AS-AQ稻草浆全无氯漂白

Oxygen-Alkali Bleaching of AS-AQ Straw Pulp

研究了AS AQ稻草浆通过酸预处理后 ,借助H2 O2 强化的氧碱漂白及过氧化氢补充漂白。结果表明 ,稻草浆 (未漂浆白度为42 8%ISO ,卡伯值为 8 2 ,粘度为 91 3mL/g)经过一段强化氧漂 (用碱量 5 %、氧压 0 6MPa、H2 O2 用量 0 5 %、温度 1 0 0℃、保温时间 80min)之后 ,其白度达到 67 0 %ISO ,粘度为 841mL/g ,卡伯值为 3 1 ,适合进行下段漂白。过氧化氢补充漂白 (NaOH用量 0 3 %、温度 70℃、保温时间 80min、H2 O2 用量 3 0 %、浆浓 1 0 % ,DTPA用量 0 0 5 % ,MgSO4 用量 0 0 5 % )后 ,白度达到 73 4%ISO ,粘度为 82 3mL/g ,卡伯值为 2 2 。

Oxygen-alkali bleaching reinforced with H2O2 of acid pretreated AS-AQ straw pulp was studied. The result showed that the straw pulp (unbleached pulp had 42.8%ISO brightness, 8.16 kappa number and 913 mL/g viscosity) could be bleached to 65.7%ISO brightness after one stage oxygen-alkali bleaching (NaOH 0.5%, oxygen pressure 0.6 MPa, H2O2 0.5%, temperature 100°C and time 80 min). Its viscosity and kappa number was 830 mL/g, 3 .25. The pulp with higher and more stable brightness could be produced after next stage bleaching.