【摘要】 对深度脱木素竹浆氧脱木素的影响因素进行了研究。结果表明,影响深度脱木素竹浆氧脱木素的工艺参数有用碱量、温度、反应时间、氧气压力和MgSO4用量。从氧脱木素后竹浆卡伯值和黏度的变化考虑,深度脱木素竹浆氧脱木素的最佳工艺条件为:用碱量3%,温度90℃,反应时间80 min,氧压0.5 MPa,MgSO4用量0.5%。在此最佳工艺条件下进行氧脱木素,漂后竹浆具有较低的卡伯值和较高的黏度。研究结果也表明,深度脱木素竹浆氧脱木素,木素脱除率和黏度降低率都随着原浆卡伯值的降低逐渐减小。对于深度脱木素竹浆而言,应先以最佳蒸煮工艺条件蒸煮得到较低卡伯值竹浆,再进行氧脱木素漂白较适宜。与常规硫酸盐法竹浆相比,深度脱木素竹浆具有更好的氧脱木素效果,氧脱木素选择性更高。更多还原

【Abstract】 The factors affecting oxygen delignification of bamboo EMCC pulp were studied.The results indicated that alkali charge,temperature,time,oxygen pressure and MgSO₄ charge were the affecting factors.The optimal oxygen delignification conditions of bamboo EMCC pulp were NaOH charge of 3%,temperature of 80℃, time of 80min,oxygen pressure of 0.5MPa and MgSO₄ charge of 0.5%.The delignification rate of bamboo EMCC pulp was high without significant loss of pulp viscosity in the conditions.The results also showed that the delignification rate and the reduction rate of viscosity decreased as the Kappa number of bamboo EMCC pulp decreased.It was suitable for bamboo EMCC pulp that the bamboo pulp with lower Kappa number was produced with optimal cooking conditions and followed by oxygen delignification of bamboo EMCC pulp.The EMCC bamboo pulp had higher oxygen delignification selectivity compared with the conventional kraft bamboo pulp.更多还原