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Washing in the oxygen delignification stage in aspen kraft pulping has been shown to have a positive effect on the reduction of extractives in pulp. Bouchard et al. have previously shown that this positive impact can be enhanced by the addition to oxygen delignification of certain generic types of surfactants. Based on these results, further work has been carried out to investigate the effect of a selection of commercially available surfactant blends on providing an even greater efficacy in extractives reduction. One of the formulations was particularly effective in enhancing extractives removal in an oxygen stage environment.
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Improved Deresination During Oxygen Delignification. Part II: Effects of Blended Surfactant Addition