This work addresses an unprecedented combination of solvents (choline chloride and oxalic acid deep eutectic solvent, carbon dioxide, and ethanol) that were used to fractionate sugarcane bagasse into three main fractions: 1) glucan rich fibers, 2) dissolved hemicellulose sugars and co-products, and 3) precipitated lignin. To maximize the lignin removal, a two-level three-variable design of experiments assessed the effects of solids loading, DES to biomass mass ratio, and the amount of CO₂. Following, kinetic were carried out in temperatures varying from 130 to 190 °C, using anhydrous and hydrated ethanol to improve hemicellulose hydrolysis and delignification. At the best condition, delignification extent as high as 90% were obtained after reaction times of 30 min. These results were accompanied by glucan contents of approximately 85 wt% and by over 80% of fibers' glucan maintenance. Also, over 60% of the hemicellulose sugars were dissolved in a liquid fraction. Finally, the third fraction was composed of the precipitated lignin with negligible carbohydrate contents. Lignin samples presented low apparent average molecular masses, and FT-IR spectra demonstrated the presence of bands typical of lignin samples from herbaceous crops. In general, this work attested to the technical feasibility of using green solvents for the efficient fractionation of sugarcane bagasse into streams that could be exploited to produce fuels, chemicals, and biomaterials.

这项工作解决了一种前所未有的溶剂组合（氯化胆碱和草酸低共熔溶剂、二氧化碳和乙醇），这些溶剂用于将甘蔗渣分成三个主要部分：1）富含葡聚糖的纤维，2）溶解的半纤维素糖和共产物，和 3) 沉淀的木质素。为了最大限度地去除木质素，两级三变量实验设计评估了固体负载、DES 与生物质质量比和 CO _{2量的影响}. 随后，在 130 至 190 °C 的温度范围内进行动力学研究，使用无水和水合乙醇来改善半纤维素水解和脱木质素。在最佳条件下，反应时间为 30 分钟后，脱木素程度高达 90%。这些结果伴随着大约 85 wt% 的葡聚糖含量和超过 80% 的纤维葡聚糖维持率。此外，超过 60% 的半纤维素糖溶解在液体级分中。最后，第三部分由沉淀的木质素组成，碳水化合物含量可忽略不计。木质素样品的表观平均分子量较低，FT-IR 光谱表明存在来自草本作物的木质素样品的典型条带。一般来说，