CAJ | 학술논문

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．
대전형적자사장무원소록（ECF）단서표백류정D0 EpD、OpDEp급OpD진행료대비，탐토료이양화록탈목소（D0）여과양화경강화양탈목소（Op ）적탈목소효솔차이급대후속표백적영향，병분석료표백과정중가흡부유궤서화물（AOX）적산생량화각표백류정적직접화학품성본．결과표명：D0단탈목소선택성호，ClO2용량위0．8％시탈목소솔즉체40％이상，차용량월고탈목소작용월강；Op단재탈출지장중잔여목소적동시능대폭제승지장백도，지장백도명현고우D0장；상동후속표백화학품용량하，OpDEp표후장백도고우D0EpD표후장백도，차비OpD표후장백도약고12개백분점；상동지장백도하，OpDEp표백과정중산생적가흡부유궤서화물총량약위D0 EpD적50％，기직접화학품성본비후자저약40.00원/t，구유경호적배경、경제효익．
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.