Abstract The upgrading of bio-oil with the existing distillation technologies is mainly hindered by polymerisation due to the reactive nature of bio-oil when it is heated up during distillation. We propose that the distillation of bio-oil at high pressure can significantly reduce the extent of polymerisation. This study aims to investigate the roles of process parameters, especially pressure, in the high-pressure reactive distillation of bio-oil produced from the pyrolysis of mallee woody biomass. The bio-oil distillation fraction yields and properties were evaluated to demonstrate the advantages of the distillation at elevated pressures over distillation at atmospheric pressure. Our results indicate that high-pressure distillation can achieve high distillate yields with reduced polymerisation because high pressure can retain water and other light components in the liquid phase to reduce the extent of polymerisation. Besides reducing the polymerisation, high pressure could also intensify the separation during the flash separation step. The distillate yield was around 90% when the distillation was carried out at 200 °C at a pressure higher than 20 barg.

中文翻译：

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生物油的高压反应蒸馏以减少聚合反应

摘要 由于生物油在蒸馏过程中加热时具有反应性，因此现有蒸馏技术对生物油的升级主要受到聚合反应的阻碍。我们建议在高压下蒸馏生物油可以显着降低聚合程度。本研究旨在研究工艺参数，尤其是压力，在高压反应蒸馏中对由木本木质生物质热解生产的生物油的作用。评估了生物油蒸馏馏分的产量和性质，以证明高压蒸馏优于大气压蒸馏的优点。我们的结果表明，高压蒸馏可以在减少聚合的情况下实现高馏出物收率，因为高压可以将水和其他轻组分保留在液相中以降低聚合程度。除了减少聚合之外，高压还可以加强闪蒸分离步骤中的分离。当蒸馏在 200 °C 和高于 20 barg 的压力下进行时，馏出物产率约为 90%。