High yields of furfural (>90 %) were achieved from xylose dehydration in a sustainable solvent system composed of γ‐valerolactone (GVL), a biomass derived solvent, and water. It is identified that high reaction temperatures (e.g., 498 K) are required to achieve high furfural yield. Additionally, it is shown that the furfural yield at these temperatures is independent of the initial xylose concentration, and high furfural yield is obtained for industrially relevant xylose concentrations (10 wt %). A reaction kinetics model is developed to describe the experimental data obtained with solvent system composed of 80 wt % GVL and 20 wt % water across the range of reaction conditions studied (473–523 K, 1–10 mm acid catalyst, 66–660 mm xylose concentration). The kinetic model demonstrates that furfural loss owing to bimolecular condensation of xylose and furfural is minimized at elevated temperature, whereas carbon loss owing to xylose degradation increases with increasing temperature. Accordingly, the optimal temperature range for xylose dehydration to furfural in the GVL/H₂O solvent system is identified to be from 480 to 500 K. Under these reaction conditions, furfural yield of 93 % is achieved at 97 % xylan conversion from lignocellulosic biomass (maple wood).

中文翻译：

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高温下γ-戊内酯/水体系中木糖脱水可提高糠醛收率

在由γ-戊内酯（GVL），生物质衍生的溶剂和水组成的可持续溶剂系统中，木糖脱水可实现高糠醛收率（> 90％）。已经确定需要高反应温度（例如498K）以实现高糠醛收率。另外，显示出在这些温度下的糠醛产率与初始木糖浓度无关，并且对于工业上相关的木糖浓度（10重量％）获得了高糠醛产率。建立了反应动力学模型，以描述由溶剂体系（由80 wt％的GVL和20 wt％的水组成）在所研究的反应条件范围内获得的实验数据（473–523 K，1–10 m m酸催化剂，66–660米米木糖浓度）。动力学模型表明，由于木糖和糠醛的双分子缩合引起的糠醛损失在升高的温度下最小，而由于木糖降解引起的碳损失随温度升高而增加。因此，在GVL / H ₂ O溶剂系统中木糖脱水成糠醛的最佳温度范围被确定为480至500K。在这些反应条件下，木素纤维素生物质的木聚糖转化率为97％时，糠醛收率为93％。 （枫木）。