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首页> 外文期刊>RSC Advances >Sequential solvent fractionation of lignin for selective production of monoaromatics by Ru catalyzed ethanolysis
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Sequential solvent fractionation of lignin for selective production of monoaromatics by Ru catalyzed ethanolysis

机译：ru催化乙酸盐选择性单芳烃选择性生产的木质素的顺序溶剂分级

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摘要

The purpose of this study was to investigate the impact of lignin structure, especially its average molecular weight (Mw) on the distribution of catalytically depolymerized products. Soda lignin (SL) was sequentially fractionated by organic solvents (ethyl acetate: F1, methanol: F2, acetone: F3, dioxane/water: F4, and insoluble fraction: F5). The Mw of SL, F1, F2, F3, and F4 were 2800, 1120, 2860, 5850, and 7200 Da, while that of F5 could not be determined due to its low solubility in GPC solvent. 2D-HSQC-NMR analysis revealed that the relative abundance of the beta-O-4 linkage increased upon increasing the Mw of the lignin fraction. Each fraction was efficiently depolymerized into lignin-oil under the combination of supercritical ethanol (350 degrees C) and Ru/C (5 wt%). The yield of lignin-oil, mixture of monoaromatic compounds, as well as high molecular phenolics, ranged from 62.5 to 81.4 wt%. The yield of total monoaromatic compounds in lignin-oil varied from ca. 3.4 to 10 wt% depending on the lignin fraction. The selectivity of monoaromatic compounds produced from the lignin depolymerization process was clearly affected by the Mw value of lignin. Specifically, F1 and F2 yielded higher amounts of non-alkylated phenols, methylated-, and ethylated phenols compared to the other lignin fractions.
机译：本研究的目的是研究木质素结构的影响，尤其是其平均分子量（MW）对催化解聚产物的分布。通过有机溶剂（乙酸乙酯：F1，甲醇：F2，丙酮：F3，二恶烷/水：F4和不溶性分数：F5）依次分离苏打木蛋白酶（SL）。 SL，F1，F2，F3和F4的MW为2800,1120,2860,5850和7200DA，而F5的溶解度由于其在GPC溶剂中的低溶解度而无法确定。 2D-HSQC-NMR分析显示，在增加木质素级分的MW时，β-O-4连杆的相对丰度增加。每个级分在超临界乙醇（350℃）和Ru / C（5wt％）的组合下将每个级分有效地解聚。木质素 - 油的产率，单芳族化合物的混合物以及高分子酚类的混合物，范围为62.5至81.4wt％。木质素油总体芳族化合物的产量不同于CA.根据木质素分数，3.4至10wt％。从木质素脱聚过程中产生的单芳族化合物的选择性受到木质素的MW值的影响。具体地，与其他木质素级分相比，F1和F2产生较高量的非烷基化酚，甲基化和乙基化酚。

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  • 来源
    《RSC Advances》 |2017年第84期|共9页
  • 作者

    Kim Jae-Young; Park Shin Young; Lee Jae Hoon; Choi In-Gyu; Choi Joon Weon;

  • 作者单位

    Seoul Natl Univ Res Inst Agr &

    Life Sci Dept Forest Sci 599 Gwanak Ro Seoul 151921 South Korea;

    Seoul Natl Univ Res Inst Agr &

    Life Sci Dept Forest Sci 599 Gwanak Ro Seoul 151921 South Korea;

    Seoul Natl Univ Res Inst Agr &

    Life Sci Dept Forest Sci 599 Gwanak Ro Seoul 151921 South Korea;

    Seoul Natl Univ Res Inst Agr &

    Life Sci Dept Forest Sci 599 Gwanak Ro Seoul 151921 South Korea;

    Seoul Natl Univ Inst Green Biosci &

    Technol Grad Sch Int Agr Technol Pyeongchang 232916 South Korea;

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