高纯耐热耐碱木聚糖酶预处理对杨木KP浆漂白特性的影响

研究了耐热耐碱木聚糖酶X对杨木硫酸盐浆预处理的选择性及其对无元素氯(ECF)漂白特性的影响。结果表明:该木聚糖酶预处理具有高的助漂选择性,预处理对纸浆的得率及黏度影响不大;该木聚糖酶对温度及pH的适应范围较广,在温度为75～80℃、pH 8.0～9.5范围内都可以发挥有效的助漂作用,尤其在温度80℃、pH 8.0、酶用量2 IU/g的条件下更能发挥酶效;耐热耐碱木聚糖酶X预处理可减少漂白ClO2用量,当达到对照浆相同白度(90%ISO)时可减少D0段26%～27%的ClO2用量(相当于总用氯量的16%)。

The Effect of Thermostable and Alkaline Tolerant Xylanase Pretreatment on the Bleaching Properties of Poplar Kraft Pulp

The selectivity and its effect of the pretreatment on the elemental clhlorine free （ECF） bleaching properties by a thermostable and alkaline tolerant xylanase X were sLudied. The results show that the pretreatment has high selectivity, without causing an obvious decrease of the pulp viscosity, the effective pretreatment conditions can be varied among 75~80~C and pH 8.0~9.5, and the better pretreatment conditions were 80~C, pH 8.0 and enzymes dosage 2 IU/g. The final brightness of the bleached pulps with the pretreatment by the xylanase X was ] %ISO higher than that unpretreatment bleached pulps （90%ISO brightness）, or the C102 dosage in the Do stage could be saved by 26%-27% to achieve the same brightness （90%ISO） of the unprereatment bleached pulp.