Abstract
The results of a study aimed at evaluating the effect of air oxidation on humic acid production from two Alaskan subbituminous C coals are reported. Raw as well as partly acid-demineralized and debituminized samples of the coals were oxidized at 120 and 180 °C in a forced air circulating oven for up to 12 d. Humic acid was extracted from the oxidized samples by sodium hydroxide. The yield of humic acid increased with increase in temperature and oxidation time. Humic acid production was enhanced by partial demineralization. Solvent extraction of coal before oxidation hindered humic acid formation. The rate of humic acid formation increased at first with increase in oxidation time, reached a maximum and then decreased.
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