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1. 发明授权

US3619350A Chlorine dioxide pulp bleaching system 失效
标题翻译：氯化二氧化碳漂白系统
公开(公告)号：US3619350A
公开(公告)日：1971-11-09
申请号：US3619350D
申请日：1969-07-11
申请人： RICHARD MARCHFELDER
发明人： MARCHFELDER RICHARD
IPC分类号： D21C9/14 , D21C
CPC分类号： D21C9/14
摘要： A chlorine dioxide bleaching process is disclosed that improves the efficiency of bleaching paper, reduces the consumption of chemicals, water and heat, and minimizes waste disposal problems. The essential feature of the invention is a two-stage system for generating chlorine dioxide in which partially spent chemicals discharged from the primary generation stage are more completely reacted under controlled conditions in a dechlorination stage. Since chlorine dioxide solution from the dechlorinator is somewhat contaminated, it is separately collected for use in the early pulp chlorination stages while the purer chlorine dioxide from the primary generator is reserved for use in the latter stages of pulp bleaching. The chloride content and corrosiveness of the spent reagents are minimized by this process which not only provides for economical utilization of the chemicals but also makes it feasible to add the underflow from the dechlorinator to the black liquor recovery system and so increase the recovery of sulfides. Waste disposal problems and the consumption of water are minimized by recycling free acid from the dechlorinator to the generator and by utilizing the filtrate from the last stages of pulp washing as the absorption media in the chlorine dioxide absorption towers.

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