Currently, the conversion of lignocellulosic biomass into furfural using deep eutectic solvents (DES) as the solvent and catalyst has many shortcomings including low furfural yields and inefficient resource utilization. To address these issues, a novel effective DES-methyl isobutyl ketone (DES-MIBK) reaction system was designed and used to catalyze the transformation of wheat straw to furfural and separate/recover cellulose and lignin in this work. The results showed that the DES-MIBK system could significantly improve furfural yield of up to 76.2 % at a mild condition (at 100 °C for 60 min). Furthermore, cellulose and lignin were fractionated and recovered from the reaction residues and the lignin yield reached 68.7 %. Moreover, the recovered cellulose exhibits high crystallinity (CrI=67.7 %). and the obtained lignin also has good uniformity with a small polydispersity index (PDI=2.36), and the results of FT-IR and D NMR indicated that the obtained lignin retains its fundamental structure. This research highlights that the innovative DES-MIBK system has a high-efficient in the production of furfural and the recovery of lignin and cellulose, which could provide a novel strategy for the high-value and sustainable application of lignocellulose biomass.

中文翻译：

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一种新型低共熔溶剂-甲基异丁基酮双相体系，用于麦秆催化转化为糠醛并回收纤维素和木质素


目前，以低共熔溶剂（DES）为溶剂和催化剂将木质纤维素生物质转化为糠醛存在糠醛收率低、资源利用效率低等诸多缺点。为了解决这些问题，本工作设计了一种新型有效的DES-甲基异丁基酮（DES-MIBK）反应体系，并用于催化麦秆转化为糠醛并分离/回收纤维素和木质素。结果表明，DES-MIBK系统在温和条件下（100℃，60分钟）可显着提高糠醛收率，最高可达76.2%。此外，从反应残渣中分馏回收纤维素和木质素，木质素收率达到68.7%。此外，回收的纤维素表现出高结晶度(CrI＝67.7％)。所得木质素均匀性好，多分散指数小(PDI=2.36)，FT-IR和D NMR结果表明所得木质素保留了其基本结构。该研究表明，创新的DES-MIBK系统在糠醛生产以及木质素和纤维素回收方面具有高效性，可为木质纤维素生物质的高价值和可持续应用提供新的策略。