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Formation of carbon dioxide and dinitrogen oxide during treatment of kraft pulp with nitrogen dioxide

Even if no oxygen is added, NO, is regenerated from produced nitric acid when lignin containing pulp is treated with NO, in the presence of water. The formation of CO, and N20 is favored by oxygen under such conditions that the regeneration of NO, is promoted by oxygen. Reactions which suppress the production of CO, and N,O are also favored by oxygen. One reaction is the formation of nitric acid from added and regenerated NO,.