Use of Partition Coefficients in a Hexane-Acetonitrile System in the GC-MS Analysis of Polyaromatic Hydrocarbons in the Example of Delayed Coking Gas Oils.

The partition coefficients' application in the hexane-acetonitrile system as an additional identification feature of polyaromatic hydrocarbons in the review gas chromatography-mass spectrometry analysis of delayed coking gas oils has been considered. The UNIFAC model was used to calculate the partition coefficients of polycyclic aromatic hydrocarbons. It is shown that methyl derivatives of naphthalene, fluorene, anthracene, and pyrene can be identified with an accuracy up to several methyl groups by the position of the figurative point on the partition coefficient-retention index plane.