On the role of carbohydrates in oxygen delignification

被引:4
作者
Wedin, H [1 ]
Lindström, ME
Ragnar, M
机构
[1] Royal Inst Technol, Dept Fibre & Polymer Technol, KTH, SE-10044 Stockholm, Sweden
[2] Kvaerner Pulping AB R&D, SE-65115 Karlstad, Sweden
关键词
oxygen delignification; carbohydrates; cellulose; hemicellulose; xylan; glucomannan; kappa number; holocellulose; bleached kraft pulp; cotton linters; brightness; yellowing tendency;
D O I
10.3183/npprj-2005-20-04-p448-452
中图分类号
TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];
学科分类号
0805 ; 080502 ; 0822 ;
摘要
The decrease in efficiency of the oxygen delignification of chemical pulps at low kappa numbers has been investigated. In order to study the role of the carbohydrates, five different fully bleached pulps were oxygen delignified and carefully analysed. The results show that no permanganate-consuming structures were formed in the carbohydrates during oxygen delignification, but that small amounts of lignin are slowly degraded. Unexpectedly, the ISO brightness was significantly increased, while the yellowing tendency was reduced, in some cases dramatically, making a final oxygen delignification treatment after a bleaching sequence an interesting option for market pulp producers with yellowing problems.
引用
收藏
页码:448 / 452
页数:5
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