ON THE RECOVERY OF HEMICELLULOSE BEFORE KRAFT PULPING

ON THE RECOVERY OF HEMICELLULOSE BEFORE KRAFT PULPING

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To assess the feasibility of implementing hemicellulose recovery stages in kraft mills, Eucalyptus globulus wood turbo air m3f72-3-n samples were subjected to aqueous treatments with hot, compressed water (autohydrolysis processing) to achieve partial dissolution of xylan.Autohydrolyzed solids were subjected to kraft pulping under selected conditions to yield a pulp of low kappa number, and to an optimized TCF bleaching sequence made up of three stages (alkaline oxygen delignification, chelating, and pressurized hydrogen peroxide), with minimized additions of pulping and bleaching chemicals.The final product had a relatively click here low kappa number (1.4), 641 mL/g ISO intrinsic viscosity, and 86.

4% brightness.