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BLEACHING PROCESS FOR PAPER PULP WITH SUPPLEMENTARY ADDITION OF ALKALINE HYDROGEN PEROXIDE WHEN BETWEEN 60 AND 85WT OF THE ORIGINAL PEROXIDE HAS BEEN CONSUMED
BLEACHING PROCESS FOR PAPER PULP WITH SUPPLEMENTARY ADDITION OF ALKALINE HYDROGEN PEROXIDE WHEN BETWEEN 60 AND 85WT OF THE ORIGINAL PEROXIDE HAS BEEN CONSUMED
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机译:消耗60%至85WT%的原始过氧化物的纸浆加碱性过氧化氢的补充漂白工艺
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摘要
High-yield lignocellulosic wood pulps are bleached by (i) first pretreating such pulp with a complexing agent for metal ions and next washing the pretreated pulp, and then (ii) bleaching such pretreated/washed pulp with an initial amount of hydrogen peroxide in an alkaline medium, including adding a supplementary bleaching amount of hydrogen peroxide and a supplementary amount of an alkaline agent to the pulp over the course of the bleaching step (ii) without interrupting same, at a point in time when from 60% to 85% of the initial amount of hydrogen peroxide has been consumed, and such supplementary amount of hydrogen peroxide being equal to or less than the initial amount thereof.
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