Abstract
During treatment of wood meal with nitrogen dioxide and oxygen the major proportion of the nitrogen dioxide and the intermediate nitric oxide is consumed within a few minutes. On prolonged treatment the concentrations decrease slowly due to regeneration of nitrogen dioxide by reactions between the modified lignin and nitric acid formed in the process. The conversion to nitric acid increases with an increased addition of nitrogen dioxide, a decreased dry content, and temperature. An appreciable proportion of the nitric acid is consumed on prolonged treatment.
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