Abstract
The potential of a coal- or shale-derived liquid fuel precursor to be upgraded to a fuel product can be assessed if the composition of the precursor is known. Herein is described a technique utilizing high-performance liquid chromatography (HPLC) and gas chromatography-mass spectroscopy (GC-MS) which provides sufficient compositional data to allow one to estimate fuel upgrading potential. Samples are first filtered and then subjected to a liquid-liquid extraction to remove solids and phenolics, which have deleterious effects on the HPLC separation. The liquids are then fractionated by using a semipreparative column into aliphatics and aromatics by ring size using HPLC and collected for off-line injection into the GC-MS, where further compositional information is obtained. Using this method, it is possible to quantitate the components present that are of most interest in assessing the potential of a fuel. These components include the various classes of aliphatics (such as straight chain, branched, cyclic, etc.) and the 1-, 2-, and 3-ring aromatics. A discussion of the experimental details along with data from several samples is presented
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