Abstract
Oxygen delignification is the standard bridging technology placed between pulping and bleaching. In order to improve the delignification/cellulose degradation selectivity, it is essential to understand the chemistry of oxygen delignification. Since oxygen delignification starts with abstraction of an electron from dissociated free phenolic lignin by oxygen, it would be logical to associate the decrease in lignin reactivity at high degrees of delignification with the depletion of phenolic groups. In commercial oxygen delignification of softwood Kraft pulp, part of the lignin is dissolved from the brownstock pulp by oxidation using pressurized oxygen at alkaline conditions and moderate temperatures. The incentive for high kappa oxygen delignification is an increase in bleachable-grade pulp yield. For high kappa oxygen delignification, the reactor design and operation must be changed to overcome the limitations in terms of lignin reactivity and delignification/cellulose degradation selectivity.
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