Using Additives for the Removal of Extractives in Kraft Pulping and Bleaching of Hardwood

Abstract The effect of four additives (surfactants and dispersant) that were supplied by Hercules Chemicals Singapore Pte Ltdon kraft pulping and bleaching of Eucalyptus camaldulensis and Acacia mangium has been studied. The use of additives results in amore removal of extractives, and in a more uniform cook with lower screen rejects in eucalyptus, lower residual alkali, and in an im-provement in brightness of eucalyptus pulps. At low additive charge level, a reduction of kappa number generated without clear lossof pulp yield in acacia cook.

Using Additives forthe Removal of Extractives in Kraft Pulping and Bleaching of Hardwood

The effect of four additives (surfactants and dispersant) that were supplied by Hercules Chemicals Singapore Pte Ltd on kraft pulping and bleaching of Eucalyptus camaldulensis and Acacia mangium has been studied. The use of additives results in a more removal of extractives, and in a more uniform cook with lower screen rejects in eucalyptus, lower residual alkali, and in an improvement in brightness of eucalyptus pulps. At low additive charge level, a reduction of kappa number generated without clear loss of pulp yield in acacia cook.