Enhanced removal of hemicelluloses from cellulosic fibers by poly(ethylene glycol) during alkali treatment
Enhanced removal of hemicelluloses from cellulosic fibers by poly(ethylene glycol) during alkali treatment
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DOI：
10.1007/s10570-015-0800-2
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发表时间：
2016-02
期刊：
影响因子：
5.7
通讯作者：
Jianguo Li;Xiaojuan Ma;Chao Duan;Yishan Liu;Hongjie Zhang;Y. Ni
中科院分区：
文献类型：
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作者：
Jianguo Li;Xiaojuan Ma;Chao Duan;Yishan Liu;Hongjie Zhang;Y. Ni
提高纤维素纤维中半纤维素的去除率对于生产高纯度纤维素具有决定性的重要性。在这项研究中，聚（乙二醇）（PEG）添加到冷碱提取（CCE）过程中，以促进从针叶木亚硫酸盐溶解浆中去除半纤维素。在所研究的条件下，半纤维素的含量从原始样品中的11.4%显著降低到PEG/CCE处理样品中的5.3%。PEG添加的这种积极结果可以通过以下来解释：（1）NaOH向内渗透和扩散到纤维结构中的改善以及半纤维素从纤维结构向外扩散到本体相，以及（2）由于在纤维壁中包含PEG和NaOH扩散的改善而增强的纤维溶胀。此外，PEG/CCE处理对纤维壁中的半纤维素分布和所得纸浆中残留半纤维素的分子量的影响进行了研究。
Enhancing removal of hemicelluloses from cellulosic fibers is of decisive importance for producing high-purity cellulose. In this study, poly(ethylene glycol) (PEG) was added to a cold caustic extraction (CCE) process to promote removal of hemicelluloses from a softwood sulfite dissolving pulp. The content of hemicelluloses was considerably decreased from 11.4 % in the original sample to 5.3 % in the PEG/CCE-treated sample under the studied conditions. This positive result of PEG addition can be explained by (1) improved inward penetration and diffusion of NaOH into the fiber structure and outward diffusion of hemicelluloses from the fiber structure to the bulk phase, and (2) enhanced fiber swelling due to inclusion of PEG in the fiber walls and improved NaOH diffusion. Moreover, the effects of PEG/CCE treatment on the distribution of hemicelluloses in the fiber walls and the molecular weight of the residual hemicelluloses in the resulting pulp were investigated.