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Huang H.,Hunan University | Huang H.,Key Laboratory of Environment Biology and Pollution Control | Yuan X.,Hunan University | Yuan X.,Key Laboratory of Environment Biology and Pollution Control | And 14 more authors.
Fuel Processing Technology | Year: 2011

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. © 2010 Elsevier B.V. All rights reserved. Source

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