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1. 发明授权

US5223091A Method of brightening mechanical pulp using silicate-free peroxide bleaching 失效
标题翻译：使用无硅酸盐过氧化物漂白增亮机械纸浆的方法
公开(公告)号：US5223091A
公开(公告)日：1993-06-29
申请号：US796951
申请日：1991-11-25
申请人： Bernard H. Hetzler , Donald T. Eadie , James K. Turnbull
发明人： Bernard H. Hetzler , Donald T. Eadie , James K. Turnbull
IPC分类号： D21C9/00 , D21C9/16
CPC分类号： D21C9/004 , D21C9/163
摘要： A method of brightening mechanical pulps by chelating and thickening to reduce the manganese content of the pulp to less than 30 parts per million and copper content less than 1 parts per million by adding ions preferably magnesium ions as magnesium sulphate MgSO.sub.4 in the amount of 400 to 3,000 ppm Mg ions retained by the pulp based on the oven dry weight of the pulp and thereafter applying a bleaching liquor composed of peroxide as hydrogen peroxide and an alkali as sodium hydroxide having a ratio of alkali to peroxide of between 1--1 and 2-1 in an amount to apply between 1 to 8 percent peroxide based on the oven dry weight of the pulp and containing no added sodium silicate. Preferably the bleaching liquor will contain magnesium sulphate in the amount of about 0.001 to 0.1% based on the oven dry weight of the pulp. The treated pulp is bleached in a bleaching tower for a sufficient time to obtain the desired degree of brightening and thereby produce a pulp having a brightness at least equivalent to that obtained by bleaching using a silicate stabilized bleaching liquor and the equivalent amount of peroxide.
摘要翻译：通过螯合和增稠来增加机械纸浆的方法，通过将离子优选镁离子作为硫酸镁MgSO 4，以400至500的量添加离子，将纸浆中的锰含量降低到百万分之30以下，铜含量低于百万分之1 基于纸浆的烘箱干重，由纸浆保留的3,000ppm Mg离子，然后将由过氧化物组成的漂白液作为过氧化氢和碱为碱金属与过氧化物的比例为1-1〜2- 1的量适用于1至8％的过氧化物，基于纸浆的干燥干重并且不加入硅酸钠。优选地，基于纸浆的烘箱干重，漂白液将含有约0.001至0.1％的硫酸镁。将经处理的纸浆在漂白塔中漂白足够的时间以获得所需的增亮度，从而产生至少与通过使用硅酸盐稳定的漂白液和等量的过氧化物漂白所获得的亮度相当的亮度的纸浆。

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