作者：FenghuaTang; yunzhanZhang; GuodongLutcf漂白高产量化学纸浆白杨木去木质素作用
摘要：The paper is to study the TCF bleaching of high-yieldchemical pulp of NS-AQ aspen (digester yield63.7%, Kappa number 37.3, brightness 50.0%ISO.intrinsic viscosity 1,340ml/g). Under the suitableconditions ( oxygen pressure 0.6MPa, 85~C, 80min..NaOH 5%, MgSO4 0.3%, consistency 11% ), oxygendelignification, can increase the brightness of pulp to64.9%ISO, substantially decrease Kappa number to9.11. Before the oxygen delignification pretreatingpulp by acidic chelant ( Qa ) under conditions of pH3.0, 30min, 40~C, DTPA 0.25%. consistency 15%,and after the Qa strengthening oxygen delignificationby H202 ( Op, H202 2% ) can increase the brightnessof pulp to 77.1%ISO, decrease Kappa number andintrinsic viscosity to 6.36 and 984ml/g, respectively.After the Op, pretreat pulp by chelant once again( pH 6.0, 60~C, consistency 12%~ other as the Qa )~and following this pretreatment do bleach with 1%H202, namely using Qa-Op-Q-P bleaching sequence,resulting in the brightness 84.8%ISO, Kappa number5.01, intrinsic viscosity 792ml/g, total bleaching loss12.17% for bleached ~ul~.
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