Size Exclusion Chromatography for the Separation of Whole Coal Liquids

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Abstract
Characterization of polystryene-divinylbenzene packing using low molecular weight compounds to determine mode and mechanism of separation in size exclusion chromatography (SEC) is described. Totally excluded and totally permeated molecular weights for four soft gels which differ only in percent crosslinking are determined. Tetrahydrofuran, pyridine, and chloroform were used as solvents. A large number of compounds, especially N-alkylated anilines, exhibited a non-size exclusion mechanism of separation. Exclusion limits for n-alkanes in pyridine were greater than in THF or CHCl3. Results with these soft gels were compared with data obtained on rigid gels. The application of this model study to the size exclusion chromatography of various solvent refined coal fractions is described.

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