低卡伯值麦草浆无氯漂白的研究

TCF Bleaching for the Low-Kappa-number Kraft Pulp of Wheat Straw

采用麦草硫酸盐法(KP法)一级蒸煮深度脱木素技术,制取低卡伯值麦草浆,并对其进行两种不同方式的无氯漂白。结果表明:AQ(PN)P流程可将浆料漂至白度86.2%(SBD),粘度为938mL/g。QZEYP流程能漂至86.9%(SBD),粘度为851mL/g。无氯漂白的粘度和白度稳定性均优于CEH三段漂。预处理对保护浆料有着重要作用。在过氧化氢漂白中,高温高压是脱木素和提高白度的必要条件。臭氧漂白是一种重要又经济的无氯漂白方法。

This study have investigated the TCF bleaching for low-Kappa-number kraft pulp of wheat straw by two different bleaching sequences, and the low-Kappa-number kraft pulp was produced by the one stage extending delignification technology. The results indicated that the brightness of bleached pulp could be achieved 86.2%, and/or 86.9% （SBD）, the viscosity of the pulp could be 938, and/or 851 mL/g after the AQ（PN）P, and/or QZEYP bleaching sequences, respectively. The viscosity and brightness stability were better than those of bleached pulp by CEH. The pretreatment is quite important stage for keeping high viscosity. The higher pressure and higher temperature are necessary for delignification and brightness during hydrogen peroxide bleaching. The ozone delignification is important and benefit for TCF bleaching.