-
1.发明授权Method of bleaching high yield pulp by using dithionite ion and excluding oxygen 失效通过使用连二亚硫酸盐离子并排除氧来漂白高产量纸浆的方法
公开(公告)号：US4863564A
公开(公告)日：1989-09-05
申请号：US136975
申请日：1987-12-23
IPC分类号： D21C9/10
CPC分类号： D21C9/1089 , D21C9/1026
摘要： A method is described for increasing the brightness of reductively bleached high yield pulps, comprising bleaching the pulps with a reductive bleaching solution under anaerobic conditions and maintaining the bleached pulps under anaerobic conditions during all handling steps subsequent to bleaching, including paper formation, wet pressing, and drying of the paper formed therefrom. The bleached paper has higher brightness than the same paper produced under aerobic conditions, and the bleaching and handling-derived portion of this higher brightness is retained after storage of the finished paper.
摘要翻译： 描述了一种用于增加还原性漂白的高产量纸浆的亮度的方法，包括在厌氧条件下用还原性漂白溶液漂洗纸浆并在漂白之后的所有处理步骤期间将漂白纸浆保持在厌氧条件下，包括造纸，湿压， 并干燥由其形成的纸。 漂白纸具有比在有氧条件下生产的相同纸张更高的亮度，并且在保存成品纸之后保持这种较高亮度的漂白和处理衍生部分。
-
公开(公告)号：US4871423A
公开(公告)日：1989-10-03
申请号：US83202
申请日：1987-08-10
IPC分类号： D21C9/10
CPC分类号： D21C9/1047
摘要： Compositions and a method are disclosed for minimizing brightness reversion of chromophore-containing wood pulps, especially low-cellulose wood pulps, such as groundwood and thermomechanical pulps, which have been reductively bleached or bleached with hydrogen peroxide. Ascorbic acid and palmitoyl ascorbate are particularly effective for preventing such reversion at low levels.
摘要翻译： 公开了组合物和方法，用于使用含过氧化氢还原漂白或漂白的含发色团的木浆，特别是低木纤维素木浆（例如磨木浆和热机械纸浆）的亮度回复最小化。 抗坏血酸和棕榈酰抗坏血酸盐对于防止这种低水平的逆转特别有效。
-
搜索结果
2 条记录 (耗时 0.018 秒)
