Abstract
Currently, microalgae have begun to be explored extensively as potential feedstock for renewable fuel production. To transform microalgae into liquid fuel, hydrothermal liquefaction (HTL) process is proposed. In this study, HTL process was conducted without catalyst in controlled high pressure batch reactor. The effect of reaction temperature (200 and 225 °C) and time (10-30 minutes with interval of 10 minutes) of HTL process on the products (bio-crude oil, biochar, water-phase liquid and gaseous) was investigated. Microalgae Tetraselmis chuii studied in this HTL process was characterized in low lipid condition. The bio-crude oil yield of 0.77% was the maximum value, reached at temperature of 225 °C and reaction time of 30 minutes. In this experimental condition, the lowest product was obtained for biochar and water-phase liquid. On the contrary, the increasing temperature and reaction time led process to produce more gaseous phase hydrocarbon.
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