Abstract
Wandoan Australian coal was extracted with benzene-ethanol and part of the residue was further extracted with pyridine at 350 °C. The n-hexane-soluble fractions of the two extracts have similar distributions of n-alkanes, methyl esters of straight-chain carboxylic acids and unidentified homologues C n H 2 n − 2 O 2 (or C n H 2 n O). This suggests that a large amount of extractable organic material is trapped in the coal matrix so tightly that it cannot be fully extracted using ordinary methods. Another part of the residue from the benzene-ethanol extraction was hydrogenated and the hexane-soluble part was separated into saturate, aromatic and polar fractions. The polar fraction was again hydrogenated in the same way. From the results of analysis it was concluded that paraffins in the hydrogenation product represented the reduction or decarboxylation products of straight-chain esters.
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