Using multistage models to evaluate how pulp washing after the first extraction stage impacts elemental chlorine-free bleach demand

B. Brogdon, L. Lucia
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Abstract

Steady-state models were constructed to predict the response of a southern U.S. softwood brown¬stock to three- and five-stage elemental chlorine-free (ECF) bleach sequences. The models provided insight into how typical (EO) washing efficiencies from a vacuum drum unit affected pulp brightening and total chlorine dioxide con¬sumption. When (EO) carryover was between 15% and 30%, the chlorine dioxide needed to reach target brightness increased by 8% to 15% for the D0(EO)D1(EP)D2 sequence (89% ISO) and by 15% to 23% for the D0(EO)D1 sequence (86% ISO) versus perfect washing. Use of (EO) filtrate as D0 shower water, such as in split-flow countercurrent wash¬ing, caused the bleach uptake to increase by 1.5 to 3.0 kg chlorine dioxide (ClO2)/ton pulp when compared to using cleaner D0 shower water sources. The ClO2 consumed by 15% to 30% (EO) washer carryover is comparable to that consumed by typical carryover levels from brownstock washing (~10 kg Na2SO4/ton pulp). High (EO) carryover made ECF bleaching to higher brightness targets more difficult.
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采用多阶段模型评价第一萃取阶段后的纸浆洗涤对单质无氯漂白剂需求的影响
建立了稳态模型来预测美国南部软木棕色砧木对三级和五级无氯(ECF)漂白剂序列的反应。这些模型深入了解了真空转鼓装置的典型(EO)洗涤效率如何影响纸浆增白和二氧化氯总消耗。当(EO)残留在15%至30%之间时,与完美洗涤相比,D0(EO)D1(EP)D2序列(89% ISO)达到目标亮度所需的二氧化氯增加了8%至15%,D0(EO)D1序列(86% ISO)增加了15%至23%。使用(EO)滤液作为D0淋浴水,例如在分流逆流洗涤中,与使用更清洁的D0淋浴水源相比,每吨纸浆的漂白剂吸收量增加了1.5至3.0公斤二氧化氯(ClO2)。15%至30% (EO)洗涤残留所消耗的二氧化氯与褐煤洗涤的典型残留水平(~10 kg Na2SO4/吨纸浆)所消耗的二氧化氯相当。高(EO)残留使得ECF漂白到高亮度目标更加困难。
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