Efficient synthesis of furfural from xylose over the HCl catalyst in a water-methyl isobutyl ketone biphasic system was achieved in slug flow microreactors, using NaCl as a promotor which facilitates xylose dehydration and suppresses xylose condensation. An optimized furfural yield of 93% was obtained from 1 M xylose over 0.2 M HCl with 10 wt% NaCl at 180°C within 4 min. A comprehensive kinetic model was developed from monophasic experiments in water in microreactors, by incorporating the acidity in water and kinetic constants as a function of the chloride ion concentration. The coupling of kinetic model with furfural extraction, with consideration of phase volume change as a function of temperature and partial phase miscibility, enables to predict the results of biphasic experiments in microreactors where mass-transfer limitation was eliminated. The aqueous phase containing HCl and NaCl could be readily recycled and reused multiple times without noticeable performance loss.

中文翻译：

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添加 NaCl 促进段塞流微反应器中木糖在 HCl 催化剂上高效合成糠醛

使用 NaCl 作为促进木糖脱水和抑制木糖缩合的促进剂，在段塞流微反应器中实现了在水-甲基异丁基酮双相系统中在 HCl 催化剂上从木糖高效合成糠醛。在 180°C 下 4 分钟内从 1 M 木糖与 0.2 M HCl 和 10 wt% NaCl 获得优化的 93% 糠醛产率。通过将水中的酸度和动力学常数结合为氯离子浓度的函数，从微反应器中水中的单相实验开发了一个综合动力学模型。动力学模型与糠醛萃取的耦合，考虑到作为温度和部分相混溶性函数的相体积变化，能够预测消除传质限制的微反应器中双相实验的结果。