Determination of Unsaturated Hydrocarbons in Oil and Its Processing Products by Capillary Gas Chromatography and High-Performance Liquid Chromatography

The initial information for calculating the physical, chemical, and operational properties of gasoline is data on its group composition. The complex composition of gasoline fractions (according to capillary gas chromatography (CGC), comprising about 150–250 components) greatly complicates the rapid determination and identification of unsaturated hydrocarbons, which are the most important part of gasoline. As a rule, it is not possible to achieve complete separation of chromatographic peaks even on highly efficient 100-meter capillary columns. Poor reproducibility of the properties of capillary columns requires a large number of comparison samples, which complicates the identification of the separated components. A combination of high-performance liquid chromatography (HPLC) and CGC methods allows simplifying the methodology and increasing the accuracy and rapidity of the analysis.