Imperial College London, Department of Chemical Engineering, Exhibition Road, South Kensington, London SW7 2AZ, UK.
Imperial College London, Department of Chemical Engineering, Exhibition Road, South Kensington, London SW7 2AZ, UK.
Bioresour Technol. 2015 Sep;191:460-8. doi: 10.1016/j.biortech.2015.04.012. Epub 2015 Apr 9.
This investigation demonstrates the utility of a novel laboratory scale continuous plug flow reactor for fast Hydrothermal Liquefaction (HTL) of microalgae in a quartz lined chamber. Reactions were carried out between 300 and 380 °C and residence times of 0.5-4 min. Cyclohexane was used as a co-solvent to enhance extraction and prevent char formation. Highest biocrude yield of 38 wt.% was achieved at 380 °C and 30 s as well as Water Soluble Fraction containing up to 60 wt.% matter recovered. Analysis of the biocrude showed that the extent of deoxygenation and denitrogenation after HTL varied and is dependent on the reaction conditions, Fourier Transform Infrared Spectroscopy analysis showed that biocrude contains similar functional moieties with only a small difference observed at different reaction conditions. Conversely, the Simulated Distillation and Size Exclusion Chromatography data showed that harsher conditions produced marginally better biocrude with improved boiling point profile and lower molecular weight compounds, respectively which was confirmed using Gas Chromatography-Mass Spectrometry.
本研究展示了一种新型实验室规模连续活塞流反应器在石英衬里室内快速水热液化（HTL）微藻的实用性。反应在 300 至 380°C 之间进行，停留时间为 0.5-4 分钟。环己烷用作共溶剂以增强提取并防止炭形成。在 380°C 和 30 秒时，最高生物油得率达到 38wt%，并且可回收高达 60wt%的水溶性馏分。生物油的分析表明，HTL 后的脱氧和脱氮程度不同，取决于反应条件，傅里叶变换红外光谱分析表明，生物油含有相似的官能团，只是在不同的反应条件下观察到微小差异。相反，模拟蒸馏和尺寸排阻色谱数据表明，更苛刻的条件分别产生了稍好的生物油，具有改进的沸点分布和更低分子量的化合物，这分别使用气相色谱-质谱法得到了证实。
