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The research presented compares the effects of oxygen and hydrogen peroxide reinforcement in an alkaline extraction stage on lignin degradation using a chromatographic technique, which measures apparent molecular weight. These data, together with extent of delignification, cellulose degradation, and bleached brightness data, were used to provide insight into the types of lignin degradation reactions occurring. The combined data suggests oxygen and hydrogen peroxide react with both residual and dissolved lignins. Since oxidant reactions with dissolved lignins represent a waste of bleaching chemicals, alternative extraction stages were investigated. The purpose of the alternative stages was to preferentially direct the oxidants to react with the residual lignin. These alternative stages represent the first step in research directed towards a more efficient alkaline extraction stage.
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Lignin Structural Changes by Oxidative Alkaline Extraction, 1998 Pulping Conference Proceedings
