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1. 发明授权

US5415734A Process for bleaching pulp without using chlorine containing chemicals 失效
标题翻译：不含氯化学品漂白纸浆的方法
公开(公告)号：US5415734A
公开(公告)日：1995-05-16
申请号：US59404
申请日：1993-05-11
申请人： Ake Backlund , Stig Andtbacka , Bjorn Dillner
发明人： Ake Backlund , Stig Andtbacka , Bjorn Dillner
IPC分类号： D21C9/10 , D21C9/153 , D21C9/16 , D21C9/147
CPC分类号： D21C9/1042 , D21C9/1057 , D21C9/153 , D21C9/163
摘要： A process is disclosed for bleaching pulp without chlorine containing chemicals and for greatly reducing total washing filtrate discharge, comprising the steps of: 1) sending pulp that has been subjected to continuous digestion, oxygen-delignification and then washing, through a washing press; 2) treating, with agitation, the delignified washed pulp with sulfuric acid and a chelating agent; 3) washing the pulp in a washing apparatus; 4) bleaching with hydrogen peroxide in a reaction vessel; 5) washing the hydrogen peroxide bleached pulp; 6) adding sulfuric acid and ozone with mixing of the pulp; 7) reacting the pulp with ozone in a reaction vessel; and 8) washing the ozone reacted pulp, wherein the majority of liquid filtrate from the bleaching process that is waste not to be recycled is drawn off from the washing apparatus of step 3, the washings in step 3 and 5 have at least 85% efficiency, filtrate from washing step 5 is recirculated to the washing apparatus of step 3, and filtrate from the washing apparatus of step 8 is recirculated and used in the washing apparatus for the washing of pulp after oxygen-delignification.
摘要翻译：公开了一种用于漂白纸浆而不含氯化学品的方法，并大大减少了洗涤滤液的总排出量，其中包括以下步骤：1）通过洗涤机送出经过连续消化，脱氧脱氧然后洗涤的纸浆; 2）在搅拌下用硫酸和螯合剂处理脱木素的洗浆; 3）在洗涤装置中洗涤纸浆; 4）在反应容器中用过氧化氢漂白; 5）洗涤过氧化氢漂白纸浆; 6）加入硫酸和臭氧混合纸浆; 7）在反应容器中使纸浆与臭氧反应; 和8）洗涤臭氧反应的纸浆，其中来自漂白过程的大部分液体滤液不需要再循环，从步骤3的洗涤装置中排出，步骤3和5中的洗涤液具有至少85％的效率将来自洗涤步骤5的滤液再循环到步骤3的洗涤装置，并且将来自步骤8的洗涤装置的滤液再循环并用于在脱氧脱氧后洗涤纸浆的洗涤装置。

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