馏分油沸程分布气相色谱分析方法的选择及应用

对毛细管气相色谱测定馏分油沸程分布的ASTM D2887，ASTM D7213，ASTM D6352，ASTM D7500方法进行了比较,考察了4种标准方法测定结果的相关性，对方法中所使用色谱柱的液膜厚度也进行了讨论。试验结果表明，在上述标准方法各自的适用范围内，各种方法测定沸程分布的结果基本一致。采用ASTM D2887标准方法测定初馏点大于55.5 ℃、终馏点低于538 ℃的轻馏分油的沸程分布，精密度高；采用ASTM D7500标准方法测定润滑油、VGO等石油产品或重馏分油的沸程分布，测定范围宽。测定含有n-C100以上重馏分油的沸程分布时，建议使用0.1 μm的薄液膜色谱柱，以保证测定结果的准确性。

SELECTION AND APPLICATION OF ANALYTICAL METHODS FOR BOILING RANGE DISTRIBUTION OF PETROLEUM FRACTIONS BY GAS CHROMATOGRAPHY

Four standard test methods for determining the boiling range distribution of petroleum fractions by gas chromatography were compared,and data correlations of these standard test methods were studied as well.The test results of these four standard methods were basically in good agreement.ASTM D2887 method is simple,fast and with good precision for analyzing petroleum fractions in the boiling range of 55.5—538 ℃.ASTM D7500 method having wide measurement range is preferred to determine petroleum fractions,such as various lubricating oils,VGO and other heavy petroleum fractions.The effect of film thickness of capillary column on the determination result was also discussed.When testing heavy oil sample containing over n-C100 hydrocarbons,capillary column with film thickness of 0.1 μm is suggested to be used for better determination accuracy.