Kinetics of Adsorbable Organic Halogen Formation During Chlorine Dioxide Bleaching of Eucalyptus Kraft Pulp
Kinetics of Adsorbable Organic Halogen Formation During Chlorine Dioxide Bleaching of Eucalyptus Kraft Pulp
复制标题
桉树牛皮纸浆二氧化氯漂白过程中可吸附有机卤素形成的动力学
DOI：
10.1166/jbmb.2018.1767
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发表时间：
2018-04
影响因子：
0.5
通讯作者：
Wang Shuangfei
中科院分区：
文献类型：
--
作者：
Yao Shuangquan;Gao Cong;Wang Cheng;Shi Lisheng;Qin Chengrong;Wang Shuangfei
为减少可吸附有机卤素（AOX）的生成提供理论依据，建立了桉木硫酸盐浆无元素氯（ECF）漂白第二段（D1）的动力学模型。D1阶段AOX动力学方程为dw/dt = 51.94e-3.11/T [H+]0.25[ClO 2 ]0.78 K 1.16，萃取后卡伯值、ClO 2浓度和H+浓度的幂律指数分别为1.16、0.78和0.25。相关系数R2均大于0.9，表明模型的拟合结果与实验值接近。在D1期，发色团被去除. AOX反应速率主要由纸浆中的提取后木质素的量和D1中的ClO 2电荷决定。AOX反应速率的活化能为0.03 kJ · mol-1，表明该反应是可行的。
To provide a theoretical basis to reduce adsorbable organic halogen (AOX) formation, a kinetic model of the second chlorine dioxide bleaching stage (D 1) is presented for elemental chlorine-free (ECF) bleaching of eucalyptus kraft pulp. The AOX kinetics of the D 1 stage can be expressed as dw/dt = 51.94e–3.11/T [H+]0.25[ClO 2 ]0.78 K 1.16, the power-law exponents for post-extraction kappa number, ClO2 concentration and H+ concentration were 1.16, 0.78 and 0.25, respectively. The coefficient of correlation (R 2) values were greater than 0.9, which indicated that model's prognostications are close to experimentally measured values. In the D 1 stage, chromophoric groups were removed. The AOX reaction rate was primarily governed by the amount of post-extraction lignin in the pulp and the ClO2 charge in D 1. The activation energy of the AOX reaction rate was 0.03 kJ · mol–1, which indicated that the reaction was practical.