低卡伯值麦草浆全无氯漂白的研究

对低卡伯值的麦草浆采用全无氯漂序0QP和0QP1P2进行漂白，探讨了不同目标白度（78．0％ISO至85．7％ISO）的工艺条件。研究结果表明，低卡伯值麦草浆经氧脱木素（0）和螯合预处理（Q）后，纸浆的kaPPa值为5．9，黏度为965ml／g。两段常压过氧化氢漂白后，纸浆的最高白度为85．7％ISO。其工艺条件如下：0段：氧压0．7MPa，反应温度100℃，反应时间60min，NaOH用量4．0％，MgSO4用量0．5％；两段常压过氧化氢漂白的工艺条件：反应温度80℃，总H2O2用量8．0％，但实际消耗的过氧化氢量较少，这主要是因为螯合处理后未漂浆的卡伯值仅为3．9，铁离子含量为29mg／kg，铜离子含量为19mg／kg，锰离子含量为5mg／kg。

TCF bleaching of low kappa number wheat straw pulp

Totally chlorine-free bleaching sequence （OQP/OQP1P2） of low kappa number wheat straw pulp and the operating conditions for various brightness （from 78.0%ISO to 85.7%ISO） of bleached pulp were investigated. The results show that chelated oxygeu-delignification of wheat straw pulp has a kappa number of 3.9, a viscosity of pulp 965 ml/ g. The process conditions to the highest ISO brightness of 85.7% are as follow： O stage, oxygen pressure 0.7MPa, reaction temperature 100℃, reaction time 60 min, NaOH charge 4.0%, MgSO4 charge 0.5%, reaction temperature 80℃, total H202 dosage 8.0%, but the consumption of H2O2 is low, because the kappa number and content of transition metal are low. The kappa number is 3.9, the content of Fe is 29 mg/kg, the content of Cu is 19 mg/kg, and the content of Mn is 3 mg/kg, respectively.