在木质素脱木素和漂白过程中，从桉树和白杨树中解开木质素的命运,ChemSusChem

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在木质素脱木素和漂白过程中，从桉树和白杨树中解开木质素的命运
ChemSusChem ( IF 7.5 ) Pub Date : 2019-02-05 , DOI: 10.1002/cssc.201802592
Hanmin Wang ₁ , Bing Wang ₁ , Dan Sun ₁ , Quentin Shi ₂ , Lu Zheng ₂ , Shuangfei Wang ₃ , Shijie Liu ₄ , Ruirui Xia ₅ , Runcang Sun ₁

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木质纤维素的高效解构对于生物炼制业至关重要，因为木质素结构在木质素的高附加值转化中起着至关重要的作用。在这项研究中，提出了一种基于水热预处理（HTP）和牛皮纸脱木素作用的集成工艺来解构木质纤维素生物质。结果发现，HTP不仅促进了木糖寡糖的产生，而且还减少了随后的木质素去除过程中的化学药品用量。通过NMR光谱和凝胶渗透色谱法研究了从整合过程中获得的木质素的结构特征。此外，从不同原料中分离出的双酶木质素（DELs）被用作“模型木质素”，以描述木质素在H ₂期间的结构转变。O ₂，ClO ₂和O ₃漂白。在ClO ₂漂白过程中观察到木质素结构的重大变化，包括芳环的降解，对羟基苯酚单元的富集和羧基的增加。漂白木质素的结构特征比较表明，HTP有益于随后的漂白过程。在解构和脱木质素过程中增强木质素化学知识可以为当前的木质纤维素生物炼制提供有价值的见解。

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Unraveling the Fate of Lignin from Eucalyptus and Poplar during Integrated Delignification and Bleaching

Efficient deconstruction of lignocellulose is vitally important for the biorefinery industry because lignin structures play a crucial role in the high value‐added conversion of lignin. In this study, an integrated process based on hydrothermal pretreatment (HTP) and Kraft delignification was proposed to deconstruct lignocellulosic biomass. It was found that the HTP not only facilitated the production of xylo‐oligosaccharides but also reduced the chemicals dosage of the following delignification. The structural characteristics of lignin obtained from the integrated process were investigated by NMR spectroscopy and gel‐permeation chromatography. Additionally, double enzymatic lignins (DELs) isolated from different feedstocks were used as “model lignin” to delineate the structural transformations of lignin during H₂O₂, ClO₂, and O₃ bleaching. Significant changes of the lignin structure were observed during the ClO₂ bleaching process, including degradation of aromatic rings, enrichment in p‐hydroxyphenyl units, and increase of carboxylic groups. A comparison of the structural characteristics of the bleached lignins indicated that HTP benefited the subsequent bleaching process. Enhanced knowledge of lignin chemistry during deconstruction and delignification could provide valuable insight into the current lignocellulose biorefinery.

更新日期：2019-02-05

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