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Several softwood and hardwood kraft pulps were delignified by multi-stage oxygen (O) bleaching. In all cases delignification almost stopped after 3 successive O stages, which corresponded to about 75% and 60% delignification for the softwood and hardwood pulps respectively. The remaining lignin would be attached to carbohydrates by linkages which resist oxygen bleaching but not chlorine dioxide bleaching (D). Sequences combining O and D stages such as ODOD... were proposed. Attractive results were obtained when D was performed at high temperature for a short time and washing was omitted between D and O. AOX as low as 0.2 kg/t of pulp were measured.
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Limits of Oxygen Delignification, 1998 Pulping Conference Proceedings