在 CO 气氛中停留时间对两步法液化水稻秸秆的影响：亚临界水与超临界乙醇的差异。
Effect of residence time on two-step liquefaction of rice straw in a CO atmosphere: Differences between subcritical water and supercritical ethanol.
机构信息
Key Laboratory of Clean Energy of Liaoning, College of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, PR China.
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, PR China.
出版信息
Bioresour Technol. 2017 Apr;229:143-151. doi: 10.1016/j.biortech.2016.12.110. Epub 2017 Jan 3.
This study investigated the influence of temperature and residence time on liquefaction of rice straw in subcritical CO-subcritical water (subCO-subHO) and in subcritical CO-supercritical ethanol (subCO-scEtOH), considering the final reaction temperatures (270-345°C) and residence times (15 and 30min). Residence time was identified as a crucial parameter in the subCO-subHO liquefaction, whereas residence time had a marginal influence on subCO-scEtOH liquefaction. When reaction conditions were 320°C and 15min, solvents have weak impact on the quality of bio-oil, HHV 28.57MJ/kg and 28.62MJ/kg, respectively. There was an obvious difference between the subCO-subHO and subCO-scEtOH liquefaction mechanisms. In subCO-subHO, CO promoted the carbonyl reaction. In subCO-scEtOH, supercritical ethanol have the function of donating hydrogen and promoting the reaction of hydroxyl-alkylation.
本研究考察了温度和停留时间对水稻秸秆在亚临界 CO-亚临界水（subCO-subHO）和亚临界 CO-超临界乙醇（subCO-scEtOH）中液化的影响，考虑了最终反应温度（270-345°C）和停留时间（15 和 30min）。停留时间被确定为 subCO-subHO 液化中的关键参数，而停留时间对 subCO-scEtOH 液化的影响较小。当反应条件为 320°C 和 15min 时，溶剂对生物油的质量影响不大，HHV 分别为 28.57MJ/kg 和 28.62MJ/kg。subCO-subHO 和 subCO-scEtOH 液化机制有明显的不同。在 subCO-subHO 中，CO 促进了羰基反应。在 subCO-scEtOH 中，超临界乙醇具有供氢作用，并促进了羟基-烷基化反应。
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