Investigation of eucalyptus kraft pulp brightness stability

被引：0
|
作者：
Eiras, KMM [1 ]
Colodette, JL [1 ]
机构：
[1] Univ Fed Vicosa, Dept Engn Florestal, BR-36570000 Vicosa, MG, Brazil
来源：
JOURNAL OF PULP AND PAPER SCIENCE | 2005年 / 31卷 / 01期
关键词：
kraft pulps; eucalyptus; brightness; color reversion; oxygen; delignification; bleaching; multistage process; bleached pulps; reducing end groups; uronic acids; carboxyl groups;
D O I：
暂无
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：
Brightness stability was evaluated in oxygen-delignified eucalyptus kraft pulps, fully bleached (90-90.5% ISO) by the sequences (DC) (PO)DD, (DC)(PO)DP D(PO)DD, D(PO)DP D-HT(PO)DD, D-HT(PO)DP, A(HT)/D(PO)DD and A(HT)/D(PO)DP by running heat-reversion tests with 20 repetitions for each sequence. A final P stage improved brightness stability. Some reducing groups present in the fully bleached pulps are likely the major cause of reversion. Pulp bleached with the sequence (DC)(PO)DD had low brightness stability despite containing only trace amounts of hexenuronic acids and lignin. Hot acid/hot chlorine dioxide stages improved pulp brightness stability, but only in sequences without a final P stage. The reversion profile across the bleaching sequences showed a trend toward increased pulp brightness stability after alkaline stages and decreased brightness stability after acid stages.
引用
收藏
页码：13 / 18
页数：6
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