Solvolysis of industrial corn stover lignin was carried out in methanol and ethanol to deconstruct lignin into monomers and small oligomers using various reactor configurations. We demonstrate that it is possible to overcome the limitations inherent to batch reactors by carrying out the solvolytic deconstruction in flow-through reactor systems as they allow for the continuous removal and rapid cooling of the products. Monomers and solvent-soluble product yields achieved in flow-through reactors were higher under all tested reaction conditions. We also investigated the effects of various reaction parameters and phase of solvent (sub- and supercritical) on the distribution and yield of lignin-derived products using complementary characterization techniques. p-Coumaric acid and ferulic acid were obtained as primary monomers with very high selectivity and a maximum monomer yield of 14.45 wt% was achieved at 250 °C and 85 bar in ethanol. Subsequent upgrading of the deconstructed fractions through fast pyrolysis was also studied. In addition to the increased yield of phenolic monomers (23.86 wt% vs. 10.29 wt%), char formation during pyrolysis was substantially decreased (26.36 wt% vs. 40.95 wt%) under optimized conditions. The beneficial impact of the solvolytic pretreatment was also reflected in an enhanced aromatic hydrocarbon yield during catalytic fast pyrolysis.

中文翻译：

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间歇式和流通式反应器中玉米秸秆木质素的溶剂分解比较研究

工业玉米秸秆木质素在甲醇和乙醇中进行溶剂分解，使用各种反应器配置将木质素解构为单体和小寡聚物。我们证明，通过在流通式反应器系统中进行溶剂分解，可以克服间歇式反应器固有的局限性，因为它们允许产品的连续去除和快速冷却。在所有测试的反应条件下，在流通式反应器中获得的单体和溶剂可溶产物产率更高。我们还使用互补表征技术研究了各种反应参数和溶剂相（亚临界和超临界）对木质素衍生产物的分布和产率的影响。磷- 香豆酸和阿魏酸作为主要单体以非常高的选择性获得，在 250 °C 和 85 bar 的乙醇中获得了 14.45 wt% 的最大单体产率。还研究了通过快速热解对解构馏分进行的后续升级。除了酚类单体的产量增加（23.86 wt%对10.29 wt%）外，在优化条件下，热解过程中的焦炭形成也显着减少（26.36 wt%对40.95 wt%）。溶剂分解预处理的有益影响也反映在催化快速热解过程中芳烃产率的提高。