STRUCTURE AND PROPERTIES OF HUMIC ACIDS OBTAINED FROM THERMO-OXIDIZEDBROWN-COAL

The opportunity to isolate a considerable number of humic acids from t he brown coal thermooxidative treatment products in the presence of sm all portions of oxygen and water has been shown. Variations in the fun ctional content, thermal stability and biological activity of the prep ared humic acids depending on the conditions of coal thermal processin g have been revealed. It has been found that under the conditions of m ild thermooxidative destruction a semicoke may yield up to 37.4% of th e so-called 'high-temperature' humates and residual coal whose methyle ne-blue activity is 207.5 mg/g which is equal to that of the good acti vated carbon. (C) 1998 Elsevier Science Ltd. All rights reserved.