Thermostable Columns Based on Ionic Liquids for the Analysis of Hydrocarbon Mixtures by Two-Dimensional Chromatography

摘要

We studied thermostable capillary columns with stationary phases based on ionic liquids (IL) as the second columns in two-dimensional chromatography. The use of dicationic imidazolium and pyridinium ILs was shown to provide higher working temperatures compared to conventional polar phases ( up to 280-300 degrees C), which allows qualitative separations of high-boiling hydrocarbon mixtures, for example, catalytic gas oil with bp up to 400 degrees C. It was shown also that a higher selectivity of separation between the groups of aromatic hydrocarbons compared to the commonly used polyethylene glycol-based polar phase can be achieved on such columns.