| 초록 |
Hydrothermal liquefaction (HTL) was applied to convert N. oceanica and Golenkinia sp. into biocrude. High HTL temperature significantly increased biocrude yield, and the effect was more pronounced in Golenkinia sp., which has low lipid content. We measured elemental composition and maltene (hexane-solubles) concentration of the biocrude for quality assessment. In biocrude refining process, heteroatom (O, N, and S) is the main cause of catalyst poisoning, and asphaltene (hexane-insolubles) physically deactivates catalysts by coking. Although temperature dependent behavior of heteroatom levels was similar in both microalgae, effective hydrogen-carbon ratio (H/Ceff) was governed by the maltene concentration, which was greatly affected by the lipid content of microalgae and HTL temperature. Our findings showed that low temperature is optimal for high-lipid strains, and high temperature is optimal for low-lipid strains in the view point of energy-efficient production of biofuel. |
