A supercritical fluid rectification method (SFR) is described for selective extraction of single ring phenolic components from lignin microwave-pyrolysis oil. Supercritical CO2 at 35 °C and 8 MPa was used to extract phenols from the oil, after which the CO2 solution was passed up a column with a temperature gradient of 55–95 °C. SFR yielded up to 73% single ring phenolic components.
B. P. Mudraboyina, D. Fu and P. G. Jessop, Green Chem., 2015, 17, 169 DOI: 10.1039/C4GC01433B
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