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The effect of polysulfide (PS) and anthraquinone (AQ)addition on kraft cooking is investigated together with oxygen delignification of the high-yield PS/AQ kraft pulps. Addition of polysulfide and AQ increases pulp yield. The yield benefit is considerably lowered when cooking to kappa numbers below 27-28. Oxygen delignification to about 55%delignification preserves the yield increase attained by PS/AQ addition. For two-stage extended oxygen delignification beyond 55% kappa decrease, the yield increase is lowered. Peroxyacetic acid “activation” of the pulp followed by a second oxygen stage also lowered the yield significantly. From the data presented, optimal yield for bleached pulp would be reached when cooking with PS/AQ addition to kappa numbers between 40 and 45, followed by oxygen delignification to kappa numbers around 22. This could then be followed by bleaching with more selective bleaching chemicals like ozone and/or chlorine dioxide.
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Improving the Pulp Yield By Using PS/AQ and/or Two Stage Oxygen Delignification, 1998 Breaking the P
