(721h) Influence of Solvents on Metal Contents in Biocrude Oil from Hydrothermal Liquefaction of Microalgae
In this study, we used two hydrothermal liquefaction conditions that gave high biocrude yields and lower iron contents . We selected eight organic solvents with different polarities and boiling points. For product recovery, we determined how preventing contact between the solvent and the aqueous-phase product influenced the metal contents in the biocrude , as this approach would probably be employed in a large-scale operation. We observed a large influence on bio-oil yields when using different solvents, and that the alkali metal contents are at least two orders of magnitude higher when the solvent and aqueous phase never came into contact. The choice of solvent can reduce iron content by half and can make a significant difference in other metals as well. The effect of solvent demetallation cannot be contributed to one single solvent property but multiple factors such as polarity, solubility, and dielectric constant need to be considered.
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 Jiang, J., and P. E. Savage. "Metals and Other Elements in Biocrude from Fast and Isothermal Hydrothermal Liquefaction of Microalgae." Energy & Fuels (2017). 10.1021/acs.energyfuels.7b03144
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