The use of lignocellulosic biomass to obtain biofuels and chemicals produces a large amount of lignin as a byproduct. Lignin valorization into chemicals needs efficient conversion processes to be developed. In this work, hydrocracking of organosolv lignin was performed by using nickel Raney catalyst. Organosolv lignin was obtained from the pretreatment of eucalyptus wood at 170 °C for 1 h by using 1/100/100 (w/v/v) ratio of biomass/oxalic acid solution (0.4% w/w)/1-butanol. The resulting organic phase of lignin in 1-butanol was used in hydrogenation tests. The conversion of lignin was carried out with a batch reactor equipped with a 0.3 L vessel with adjustable internal stirrer and heat control. The reactor was pressurized at 5 bar with hydrogen at room temperature, and then the temperature was raised to 250 °C and kept for 30 min. Operative conditions were optimized to achieve high conversion in monomers and to minimize the loss of solvent. At the best performance conditions, about 10 wt % of the lignin was solubilized into monomeric phenols. The need to find a trade-off between lignin conversion and solvent side reaction was highlighted.

中文翻译：

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雷尼镍催化剂解聚加氢有机溶剂桉木木质素

使用木质纤维素生物质获得生物燃料和化学品会产生大量木质素作为副产品。木质素转化为化学品需要开发有效的转化工艺。在这项工作中，有机溶剂木质素的加氢裂化是通过使用镍 Raney 催化剂进行的。有机溶剂木质素是通过使用 1/100/100 ( w / v / v ) 比例的生物质/草酸溶液 (0.4% w / w )在 170 °C 下预处理桉木 1 小时获得的)/1-丁醇。所得木质素在 1-丁醇中的有机相用于氢化试验。木质素的转化使用配备有可调节内部搅拌器和热控制的 0.3 L 容器的间歇式反应器进行。在室温下用氢气将反应器加压至 5 bar，然后将温度升至 250 °C 并保持 30 分钟。优化操作条件以实现单体的高转化率并使溶剂损失最小化。在最佳性能条件下，约 10 wt% 的木质素溶解在单体酚中。强调需要在木质素转化和溶剂副反应之间找到平衡点。