In this article, the influence of combined pretreatment such as ultrasonic or torrefaction assisted deep eutectic solvents (DESs) on upgrading the bio-oil from corn stalk was evaluated. Moreover, the influence of combined pretreatment on the composition and pyrolysis performance of corn stalk also was investigated. The results indicated that DES pretreatment mainly destroyed the structure of lignin and caused the exposure of more cellulose. Ultrasonic assisted DES pretreatment promoted the further dissolution of lignin due to the mechanical effect. The combined pretreatment of torrefaction and DES was beneficial for the degradation of cellulose and hemicellulose. Moreover, DES pretreatment improved the yield of phenols (162.97 mg/g) and ketones (137.69 mg/g). The bio-oil yield decreased, but the phenols (the relative content reached 76.84%) were enriched via torrefaction+DES pretreatment. This research supplies an effective method for obtaining high value bio-oil with enrichment of different green chemicals from corn stalk.

中文翻译：

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超声/折射增强辅助低共晶溶剂对玉米秸秆生物油降解的影响

在本文中，评估了联合预处理（如超声或焙干辅助的深共熔溶剂（DES））对玉米秸秆生物油提质的影响。此外，还研究了联合预处理对玉米秸秆组成和热解性能的影响。结果表明，DES预处理主要破坏木质素的结构，并导致更多的纤维素暴露。由于机械作用，超声辅助DES预处理促进了木质素的进一步溶解。烘焙和DES的联合预处理有利于纤维素和半纤维素的降解。此外，DES预处理提高了苯酚（162.97 mg / g）和酮（137.69 mg / g）的产率。生物油产量下降，但酚类（相对含量达到76。通过焙干+ DES预处理富集了84％）。这项研究为从玉米秸秆中富集不同绿色化学物质提供了获得高价值生物油的有效方法。