Urea/NaOH system for enhancing the removal of hemicellulose from cellulosic fibers
Urea/NaOH system for enhancing the removal of hemicellulose from cellulosic fibers
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DOI：
10.1007/s10570-019-02587-7
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发表时间：
2019-07
期刊：
影响因子：
5.7
通讯作者：
Jianguo Li;Xi Liu;Qinghong Zheng;Lihui Chen;Liulian Huang;Y. Ni;Xinhua Ouyang
中科院分区：
文献类型：
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作者：
Jianguo Li;Xi Liu;Qinghong Zheng;Lihui Chen;Liulian Huang;Y. Ni;Xinhua Ouyang
从纤维素纤维中分离/去除半纤维素对于制造高纯度纤维素（溶解纸浆）至关重要。在本通讯中，使用尿素和NaOH的组合系统进行了研究，以提高半纤维素从针叶木亚硫酸盐溶解浆的分离/去除。尿素/NaOH处理显著提高了半纤维素的去除。在1%尿素浓度和5%NaOH浓度下，所得纸浆的半纤维素含量从11.22%降低到3.99%，与对照NaOH处理（在其他相同条件下不添加尿素）的6.56%相比。因此，经尿素/NaOH处理的纸浆的α-纤维素含量高于来自对照NaOH处理的α-纤维素含量（分别为96.02%和93.94%）。此外，尿素/NaOH工艺在去除半纤维素方面更具选择性。将讨论尿素/NaOH工艺性能改善的潜在机制。
Hemicellulose separation/removal from cellulosic fibers is critical for manufacturing high-purity cellulose (dissolving pulp). In this communication, a combined system of using both urea and NaOH was studied to enhance the separation/removal of hemicellulose from a softwood sulfite dissolving pulp. The urea/NaOH treatment significantly improves the hemicellulose removal. With a 1% urea concentration and 5% NaOH concentration, the hemicellulose content of resultant pulp decreased from 11.22 to 3.99%, which was compared to 6.56% of the control NaOH treatment (without the addition of urea under otherwise the same conditions). Consequently, the alpha-cellulose content of the urea/NaOH-treated pulp was higher than that from the control NaOH treatment (96.02% and 93.94%, respectively). Additionally, the urea/NaOH process was more selective in terms of removing hemicellulose. The underlying mechanism to account for the improved performance of the urea/NaOH process will be discussed.