Abstract
In this paper the effect of residence time on variation in helium density, specific energy, acid equivalents, carboxyl and phenolic acidity values in the process of low temperature oxidation of Assam Coal has been highlighted. It has been observed that the progressive increase of oxidation time resulted in reduction of specific energy but caused to increase in helium density, acid equivalents, carboxyl and phenolic acidity values of oxidised product. The specific energy of oxidised coal is found to correlate linearly with helium density with correlation coefficient of 0.996.
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