蔗渣浆ECF短序漂白流程的对比  

Comparison of ECF Short-Sequence Bleaching Processes for Bagasse Pulp

作　　者：李军[1] 何水淋[1] 李智[1] 徐峻[1] 莫立焕[1] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2014年第2期14-20,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家“973”计划项目(2010CB732205);华南理工大学制浆造纸工程国家重点实验室开放基金资助项目(201356)

摘　　要：对典型的蔗渣浆无元素氯(ECF)短序漂白流程D0EpD、OpDEp及OpD进行了对比,探讨了二氧化氯脱木素(D0)与过氧化氢强化氧脱木素(Op)的脱木素效率差异及对后续漂白的影响,并分析了漂白过程中可吸附有机卤化物(AOX)的产生量和各漂白流程的直接化学品成本.结果表明:D0段脱木素选择性好,ClO2用量为0.8%时脱木素率即达40%以上,且用量越高脱木素作用越强;Op段在脱出纸浆中残余木素的同时能大幅提升纸浆白度,纸浆白度明显高于D0浆;相同后续漂白化学品用量下,OpDEp漂后浆白度高于D0EpD漂后浆白度,且比OpD漂后浆白度约高12个百分点;相同纸浆白度下,OpDEp漂白过程中产生的可吸附有机卤化物总量约为D0EpD的50%,其直接化学品成本比后者低约40.00元/t,具有更好的环境、经济效益.In this paper,first,three typical element chlorine-free （ECF）short-sequence bleaching processes, namely D0 EpD,OpDEp and OpD,were comparatively investigated.Then,the difference in delignification rate be-tween the chlorine dioxide delignification （D0 ）and the peroxide-reinforced oxygen delignification （Op ）was re-vealed,and the effect of pre-delignification on the subsequent bleaching was analyzed.Finally,the AOX （Absor-bable Organic Halides）emission and the direct chemical cost during the bleaching were discussed.The results in-dicate that （1 ）D0 possesses high delignification selectivity;for instance,the delignification rate reaches 40%at a ClO2 dosage of only 0.8%and continuously increases with ClO2 dosage;（2）Op can not only delignify the residual lignin in pulp but also remarkably improve the pulp brightness to a value much higher than that of D0 pulp;（3 ） OpDEp bleaching is more effective than D0 EpD bleaching at the same chemical dosage in the subsequent bleaching because it may result in higher pulp brightness;（4）the final brightness of OpDEp bleached pulp is about 12 per-centage points higher than that of OpD bleached pulp;and （5 ）at the same pulp brightness,the AOX emitted du-ring the OpDEp bleaching is only about half of that emitted during the D0 EpD bleaching,and the direct chemical cost of OpDEp bleached pulp is 40.00 Yuan/t lower than that of D0 EpD bleached pulp,which means that OpDEp bleaching is of higher environmental and economic benefits.

关 键 词：蔗渣浆 ECF短序漂白 二氧化氯脱木素 过氧化氢强化氧脱木素 可吸附有机卤化物 直接化学品成本 

分 类 号：TS745[轻工技术与工程—制浆造纸工程]