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Supercritical carbon dioxide (sCO2) extraction was applied on a raw biocrude, obtained by hydrothermal liquefaction of pinewood. The extractions were carried out in a semicontinuous mode, in the ranges of 80 to 150 °C and 330 to 450 bar. Extraction yields from 44 to 53 wt % were achieved. The extracts were richer in lower-molecular-weight (MW) compounds, with fatty acids and aromatic hydrocarbons concentrated up to 14 and 24 wt %, respectively. For comparable MWs, lower-polarity compounds concentrated in the extracts. Compared to the feed, the extracts exhibited a lower density (from 1030 kg/m3 down to 914 kg/m3), lower water content (from 5.7 wt % down to 1.3 wt %), and lower oxygen content (from 10.0 wt % down to 5.0 wt %). In addition, the metal content was drastically reduced (from 8500 mg/kg down to 170 mg/kg on average). In the context of biofuel production, the sCO2 extracts are a better feed for catalytic hydrotreating.
Montesantos, N., 2020, Aalborg Universitetsforlag. 103 s. (Ph.d.-serien for Det Ingeniør- og Naturvidenskabelige Fakultet, Aalborg Universitet).
Publikation: Bog/antologi/afhandling/rapport › Ph.d.-afhandlingÅben adgangFil