整合脱木素过程中蔗渣中木质素结构变化和潜力的见解,ACS Sustainable Chemistry & Engineering

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整合脱木素过程中蔗渣中木质素结构变化和潜力的见解
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-06-21 00:00:00 , DOI: 10.1021/acssuschemeng.9b02071
Han-Min Wang ₁ , Yong-Chang Sun ₂ , Bing Wang ₁ , Dan Sun ₁ , Quentin Shi ₃ , Lu Zheng ₃ , Shuang-Fei Wang ₄ , Shi-Jie Liu ₅ , Rui-Rui Xia ₆ , Run-Cang Sun _{1,

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Affiliation

充分利用木质纤维素对目前的生物炼制企业具有重要意义。木质素作为一种天然的高分子聚合物，具有可再生原料生产增值产品的巨大潜力。在本研究中，采用热液预处理（HTP）和碱脱木素相结合的集成工艺来分离甘蔗渣。HTP过程主要促进了半纤维素向木糖寡糖（XOS）的转化，随后在低碱性剂量下实现了底物的脱木质素。另外，源自整合过程的木质素级分是全面的，并通过NMR和GPC技术对其结构进行了阐明。此外，漂白过程（H ₂ O ₂，ClO根据从蔗渣分离的DEL（双酶促木质素）探索了木质素结构上的图₂和O ₃）。观察到ClO ₂漂白导致木质素明显解聚并增加对-羟基苯基单元，这表明ClO ₂漂白在脱木质素过程中更有效。此外，Py-GC / MS还用于评估在集成过程中分离出的木质素的热解产物。从甘蔗渣木质素中产生了大量的乙烯基酚类化合物，这为木质素在乙烯基酚类的生产中提供了有利的潜力。

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Insights into the Structural Changes and Potentials of Lignin from Bagasse during the Integrated Delignification Process

Making full use of the lignocellulose is of great significance to the current biorefinery enterprises. As a natural macromolecule polymer, lignin has a prominent potential as renewable feedstock to produce value-added products. In the present study, the integrated process combined hydrothermal pretreatment (HTP) and alkaline delignification was adopted to dissociate bagasse. The HTP process primarily promoted the conversion of hemicelluloses into xylo-oligosaccharides (XOS), and the subsequent delignification of substrates was achieved under low-alkaline dosage. Additionally, the lignin fractions originated from the integrated process were comprehensive and structurally elucidated via the NMR and GPC techniques. Furthermore, the effects of the bleaching processes (H₂O₂, ClO₂, and O₃) on the structures of lignin were explored based on the DEL (double enzymatic lignin) isolated from bagasse. It was observed that ClO₂ bleaching led to the obvious depolymerization of lignin and augment in p-hydroxyphenyl units, implying that ClO₂ bleaching was more efficient in the delignification process. Moreover, Py-GC/MS was also applied to evaluate pyrolytic products of the lignins isolated during the integrated process. Significant amounts of vinyl phenolic compounds were produced from the bagasse lignins, which presented a favorable potential for the lignins in the production of vinyl phenolics.

更新日期：2019-06-21

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