耐热耐碱木聚糖酶对马尾松KP浆的助漂性能

Effect of thermostable and alkaline tolerant xylanase pretreatment on the bleaching properties of pine kraft pulp

根据预处理前后纸浆黏度和卡伯值的变化,研究了耐热耐碱木聚糖酶X对马尾松硫酸盐浆预处理的选择性;通过分析酶预处理对各漂段白度和终漂黏度的影响,揭示了该酶对D0E1D1E2D2漂白特性的影响。结果表明:耐热耐碱木聚糖酶X预处理具有较高的助漂选择性,处理后纸浆的卡伯值和黏度变化不大;耐热耐碱木聚糖酶X的适应性较广,在pH8.0～9.5、温度为75～80℃范围内都可以发挥其有效的助漂作用;在相同漂剂用量下,耐热耐碱木聚糖酶X预处理可提高浆的终漂白度,而黏度略有下降,在达到相同白度(90%ISO)时可减少D0段ClO2用量26%～27%。

The selectivity of thermostable and alkaline tolerant xylanase X on the pretreatment and pine kraft pulp bleaching was studied according to the change of pulp viscosity and kappa number before and after the pretreatment. The effect of the pretreatment on D0E1D1E2D2 bleaching properties was revealed by the changes of brightness of each bleaching stage and final viscosity. The results showed that the pretreatment had high selectivity without causing an obvious decrease of the pulp viscosity. The effective pretreatment conditions can be varied among pH 8. 0—9. 5 and 75—80 ℃. The final brightness of the bleached pulps pretreated with xylanase X was 1 % ISO higher than that of no-pretreated one （90 % ISO brightness）,but the viscosity lowed little under the same bleaching conditions or the ClO2 dosage in the D0 stage could be saved by 26 % —27 % to achieve the same brightness （90 % ISO） of the no-pretreatment bleached pulp.