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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：木质素的顺序溶剂分级分离，以通过Ru催化乙醇分解法选择性生产单芳烃

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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 β-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 °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：这项研究的目的是研究木质素结构，特别是其平均分子量（ M w ）对催化解聚反应分布的影响。产品。依次用有机溶剂（乙酸乙酯：F1，甲醇：F2，丙酮：F3，二恶烷/水：F4和不溶级分：F5）分离苏打木质素（SL）。 SL，F1，F2，F3和F4的 M w 为2800、1120、2860、5850和7200 Da，而F5在GPC溶剂中的溶解度低，因此无法确定。 2D-HSQC-NMR分析表明，随着木质素部分的 M w 的增加，β-O-4键的相对丰度增加。 。在超临界乙醇（350°C）和Ru / C（5 wt％）的组合下，将每个馏分有效地解聚为木质素油。木质素油，单芳族化合物的混合物以及高分子酚类的产率为62.5至81.4 wt％。木质素油中总单芳族化合物的产率在 ca。范围内，变化范围为3.4至10 wt％，具体取决于木质素含量。木质素解聚过程产生的单芳族化合物的选择性明显受木质素的 M w 值影响。具体而言，与其他木质素馏分相比，F1和F2产生的非烷基化酚，甲基化和乙基化酚含量更高。

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