公开(公告)号：US5853536A

公开(公告)日：1998-12-29

申请号：US718706

申请日：1996-09-27

申请人： Derek Hornsey ,  John Ayton ,  Michel Epiney ,  Gordon Homer

发明人： Derek Hornsey ,  John Ayton ,  Michel Epiney ,  Gordon Homer

IPC分类号： D21C9/12 ,  D21C9/14 ,  D21C9/153

CPC分类号： D21C9/144 ,  D21C9/153

摘要： A method of bleaching a pulp at low consistency employs chlorine dioxide and/or chlorine, to partially bleach the pulp. The aqueous partially bleached pulp flows along a sinuous flow path providing a high ratio of flow path of aqueous pulp to length of effective travel of the aqueous pulp. Ozone is introduced to the aqueous pulp at spaced apart locations in the flow path so that a low partial pressure of ozone is established in the flow path which favors chemical oxidation of the lignin and low chemical attack on cellulose. In this way effective bleaching is achieved with reduced use of chlorine or chlorine dioxide and reduced production of chlorinated compounds.

摘要翻译： 以低浓度漂白纸浆的方法使用二氧化氯和/或氯来部分漂白纸浆。 含水部分漂白的纸浆沿着弯曲的流动路径流动，提供水浆的流动路径与水浆的有效行程的长度的高比率。 在流动路径中的间隔开的位置处将臭氧引入含水纸浆中，使得在流动路径中建立低分散的臭氧，这有利于木质素的化学氧化和对纤维素的低化学侵蚀。 以这种方式，通过减少使用氯或二氧化氯并减少氯化化合物的产生实现有效的漂白。