白杨木粉碱性过氧化氢漂白条件的优化

Condition Optimization for Bleaching Poplar Wood Powder by Alkaline Peroxide

摘要: 研究了碱性条件下过氧化氢对杨木木粉的漂白工艺,探讨漂白温度、漂白时间、H2O2用量、pH值及偏硅酸钠用量对白度的影响。结果表明,过氧化氢对杨木木粉漂白的最佳工艺条件为:H2O2用量为40%,Na2SiO3·9H2O用量为8%,pH值为10~11,漂液温度在60~70℃,漂白时间40 min。该工艺对杨木粉进行漂白,最高白度可达到85%~90%(ISO),高于文献上报道的H2O2漂白白度。

Abstract: An alkaline peroxide bleaching process was employed for bleaching poplar wood powder(PWP)and effects on bleached PWP brightness of each parameters of bleaching condition s were investigated. The optimal bleaching conditions could be proposed as 27.5% H2O2 dosage of 40%(w/w), 90% Na2SiO3·9H2O dosage of 8%, the bleaching pH value of 10-11, the bleaching could be carried out at temperature of 60-70 ℃ for 40 min. The maximum brightness can reach 85%-90% (ISO) of poplar powder, higher than that reported in the literature H2O2 bleaching whiteness.