Abstract
Abstract During pre treatment of unbleached kraft pulp with 1-4Z nitrogen dioxide in the presence of oxygen 50–86 mole percent of the nitrogen dioxide was converted to nitric acid. The conversion was suppressed at high temperature and consistency and by a decreased addition of nitrogen dioxide. In most experiments the proportion of nitric acid decreased with an increased duration of the treatment although nitric acid was produced. The results confirm that nitrogen dioxide is regenerated in a reaction cycle and show that nitric acid serves as a source of nitrogen dioxide.
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