Department of Petrochemical and Polymer Science, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Bangkok 10330, Thailand.
Faculty of Engineering and Architecture, Rajamangala University of Technology Tawan-ok, Uthenthawai Campus, 225 Phayathai Road, Bangkok 10330, Thailand.
Bioresour Technol. 2015 Sep;191:426-32. doi: 10.1016/j.biortech.2015.04.027. Epub 2015 Apr 18.
This work investigated an influence of operating conditions on the biocrude yield and properties obtained from hydrothermal liquefaction (HTL) of Coelastrum sp. microalgae in a two-step sequential HTL (THTL) and a single-step HTL (SHTL) using a semi-continuous system. A higher biocrude yield with a lower nitrogen content was obtained with the THTL process than the SHTL one. The operating temperature, pressure and water flow rate were sequentially varied in a univariate analysis for a 2 h reaction time to optimize the obtained biocrude yield. Increasing the temperature improved the biocrude yield, but the second step temperature should not be higher than 320 °C to prevent the thermal cracking to gaseous compounds. The optimal conditions of THTL were preliminarily temperature of 200 and 320 °C and pressure of 7 and 20 MPa for the first and second step, respectively, both with a water flow rate of 0.50 mL/min.
本工作研究了操作条件对两步序贯水热液化（THTL）和一步序贯水热液化（SHTL）中海拉斯特小球藻的水热液化（HTL）中生物粗油产率和性质的影响，使用半连续系统。与 SHTL 工艺相比，THTL 工艺获得的生物粗油产率更高，氮含量更低。在 2 小时反应时间的单变量分析中，依次改变操作温度、压力和水流量以优化获得的生物粗油产率。提高温度可以提高生物粗油的产率，但第二步的温度不应高于 320°C，以防止热裂解析出气态化合物。THTL 的最佳条件初步为第一和第二阶段的温度分别为 200 和 320°C，压力分别为 7 和 20 MPa，水流量均为 0.50 mL/min。
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