An Attempt at Quantifying Bleachability of Hardwood Chemical Pulps, 2006 Engineering, Pulping, & Environmental Conference

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The kappa number reduction caused by O₂ delignification varies quite significantly amongst hardwood kraft pulps for reasons that are not yet clear. However, it does not appear that variation intransition metal contents of the pulps entering the O stage is a major contributor. A straight line correlation was obtained between O₂ kappa number and final light absorption coefficient (LAC) value after standardized OD₀E_pD₁ bleaching for a wide range of hardwood kraft pulps. The bleachability of pulps from three different soda processes catalyzed by anthraquinones were compared to kraft pulps. The evaluation was based on kappa number reduction due to O₂ and final LAC value as compared to that calculated from the linear regression equation for kraft pulps.