Liu Chunze, Wufuer Anaerguli, Kong Liping, Wang Yuanyuan, Dai Liyi
College of Chemistry and Molecular Engineering, East China Normal University 500 Dongchuan Road Shanghai 200241 China
RSC Adv. 2018 Sep 12;8(55):31717-31724. doi: 10.1039/c8ra04668a. eCollection 2018 Sep 5.
In this paper, we report our investigation into a two-step method of transformation of algae to bio-oil. Elemental analysis, gas chromatography-mass spectrometry and Fourier transform infrared spectroscopy were used to analyze bio-oil. First, organic solvent Soxhlet extraction and reflux extraction were used in the algal extraction step. Ethanol was proven to be the best solvent, and the addition of MgSO could transform acids to esters. In MgSO extraction oil, the yield of hexadecanoic acid ethyl ester was as high as 48.40%. Then, the residual algae powders through the catalytic hydrothermal liquefaction process were converted to bio-oil. Commercialized noble metal catalysts Pd/C, Pt/C, Ru/C and Rh/C combined with Pd/HZSM-5 were used in the second step. Rh/C performed the best in the catalytic hydrothermal liquefaction process, and the highest bio-oil yield of 50.98% and HHV of 30.67 MJ kg were achieved. The oil yield through two steps was higher than that by a direct decomposition step. Also, the two-step method could achieve a higher energy conversion ratio of 85.61% and total energy of 81.09 kJ.
在本文中，我们报告了对藻类转化为生物油的两步法的研究。采用元素分析、气相色谱 - 质谱联用和傅里叶变换红外光谱对生物油进行分析。首先，在藻类提取步骤中使用了有机溶剂索氏提取和回流提取。乙醇被证明是最佳溶剂，添加硫酸镁可将酸转化为酯。在硫酸镁提取油中，十六烷酸乙酯的产率高达48.40%。然后，通过催化水热液化过程将残留的藻类粉末转化为生物油。第二步使用了商业化的贵金属催化剂Pd/C、Pt/C、Ru/C和Rh/C与Pd/HZSM - 5组合。Rh/C在催化水热液化过程中表现最佳，生物油产率最高达到50.98%，高位发热量为30.67 MJ/kg。两步法的产油率高于直接分解步骤。此外，两步法可实现更高的能量转化率85.61%和总能量81.09 kJ。
