| 초록 |
Hydrothermal liquefaction of algal biomass is the most common thermal treatment to convert solid algal feedstock to liquid products. However, lower bio-oil yield, because of partitioning of aqueous and organic phases during separation of water from bio-oil, is a primary concern of this liquefaction route. In this study we applied supercritical alcohol (methanol and ethanol) to liquefy macroalgae (Saccharina japonica) biomass. Contrary to previous researches, methanol performs better to maximize conversion of the solid biomass as well as to increase the bio-oil yield. At 300 °C, ethanol resulted a maximum conversion of 84% and a bio-oil yield of 58 wt% whereas almost complete conversion and bio-oil yield of 65 wt% was obtained when ethanol was replaced with methanol as a solvent. Not only the bio-oil yield was higher for supercritical methanol but also higher heating value of bio-oil was also quite comparable to that of ethanol case (ca. 34 MJ kg-1). Bio-oil compositional analysis using GC-TOF/MS, boiling point distribution analysis using TGA and solvent consumption during the reaction using GC-FID were also performed in this study. |
