An Application of Multi-Dimensional Capillary Gas Chromatography to Analysis of Petroleum Products

Abstract

A precutting Multi-Dimensional Capillary Gas Chromatograph (MDCGC) was made of a commercially available capillary GC only by making simple modification of its flow control units. The MDCGC system was applied to the selective determination of aromatic hydrocarbons in gasoline and kerosene. Gasoline was introduced into a polar precutting capillary column, on which aromatic hydrocarbons were more retained than the other hydrocarbons and removed by precutting operation. Paraffins, naphthenes and olefins which were introduced into nonpolar main capillary column were chromatographed without being interfered by aromatic hydrocarbons (except benzene and toluene). Kerosene injected to a nonpolar precutting capillary column was eluted out of it in the order of boiling points regardless of the chemical structure. The peaks of n-paraffins were used as the scale of classification. The aromatic hydrocarbons eluted between two n-paraffin peaks were isolated as a group and then separated on a polar capillary column. Aromatic hydrocarbons were separated and eluted after saturated hydrocarbons.