This work aimed at investigating the synthesis of 5-HMF from the ultrasound-ionic liquid pretreated sugarcane bagasse in a microwave-solid acid-ionic liquid system. The XRD analysis indicated that the macrostructure of cellulose remained intact after the ultrasound-ionic pretreatment, [Bmim]OAc showed better performance than [Bmim]Cl. The best conditions for the untreated bagasse conversion to 5-HMF were [Bmim]OAc, ion-exchange resin catalyst, D001-cc, 140 ℃ and 25 min. The ultrasound-ionic liquid pretreatment at different frequencies (20–50 kHz) increased the 5-HMF yield by 39.73–165.43 % compared with that of the untreated bagasse, indicating the role of the acoustic cavitation in enhancing the transformation of bagasse into 5-HMF. The bagasse pretreated with [Bmim]OAc/ultrasound at 40 kHz/30 min showed the highest yield of 5-HMF (65.72 %). The synthesis of 5-HMF from the pretreated sugarcane bagasse in the microwave-solid acid/ionic liquid system could be a promising channel for production of biofuels and related chemicals.

这项工作旨在研究在微波-固体酸-离子液体系统中，超声-离子液体预处理的甘蔗渣中5-HMF的合成。XRD分析表明，超声预处理后纤维素的宏观结构保持完整，[Bmim] OAc的性能优于[Bmim] Cl。未经处理的蔗渣转化为5-HMF的最佳条件是[Bmim] OAc，离子交换树脂催化剂，D001-cc，140℃和25分钟。与未处理的甘蔗渣相比，在不同频率（20–50 kHz）上进行的超声波液体预处理可使5-HMF产量增加39.73–165.43％，这表明声空化在增强甘蔗渣向5-蔗糖转化的作用中HMF。以[Bmim] OAc /超声波在40 kHz / 30 min预处理的蔗渣显示出5-HMF的最高收率（65.72％）。