Abstract
The TGA/DSC equipment offers a simple and accurate method for determination of the amount of the organic matter in oil shales and also for differentiating between volatile and non-volatile fractions. This was done by first carrying out the thermogravimetric analysis in nitrogen, to obtain the volatile fraction, followed by heating the residue in oxygen, to obtain the amount of residual char. The results were quite reproducible and the method was used for comparison of Misnor Rotem shales, from Israel and Kentucky and Green River shales, from the U.S.A. The method was also used as an analytical tool for evaluation of the efficiency of different solvents in supercritical extraction of oil shales and comparison of the extracts with kerogen and retort oil.
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