论文部分内容阅读
氧脱木素作为制浆过程的继续已被普遍采用,但其却有一个主要的限制。由于氧脱木素选择性差和木素去除率超过50%时会使碳水化合物降解,进而将木素去除率限制在50%左右。过高的木素去除率也会损失纸浆的黏度和强度。本研究探讨了氧脱木素过程中H2O2作为添加剂与其他一些化学品(如MgSO4或有机磷酸盐)一起使用对降低卡伯值和提高氧脱木素选择性的效果。同时,也探讨了其对漂白化学品消耗量及成浆强度的影响。实验结果表明,有机磷酸盐非常有效,它提供了最佳的选择性,对从纸浆中去除过渡金属离子的选择性最好。
Oxygen delignification as a continuation of the pulping process has been widely used, but it has a major limitation. Due to poor oxygen delignification selectivity and lignin removal rates above 50%, carbohydrates are degraded and the lignin removal rate is limited to about 50%. Excessive lignin removal can also lose pulp viscosity and strength. This study explored the effect of using H2O2 as an additive along with some other chemicals (such as MgSO4 or organophosphates) during oxygen delignification to reduce kappa number and improve oxygen delignification selectivity. At the same time, it also explores its impact on bleaching chemicals consumption and pulp strength. The experimental results show that the organophosphates are very effective, provide the best selectivity, and have the best selectivity for removing transition metal ions from the pulp.