Answers are grounded in this paper and cite their sources.
Various organics with quite different oxygen-containing functional groups mixing together in bio-oil lead to the high instability of bio-oils. A liquid–liquid extraction method was developed to separate the bio-oil into different chemical groups by their polarities to stabilize bio-oils and improve the quality. The separated bio-oil had similar oxygen-containing functional groups in different phases. Biomass pyrolysis using Douglas fir pellet and characterization of the bio-oil chemical compounds were conducted, followed by bio-oil liquid–liquid extractions with several solvents (e.g., hexane, petroleum ether, and chloroform). In comparison to the raw bio-oil, the solvent phase had high concentrations (85%) of phenols and guaiacols, while no sugar and very low acid and alcohol contents were detected, which were left in the water phases.
No takes yet. Share an insight, caveat, or question.
Wei et al. (2014) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: