Zhundong subbituminous coal (ZSBC) was exhaustively extracted with isometric carbon disulfide (CDS)/acetone mixed solvent to afford extract 1 (E
), which was sequentially extracted with petroleum ether (PE) and CDS to afford extracts 2 (E
) and 3 (E
was gradiently eluted into effluent portions 1 to 5 (EPs 1 to 5) through a silica gel-packed column sequentially with PE, CDS/PE mixed solvents with volume ratio of 3:7, 1:1 and 7:3, and CDS. According to analysis with a gas chromatography/mass spectrometer, in total, 22 alkyl phenyl carbonates were enriched into EP
, and anthraquinone and its two derivatives, nine polycyclic aromatic ketones and two polycyclic aromatic lactones into EP
. Most of the oxygen-containing aromatics are value-added chemicals.
Keywords: subbituminous coal, fractional extraction, gradient elution, oxygen-containing aromatics, OCAs