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Efficient fractionation of pure hemicellulose with high DP from bleached hardwood pulp using LiBr·3H2O and co-production of dissolving pulp
Green Chemistry ( IF 9.3 ) Pub Date : 2024-03-02 , DOI: 10.1039/d4gc00335g Runzhu Gong 1, 2 , Chao Liu 2 , Meiyan Wu 2 , Rui Tian 3 , Guang Yu 2 , Xitao Luo 2 , Bin Li 2, 4, 5 , Feng Peng 3 , Yanjun Tang 1
Green Chemistry ( IF 9.3 ) Pub Date : 2024-03-02 , DOI: 10.1039/d4gc00335g Runzhu Gong 1, 2 , Chao Liu 2 , Meiyan Wu 2 , Rui Tian 3 , Guang Yu 2 , Xitao Luo 2 , Bin Li 2, 4, 5 , Feng Peng 3 , Yanjun Tang 1
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Renewable hemicellulose with a unique structure exhibits a wide range of potential applications. However, it has been a formidable challenge to isolate hemicellulose with an intact structure from lignocellulosic materials. In this study, LiBr·3H2O (LBTH) was used as a green solvent for the effective fractionation of hemicellulose from bleached hardwood kraft pulp (BHKP) under mild conditions (25–85 °C). It was found that hemicellulose in BHKP can be dissolved in LBTH with ease and high selectivity owing to the breaking of hydrogen bonds between hemicellulose and cellulose, and the dissolved hemicellulose can be regenerated with a high degree of polymerization (DP) in the range of 240–264 using ethanol precipitation. The highest removal rate of hemicellulose from BHKP was as high as 95.2%, and the corresponding yield of pure hemicellulose reached 84.3%. Moreover, simultaneously obtained undissolved cellulose pulp through LBTH treatment had a high content of α-cellulose (96.7%), high DP (880), and trace levels of Fe (2 ppm), which met the standard requirement for dissolving pulp for the production of lyocell. In addition, LBTH can be easily recycled to guarantee a green and sustainable process. This work provides a new approach for highly selective fractionation of hemicellulose and cellulose from commercial BHKP based on an efficient and environmentally friendly LBTH treatment, which could be very promising for better valorization of hemicellulose and cellulose in many advanced applications.
中文翻译：
利用LiBr·3H2O从漂白阔叶木浆中高效分馏高DP纯半纤维素并联产溶解浆
具有独特结构的可再生半纤维素具有广泛的潜在应用。然而，从木质纤维素材料中分离出具有完整结构的半纤维素一直是一项艰巨的挑战。在本研究中，LiBr·3H 2 O (LBTH) 被用作绿色溶剂，在温和条件（25–85 °C）下从漂白硬木牛皮纸浆（BHKP）中有效分离半纤维素。研究发现，由于半纤维素和纤维素之间氢键的断裂，BHKP中的半纤维素可以轻松且高选择性地溶解在LBTH中，并且溶解的半纤维素可以再生，具有240范围内的高聚合度（DP） –264 使用乙醇沉淀。BHKP中半纤维素的最高去除率高达95.2%，相应的纯半纤维素收率达到84.3%。而且，经LBTH处理同时得到的不溶纤维素浆，α-纤维素含量高（96.7%），DP高（880），微量Fe（2 ppm），满足生产溶解浆的标准要求。莱赛尔纤维。此外，LBTH可以轻松回收，以保证绿色和可持续的过程。这项工作提供了一种基于高效且环保的 LBTH 处理从商业 BHKP 中高度选择性分离半纤维素和纤维素的新方法，这对于在许多先进应用中更好地提高半纤维素和纤维素的价值非常有前景。
更新日期：2024-03-02
中文翻译：
利用LiBr·3H2O从漂白阔叶木浆中高效分馏高DP纯半纤维素并联产溶解浆
具有独特结构的可再生半纤维素具有广泛的潜在应用。然而，从木质纤维素材料中分离出具有完整结构的半纤维素一直是一项艰巨的挑战。在本研究中，LiBr·3H 2 O (LBTH) 被用作绿色溶剂，在温和条件（25–85 °C）下从漂白硬木牛皮纸浆（BHKP）中有效分离半纤维素。研究发现，由于半纤维素和纤维素之间氢键的断裂，BHKP中的半纤维素可以轻松且高选择性地溶解在LBTH中，并且溶解的半纤维素可以再生，具有240范围内的高聚合度（DP） –264 使用乙醇沉淀。BHKP中半纤维素的最高去除率高达95.2%，相应的纯半纤维素收率达到84.3%。而且，经LBTH处理同时得到的不溶纤维素浆，α-纤维素含量高（96.7%），DP高（880），微量Fe（2 ppm），满足生产溶解浆的标准要求。莱赛尔纤维。此外，LBTH可以轻松回收，以保证绿色和可持续的过程。这项工作提供了一种基于高效且环保的 LBTH 处理从商业 BHKP 中高度选择性分离半纤维素和纤维素的新方法，这对于在许多先进应用中更好地提高半纤维素和纤维素的价值非常有前景。
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