The development of non-waste biorefinery technology is conducive to the efficient utilization of waste biomass resources. In this study, the microwave-assisted deep eutectic solvent (DES) was used to pretreat sugarcane bagasse for efficient separation of chemical components and upgrading each component into industrial products, including paper, lignin microspheres (LMS) and furfural. After rapid and mild DES pretreatment at 135 °C for 20 min, the retention rate of cellulose in the solid residue was 95.2 %, while the removal rates of hemicellulose and lignin were 84.1 % and 88.3 %, respectively. The whiteness of handmade paper derived from solid residue could reach 63.8 %ISO. During DES fractionation, the gradual increase of water reduced the collision probability of lignin fragments, inhibited condensation reactions, and achieved graded precipitation of lignin. Then, the self-assembly method enabled the fabrication of both small solid LMS and large hollow LMS. Furthermore, AlCl was added to the diluted DES to convert the separation system into a catalytic system. Under the synergistic catalysis of lactic acid, AlCl, and choline chloride, biomass sugars were efficiently converted into furfural with a yield of 68.81 %. In a word, the high-value utilization of all components of sugarcane bagasse was achieved through a sustainable biorefining process, resulting in an impressive comprehensive utilization rate of 70.6 %.

中文翻译：

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微波辅助氯化胆碱/乳酸预处理甘蔗渣成分高效分离及增值利用


发展无废生物炼制技术有利于废弃生物质资源的高效利用。在这项研究中，采用微波辅助低共熔溶剂（DES）对甘蔗渣进行预处理，以有效分离化学成分，并将每种成分升级为工业产品，包括纸张、木质素微球（LMS）和糠醛。经过 135 ℃ 快速温和 DES 预处理 20 min 后，固体残渣中纤维素的保留率为 95.2%，半纤维素和木质素的去除率分别为 84.1% 和 88.3%。固体残渣手工纸白度可达63.8%ISO。 DES分馏过程中，水的逐渐增加，降低了木质素碎片的碰撞概率，抑制了缩合反应，实现了木质素的分级沉淀。然后，自组装方法使得能够制造小型实心LMS和大型空心LMS。此外，将AlCl添加到稀释的DES中，将分离系统转化为催化系统。在乳酸、AlCl3和氯化胆碱的协同催化下，生物质糖有效转化为糠醛，收率达到68.81%。总之，通过可持续的生物精炼工艺，实现了甘蔗渣各成分的高值化利用，综合利用率高达70.6%。