Abstract The reaction pathway of nitrogen containing compounds under hydrothermal liquefaction (HTL) conditions was investigated by using amino acids as protein model compounds. The effect of organic acids and alkaline catalysts was also investigated by determining the structure and the partition of nitrogen containing species between the resulting solid, aqueous and bio-oil phases. Representative results showed that operating in a water-acetic acid (95/5% v/v) binary solvent system resulted in a dramatic improvement in carbon recovery in the oil phase due to the transformation of water soluble hydrophilic products into oil soluble derivatives by acylation of the amino moiety. The conclusions of this study provide a useful tool to improve the HTL process applied to nitrogen rich biomass, such as the organic fraction of urban waste, sewage sludge, and aquatic biomass (microalgae).

中文翻译：

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通过模型化合物的水热液化过程阐明含氮物种的反应途径

摘要 以氨基酸为蛋白质模型化合物，研究了含氮化合物在水热液化(HTL)条件下的反应途径。还通过确定结构和含氮物质在所得固体、水相和生物油相之间的分配来研究有机酸和碱性催化剂的影响。代表性结果表明，由于水溶性亲水性产物通过酰化作用转化为油溶性衍生物，在水-乙酸 (95/5% v/v) 二元溶剂体系中操作导致油相中碳回收率的显着提高氨基部分。本研究的结论为改进应用于富氮生物质的 HTL 工艺提供了有用的工具，例如城市垃圾的有机部分、污水污泥、