Structural investigations of Australian coals—IV. A characterization of the variation in rank of bituminous coal fractions by elemental analysis and I.R. spectroscopy |
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| Authors: | TV Verheyen RB Johns RJ Esdaile |
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| Institution: | Department of Organic Chemistry, University of Melbourne, Parkville, Victoria, Australia, 3052 |
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| Abstract: | A series of seven Permian Australian bituminous coals of varying rank, were examined by quantitative infrared spectroscopy, using absorption coefficients K(cmmg?1) and elemental analysis in the form of bond equivalence data. Both analytical techniques were found to be complementary in their average structural predictions. The coals were chemically fractionated into Total Solvent Extractables (T.S.E.), Solvent Extractable Humic Acids (S.E.H.A.) and insoluble Kerogens. Molecular condensation was found to decrease for the T.S.E. fractions, and increase as expected, for the insoluble kerogen fractions, as a function of increasing coal rank. The effect of aqueous base extraction upon the kerogen fraction, observable as an increase in oxygen by bond equivalence, could be related to minor changes in I.R. absorption coefficients and difference spectra. |
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