Effect of Neutral Xylanase Pretreatment on ECF Bleaching of KP Bamboo Pulp with Low Kappa Number

At present, most of the studies of Xylanase auxiliary bleaching focused on in the alkaline or acid conditions. It was investigated in this paper that Neutral Xylanase had been used to pretreat the oxygen delignified KP bamboo pulp with low kappa number. The effect of Xylanase on the follow-up ECF bleaching was discussed, especially highlighting the principle of the residual lignin removal and improvement of pulp’s brightness. Results showed that the effect of neutral xylanase pretreatment on ECF bleaching of KP bamboo pulp was obvious. The pulp with a higher brightness and brightness stability could be obtained in this way. The optimum charge of xylanase is 0.6IU•g-1, and The brightness of the bleached pulp could reach 87.8%ISO, the color reversion value 0.016, viscosity 764mL•g-1. It was 2.9%ISO higher in brightness, 59mL•g-1 higher in viscosity, but the color reversion value is only 30.2% of the later, compared to the pulp without xylanase pretreatment.