Effects of Acidic Deep Eutectic Solvent Pretreatment on Sugarcane Bagasse for Efficient 5-Hydroxymethylfurfural Production,Energy Technology

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Effects of Acidic Deep Eutectic Solvent Pretreatment on Sugarcane Bagasse for Efficient 5-Hydroxymethylfurfural Production
Energy Technology ( IF 3.6 ) Pub Date : 2021-07-22 , DOI: 10.1002/ente.202100396
Qinghua Ji ₁ , Chin Ping Tan ₂ , Abu ElGasim A. Yagoub ₃ , Li Chen ₄ , Dong Yan ₁ , Cunshan Zhou _{1,

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Affiliation

Herein, a natural deep eutectic solvent (DES) is developed to deconstruct the recalcitrant structure of sugarcane bagasse (SCB) for further 5-hydroxymethylfurfural (5-HMF) production. The properties, structure of the DES, and the influence of pretreatment and reaction conditions on SCB are studied. The findings reveal that carboxylic acid DES pretreatment results in a substantial decrease of hemicelluloses and lignin. At the same time, carboxylic acid DES systems significantly improve the yield of 5-HMF at 110 °C. Under the optimum conditions (choline chloride (ChCl)–lactic acid (8.33 wt% H₂O), SCB/DES (1:10/wt:wt), temperature 110 °C, and time 4 h), the 5-HMF yield obtained from SCB is 56.68 mol% (1.62 mg mL⁻¹). This 5-HMF yield is significantly higher by 25.88, 16.43, and 9.87-folds compared to the 5-HMF yield from the SCB treated with ChCl–urea, ChCl–glycerin, and ChCl–ethylene glycol, respectively, under the same reaction conditions. In addition, component analysis and structural characteristics suggest that the content of lignin in the SCB decreases significantly, and the cellulose and hemicellulose are partially hydrolyzed after being treated with the DES composed of ChCl and carboxylic acids. Overall, this work shows that SCB pretreatment with a carboxylic acid DES is promising for low-cost biorefineries to achieve effective biomass fractionation and conversion.

中文翻译：

酸性深共熔溶剂预处理对甘蔗渣高效生产5-羟甲基糠醛的影响

在此，开发了一种天然的低共熔溶剂 (DES) 来解构甘蔗渣 (SCB) 的顽固结构，以进一步生产 5-羟甲基糠醛 (5-HMF)。研究了DES的性质、结构以及预处理和反应条件对SCB的影响。研究结果表明，羧酸 DES 预处理导致半纤维素和木质素的显着减少。同时，羧酸 DES 系统显着提高了 110 °C 下 5-HMF 的产率。在最佳条件（氯化胆碱 (ChCl)-乳酸 (8.33 wt% H ₂ O)、SCB/DES (1:10/wt:wt)、温度 110 °C 和时间 4 h）下，5-HMF从 SCB 获得的产率为 56.68 mol% (1.62 mg mL ^-1）。在相同的反应条件下，与分别用 ChCl–尿素、ChCl–甘油和 ChCl–乙二醇处理的 SCB 的 5-HMF 产量相比，这种 5-HMF 产量显着高出 25.88、16.43 和 9.87 倍. 此外，成分分析和结构特征表明，SCB中木质素的含量显着降低，纤维素和半纤维素在用由ChCl和羧酸组成的DES处理后部分水解。总体而言，这项工作表明，用羧酸 DES 预处理 SCB 有望使低成本生物精炼厂实现有效的生物质分馏和转化。

更新日期：2021-09-09

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