Reactions of carbohydrates – oxygen-alkali delignification General aspects The term “selectivity” can be simply defined as the ratio of removal of pulp lignin to that of pulp carbohydrates.1 Pulp carbohydrates, cellulose (65−75 % of unbleached pulp) and hemicelluloses (20−30 % of unbleached pulp),2 are the structural components contributing to pulp strength. Hence, it is desirable
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