Oxidative pretreatment of Southern pine wood with alkaline hydrogen peroxide increased its rate of delignification during subsequent kraft and soda-AQ pulping. Effective pretreatment required the removal of transition metals prior to oxidation at high pH (12), low teaperature (50#xB0;C) and short reaction time (45 min.). Compared with reference pulping, pretreatment with 1.4 H2O2 and 3.3 NaOH on wood reduced pulping time to 35 kappa number by 30 minutes (at 170#xB0;C). Pre-oxidation resulted in pulp with yield-kappa number and viscosity-kappa number relations equal to or greater than those of corresponding reference pulp.
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