H_2O_2低温加压漂白OCC纸浆的探讨

Discussion on the Low Temperature Pressure H_2O_2 Bleaching of OCC Pulp

H2O2漂白OCC纸浆主要是为了适度提高纸浆的白度、改善纸浆的色度,为后续生产添加染料提供基础。但是,在较高的温度下漂白OCC纸浆会加速H2O2与金属离子及其他杂质的作用,溶出木素和其它填充物、产生发色基团、引起H2O2的无效分解,影响漂白效果。研究发现:OCC纸浆在较低温度体系中进行H2O2漂白,反应的速率相对较低、漂白效果不明显,但是可以有效地阻止金属离子及高温的影响,降低纤维的损失;为了达到理想的漂白效果,提高漂白效率,通过在反应釜中引入惰性气体进行加压漂白处理,在较低温度体系下完全可以实现理想的漂白效果和改善色度的要求,并且明显的减少了H2O2的无效分解对漂白体系的影响。

Hydrogen peroxide bleaching OCC pulp is mainly in order to improve the whiteness of pulp, moderately improve the shade of the pulp, add dye provides the basis for subsequent production. However, OCC pulp bleaching will accelerate hydrogen peroxide under high temperature and the role of metal ions and other impurities, dissolution lignin and other fillers, produce the chromophores, cause the invalid decomposition of hydrogen peroxide, bleaching effect. ＂ihe study found that OCC pulp in the low temperature system of hydrogen peroxide bleaching, reaction rate is relatively low, bleaching effect is not obvious, but it can effectively prevent metal ion and the influence of high temperature, reduce the yield of fiber; In order to achieve the ideal effect of bleaching, improve the efficiency of bleaching, the article introduces the inert gas in the reaction kettle pressurized bleaching processing, under the low temperature system can achieve the bleaching effect and improve chromaticity, and significantly reduce invalid decomposition of hydrogen peroxide bleaching system impact.