Process optimization for microwave-assisted direct liquefaction of Sargassum polycystum C.Agardh using response surface methodology
2012
Guo, Jingxue | Zhuang, Yingbin | Chen, Limei | Liu, Junhai | Li, Demao | Ye, Naihao
Response surface methodology (RSM) was used to optimize the microwave-assisted direct liquefaction of Sargassum polycystum C.Agardh in ethylene glycol (EG) with H₂SO₄ as a catalyst. Based on the results of single factor experiments, EG-to-feedstock ratio, temperature and catalyst content were chosen as independent variables for a central composite rotatable design (CCRD). The optimal liquefaction conditions were estimated as: the EG-to-feedstock ratio of 18.50:1 (w/w), the temperature of 170°C, the reaction time of 15min, catalyst content of 9.6% (catalyst/EG, w/w%) and microwave power of 400W with the liquefaction yield of 87.70%. The bio-oils were mainly composed of fatty acid methyl ester and alkane with a long chain from C₁₇ to C₂₀.
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