Liquid Chromatography Separation of Non-Volatile Components in Fossil Fuels at Very High Resolution. Progress Report, July 1, 1981-March 31, 1982
(English)
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Characterization of the non-volatile fractions of various fossil fuels is of great importance from the technological and environmental point of view. The principal aim of our investigations is to develop preparative and analytical separations of very high efficiency to allow more detailed chemical identifications of the selected compounds of interest. While using crude synfuel materials as the model mixtures, we have evaluated two major sample fractionation approaches and preparative HPLC to provide preliminary separation into discrete classes of organic high-molecular-weight compounds. The individual fractions were screened by analytical HPLC for possible overlaps and the molecular-weight ranges; suitable columns and the optimum mobile-phase composition have been investigated. Different types of micro-HPLC techniques have been evaluated for both crude mixtures and fractionated samples. The present indications are that the loosely packed microcapillaries will have limited utilization for the analysis of complex mixtures in spite of their high efficiencies. However, glass and fused silica capillary tubes packed with small particles that were recently studied in our laboratory seem to have nearly ideal properties for the proposed investigations. Some very promising results have already been achieved with the mixtures of polycyclic aromatic compounds. Some progress has been made toward development of a two-flame nitrogen-sensitive detector for detection of heavy aza-arenes. Finally, the investigated microcolumns have shown promise in conjunction with the investigations of separated fractions by FT-NMR. 5 figures. (ERA citation 10:012116)