Studies on the Oxidative Degradation of Coal(I)

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Samples of various rank coal and the extraction products of Onoura bituminous coal were oxidized by boiling with 1N-HNO3, and carbon distribution in the oxidation products and the properties of humic acids obtained were studied. In cases of lower-rank coal, maximum point of yields was observed in yield-time curve. This maximum point was observed in shorter oxidation time. In cases of higher-rank coal, however, increase of oxidation time resulted in increase of humic acid yield, reaching to a constant value. No maximum point as was observed in the low-rank coal was observed. The humic acids obtained from higher-rank coal showed higher carbon content, lower H/C atomic ratio, and lower equivalent weight, than these corresponding values obtained in the cases of lower-rank coal.<BR>These facts indicate that the fundamental structures (the parts of coal transferred to humic acids) of the lower-rank coal are smaller and less condensed, and that binding parts of the fundamental structures are larger than those of the higher-rank coal respectively. Results of oxidation of the extraction products of Onoura bituminous coal, lead to that the solid bitumen and the residual coal gave the humic acids of the similar structure, however, the oil bitumen gave different kinds of humic acids.
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