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2. 发明授权

US4938842A High consistency peroxide bleaching 失效
标题翻译：高度稠度的过氧化物漂白
公开(公告)号：US4938842A
公开(公告)日：1990-07-03
申请号：US392626
申请日：1989-02-23
申请人： Philip Whiting , Adele M. Rhodes , Arnold E. Willoughby , Martin G. Fairbank , Hollis D. MacEwen , Fraser McLellan
发明人： Philip Whiting , Adele M. Rhodes , Arnold E. Willoughby , Martin G. Fairbank , Hollis D. MacEwen , Fraser McLellan
IPC分类号： D21C9/16
CPC分类号： D21C9/163
摘要： A process is provided for the bleaching of wood pulp with hydrogen or sodium peroxide. The process includes the steps of adding to a wood pulp a bleach liquor having an effective amount of hydrogen or sodium peroxide bleaching agent and, by weight of the diluted wood pulp, 0.5 to 6% sodium hydroxide, 0 to 5% sodium silicate, 0 to 1%, preferably 0.02 to 0.05%, magnesium sulphate, and a chelating agent in an amount sufficient to sequester heavy metal ions in the pulp, to produce a pulp consistency of 1 to 16% at a temperature in the range of the bleach liquor freezing point to 25.degree. C., uniformly mixing the bleach liquor with the wood pulp, and immediately thickening the diluted wood pulp to a consistency in the range of 20 to 70% for bleaching of the thickened wood pulp. The wood pulp can be subjected to a preliminary treatment by the addition of a chelating agent in an amount sufficient to sequester chelatable heavy metals including manganese at a pulp consistency of 1 to 10%, and dewatering said pulp to a consistency of 20 to 70% to remove the sequestered manganese to less than 10 ppm.
摘要翻译：提供了用氢或过氧化钠漂白木浆的方法。该方法包括以下步骤：向木浆中加入具有有效量的氢或过氧化钠漂白剂的漂白液，按稀释木浆重量计，0.5-6％氢氧化钠，0-5％硅酸钠，0 至1％，优选0.02至0.05％的硫酸镁和螯合剂，其量足以螯合纸浆中的重金属离子，以在漂白液的范围内的温度下产生1至16％的纸浆浓度凝固至25℃，将漂白液与木浆均匀混合，并立即将稀释的木浆增稠至20至70％的稠度，以使漂白的木浆变得漂白。木浆可以通过添加螯合剂进行初步处理，所述螯合剂的用量足以将纸浆稠度为1至10％的可螯合的重金属（包括锰）螯合，并将所述纸浆脱水至20至70％将隔离锰除去至少于10ppm。

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