热水和木聚糖酶预处理制备麦草碱法化机浆的研究

Bio-Chemi-Mechanical Pulping of Wheat Straw with Hot Water and Xylanase Pretreatment

对热水和木聚糖酶预处理的麦草碱法化学机械制浆过程中热水和木聚糖酶预处理的效果进行了研究。结果表明 ,在适宜条件下 ,采用热水和木聚糖酶预处理原料可以有效改善麦草碱法化机浆的抗张指数和撕裂度、降低碱的消耗 ,虽然成浆的白度稍有降低 ,但可漂性增加 ,漂白浆白度增加。热水预处理适宜的温度是 90℃ ,酶预处理段较佳的木聚糖酶用量和处理时间分别为 1 5IU/g和 1 2 0min。

Effect of hot water and xylanase pretreatment prior to soda treatment on chemi-mechanical pulping of wheat straw was studied. The results showed that pretreatment with hot water and xylanase prior to soda treatment improved tensile index and tear index of the chemi-mechanical pulp, and decreased soda consumption in chemical treatment stage. Compared to the controls, pretreatment with hot water and xylanase led to brightness decrease of chemi-mechanical pulp. However, the brightness of bleached pulp from pretreated wheat straw was higher in the same conditions of peroxide hydrogen bleaching. The suitable conditions of pretreatment with hot water were 90℃, 60min and with xylanase were 15 IU/g (on oven dry wheat straw), 48℃, 120min, pH 4.8, respectively.