Chlorine dioxide bleaching of nineteen non-wood plant pulps

被引：10
|
作者：
Ferdous, Taslima [2 ]
Quaiyyum, M. A. [2 ]
Jahan, M. Sarwar [1 ]
机构：
[1] Bangladesh Council Sci & Ind Res, Pulp & Paper Res Div, Dr Qudrat I Khuda Rd, Dhaka 1205, Bangladesh
[2] Univ Dhaka, Dept Appl Chem & Chem Engn, Dhaka 1000, Bangladesh
来源：
NORDIC PULP & PAPER RESEARCH JOURNAL | 2020年 / 35卷 / 04期
关键词：
brightness; elemental chlorine free bleaching; hexeneuronic acid; kappa number; non-wood pulps; KRAFT PULP; AOX FORMATION; RICE STRAW; ACID; HOT; HARDWOOD; STAGE; DELIGNIFICATION; OPTIMIZATION; IMPACT;
D O I：
10.1515/npprj-2020-0043
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：
Bleaching of unbleached and oxygen delignifled pulps from nineteen non-wood plants has been evaluated in elemental chlorine free bleaching. Chlorine dioxide charge (kappa factor 0.15, 0.20 and 0.25) and temperature (70 and 85 degrees C) in the delignification stage (D) were varied. Chlorine dioxide (ClO2) charge and temperature exhibited lower kappa number and higher brightness after alkaline extraction (EP) stage. High temperature ClO2 delignification (D-HT) exhibited higher final pulp brightness. The final brightness of wheat straw pulp reached to 90 % after D-0/D-HT (EP)D-1 bleaching, while banana pseudo stem pulp showed the worst bleachability. Residual hexeneuronic acid contents in final pulp from most of the nonwood plants were lower and exhibited 1-2 % higher pulp brightness in D-HT process than D-0 process. Oxygen delignified pulp and D-HT process discharged lower COD load.
引用
收藏
页码：569 / 576
页数：8
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