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. 2021 Apr 20;121(19):12016–12034. doi: 10.1021/acs.chemrev.0c01244

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© 2021 The Authors. Published byAmerican Chemical Society

Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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SFC column configurations for the elution of four fractions from light-oil samples.( A) Valve A operated in forward-flush mode, oxygenates fractions are retained on PVA column. (B) Valve A switched to negative position, PVA column operated in back-flush mode, while silica and silver column are in stop-flow mode (saturates). (C) Aromatics retained on silica column, valve A switched off, valve B switched on, to backflush the PVA and silver column for unsaturated fraction. (D) Both valves switched on for the forward-flush mode to elute aromatics. Reprinted with permission from ref (58). Copyright 2013 American Chemical Society.