中文摘要：

对典型的蔗渣浆无元素氯（ECF）短序漂白流程D0 EpD、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D0 EpD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．

英文摘要：

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.