漆酶介体体系改性的三倍体毛白杨APMP浆漂白工艺的优化

Bleaching Optimization of APMP Pretreated with Laccase and Laccase/Mediator System

研究探讨三倍体毛白杨碱性过氧化氢机械浆由漆酶介体体系进行生物改性和过氧化氢漂白后的各种主要的影响因素。利用LMS体系对APMP纸浆进行改性的最佳工艺条件为:在通氧气的条件下,漆酶用量2U·g-1,介体(HBT)用量0.5%(对绝干浆),浆浓4.0%,温度50℃,反应时间60min,pH值5.0。优化后漂白的最佳工艺条件为:NaOH4%(质量分数,下同),H2O25%,Na2SiO35%,MgSO40.1%,EDTA(乙二胺四乙酸)0.5%,浆浓10%,漂白温度70℃,漂白时间1.5h。和对照浆相比,经过漆酶介体和漂白处理后的APMP的物理强度性能有了很大程度的改善。

The Alkalin Peroxide Mechanical Pulps（APMP）of Triploid of populus Tomentosa were modified by Laccase- Mediator-System（LMS）,and then were bleached with hydrogen peroxide.The main impacting factors were investigated.The optimum conditions of laccase/mediator system process were：pulp consistency 4%,pH 5,at temperature 50℃ for 60min and the optimum charge of laccase was 2U·g -1 with 0.5%mediator（HBT）.It was found that the optimum conditions were：4%NaOH,5% H2O2,5%Na2SiO3,0.1%MgSO4,0.5%EDTA,10%pulp consistency at 70℃ for 1.5 hours.e effects on pulp physical properties were analysed by testing the hand-made sheets.ese results showed that the strength properties of APMP treated with laccase/ mediator followed by hydrogen peroxide bleaching increased significantly compared to control pulp.