gum, induction period, iodine value and saturated vapor pressure most. The results of F inspection show that the regression model with high significant can be used to predict the storage stability of domestic gasoline product.

Key words: Gasoline, Storage Stability, hydrocarbon group composition, Stepwise Linear Regression Method, Correlation Analysis, Regression Model