Capillary Columns with Imidazolium and Pyridinium Ionic Liquids for Analysis of High Boiling Samples by Comprehensive Two Dimensional Chromatography
Comprehensive two dimensional chromatography (GCxGC) is a high-effective technique for analysis of complex multicomponent mixtures.
An important advantage of GCxGC is that it allows analyzing of complex samples by separating the components in groups according to chemical classes. Frequently those samples contain high-boiling fractions of compounds. The examples of those samples are crude oil, products of petrochemistry, coal chemistry and etc. It is known that in order to obtain the best separation power in GCxGC one should use as polar phase as possible for one of the dimension. However, the thermal stability of common polar and high polar stationary phases is not sufficient to analyze high boiling complex samples.
Recent advances in the development of new liquid phases made it possible to use some classes of ionic liquids (ILs) as polar stationary phases . There are works devoted to research of columns with imidazolium and phosphonium ILs for GCxGC in the literature . However, the possibility of using ILs for high temperature GCxGC separations (up to 300°C) is not closely investigated. Our work is devoted to the research of imidazolium and pyridinium ILs as stationary phases columns for GCxGC. In our earlier studies we have shown that these classes of ILs allow to work at the temperature up to 300°C  and possess different range of selectivity . Therefore, we consider that their use in GCxGC will allow to obtain the high selective separations at high temperature. In our work the series of columns with pyridinium and imidazolium ILs were prepared and were investigated as columns for GCxGC. These columns were shown to work at the temperature 280°C-300°C with good separation characteristics. The number of separation of multicomponent high boiling samples was obtained. Among them: crude oil and oil products, natural bitumen, high boiling mixtures of biological .
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