Combination of mechanical, alkaline and enzymatic treatments to upgrade paper-grade pulp to dissolving pulp with high reactivity

被引:50
作者
Duan, Chao [1 ,2 ]
Verma, Saurabh Kumar [2 ,3 ]
Li, Jianguo [1 ,2 ]
Ma, Xiaojuan [2 ,4 ]
Ni, Yonghao [1 ,2 ]
机构
[1] Tianjin Univ Sci & Technol, Tianjin Key Lab Pulp & Paper, Tianjin 300457, Peoples R China
[2] Univ New Brunswick, Limerick Pulp & Paper Ctr, Fredericton, NB E3B 5A3, Canada
[3] Indian Inst Technol, Dept Chem, Gauhati 781039, India
[4] Fujian Agr & Forestry Univ, Coll Mat Engn, Fuzhou 350002, Peoples R China
关键词
Mechanical refining; Cold caustic extraction; Paper-grade pulp; Dissolving pulp; Reactivity; VISCOSE RAYON PRODUCTION; ACCESSIBILITY; CELLULOSE; PRETREATMENT; REMOVAL;
D O I
10.1016/j.biortech.2015.10.067
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
A modified process consisting of an initial mechanical refining (R) followed by a low-alkali (5.5% NaOH) cold caustic extraction (CCE) and finally an endoglucanase (EG) treatment (R-5.5% CCE-EG) was investigated for upgrading paper-grade pulp to dissolving pulp. Results showed that compared to the conventional process (9% CCE-EG), the modified process can decrease the alkali concentration (from 9% to 5.5%) to achieve a similar hemicelluloses removal while simultaneously enhancing the Fock reactivity (from 62.2% to 81.0%). The improved results were due to the fact that the mechanical refining resulted in favorable fiber morphological changes, including increased pore volume/size, water retention value and specific surface area. Consequently, the hemicelluloses removal was enhanced even under the subsequent low-alkali CCE condition. A synergic effect of refining, low alkali concentration and enzymatic activation was responsible for the higher reactivity of resulting dissolving pulp. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:458 / 463
页数:6
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