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1. 发明申请

WO2010143997A1 METHOD FOR PRECIPITATING LIGNIN FROM BLACK LIQUOR BY UTILIZING WASTE GASES 审中-公开
标题翻译：通过使用废气来从黑液中提取木瓜的方法
公开(公告)号：WO2010143997A1
公开(公告)日：2010-12-16
申请号：PCT/SE2009/000291
申请日：2009-06-10
申请人： METSO POWER AB , LITTORIN, Anders , WALLMO, Henrik , NORBERG, Hanna , WIMBY, Martin
发明人： LITTORIN, Anders , WALLMO, Henrik , NORBERG, Hanna , WIMBY, Martin
IPC分类号： D21C11/04 , D21C11/00 , D21C11/08
CPC分类号： C07G1/00 , D21C11/0007 , D21C11/0085 , D21C11/04
摘要： The present invention relates to a method for separation of lignin from original black liquor comprising the following steps in sequence: a) Precipitation of lignin by a first acidification stage of the original black liquor, b) followed by dewatering while forming a first filter cake with high content of lignin, c) suspending the first lignin filter cake obtained in step b in a second acidification stage, d) whereupon a second lignin suspension is obtained, e) dewatering of the second lignin suspension forming a second filter cake with high content of lignin, f) washing the second filter cake water and finally, g) dewatering of the washed second lignin cake obtaining a lignin product. According to the invention is the waste gases emitted from the second acidification stage re-circulated and mixed with the original black liquor at the latest in the first acidification stage. By this recirculation is a waste gas disposal problem solved while also reducing the amount of fresh acidifier charged in the first acidification stage.
摘要翻译：本发明涉及一种从原始黑液中分离木质素的方法，其顺序包括以下步骤：a）通过原始黑液的第一酸化阶段沉淀木质素，b）随后脱水，同时形成第一滤饼，高含量的木质素，c）在第二酸化阶段中将步骤b中获得的第一木质素滤饼悬浮，d）由此得到第二木质素悬浮液，e）第二木质素悬浮液的脱水，形成具有高含量木质素，f）洗涤第二滤饼水，最后，g）洗涤的第二木质素饼脱水获得木质素产物。根据本发明，最初在第一酸化阶段从第二酸化阶段排出的废气与原来的黑液再循环混合。通过这种再循环是解决废气处理问题，同时还减少了在第一酸化阶段中加入的新鲜酸化剂的量。

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