Thermochemical liquefaction characteristics of microalgae in sub- and supercritical ethanol

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• 作者：Huajun Huang ; Xingzhong Yuan ; Guangming Zeng ; Jingyu Wang ; Hui Li ; Chunfei Zhou ; Xiaokai Pei ; Qiao You ; Liang Chen
• 关键词：Microalgae ; Thermochemical liquefaction ; Sub- and supercritical ethanol ; Bio-oil
• 刊名：Fuel Processing Technology
• 出版年：2011
• 出版时间：January 2011
• 年：2011
• 卷：92
• 期：1
• 页码：147-153
• 全文大小：451 K

文摘

Thermochemical liquefaction characteristics of Spirulina, a kind of high-protein microalgae, were investigated with the sub- and supercritical ethanol as solvent in a 1000 mL autoclave. The influences of various liquefaction parameters on the yields of products (bio-oil and residue) from the liquefaction of Spirulina were studied, such as the reaction temperature (T), the S/L ratio (R₁, solid: Spirulina, liquid: ethanol), the solvent filling ratio (R₂) and the type and dosage of catalyst. Without catalyst, the bio-oil yields were in the range of 35.4 wt. % and 45.3 wt. % depending on the changes of T, R₁ and R₂. And the bio-oil yields increased generally with increasing T and R₂, while the bio-oil yields reduced with increasing R₁. The FeS catalyst was certified to be an ideal catalyst for the liquefaction of Spirulina microalgae for its advantages on promoting bio-oil production and suppressing the formation of residue. The optimal dosage of catalyst (FeS) was ranging from 5–7 wt. % . The elemental analyses and FT-IR and GC–MS measurements for the bio-oils revealed that the liquid products have much higher heating values than the crude Spirulina sample and fatty acid ethyl ester compounds were dominant in the bio-oils, irrespective of whether catalyst was used.