蔗渣甲酸法木素脱出动力学的研究

Organosolv Pulping of Bagasse with Formic Acid

相对碱法制浆,甲酸法制浆具有反应温度较低、溶剂易回收、污染较小的特点,适用于草类原料制浆。甲酸是一种溶解木素性能较好,自身酸度适合木素溶出的较佳有机溶剂。本研究通过设计序列实验,测定反应黑液中溶出木素,建立蔗渣通过甲酸蒸煮反应脱木素动力学关系。结果表明,在常压、甲酸体积分数90%、液比1:10、蒸煮温度100℃、反应时间80 min的蒸煮条件下,蔗渣纤维被分散成纸浆,并有较好的脱木素效果。其脱木素动力学方程为:D=0.74689×C^(1.68799)×(1-exp(-0.05171t)),该方程可以预测蔗渣纸浆过程的脱木素程度,并控制甲酸制浆的蒸煮过程。

Organosolv pulping process is an effective method to delignify lignocellulosic materials and produce pulp for paper. Formic acid pulping of bagasse was investigated under an atmospheric pressure condition. Under conditions with 90% （v/v） aqueous formic acid, ratio of liquor to bagasse 10（v/w） , pulping temperature 100℃, and pulping time 80min, bagasse pulp could be produced. Meanwhile, a kinetic model for delignification of bagasse during cooking with formic acid was established by statistic method from experimental results, that is D （Delignification） = 0.74689×C^1.68799×（ 1 - exp（ - 0.05171 t） ）, which can predict lignin removal during cooking process.