Inderscience Publishers

Enrichment of oxygen-containing aromatics in an extract from Zhundong subbituminous coal

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Zhundong subbituminous coal (ZSBC) was exhaustively extracted with isometric carbon disulfide (CDS)/acetone mixed solvent to afford extract 1 (E
1
), which was sequentially extracted with petroleum ether (PE) and CDS to afford extracts 2 (E
2
) and 3 (E
3
). E
3
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
3
, and anthraquinone and its two derivatives, nine polycyclic aromatic ketones and two polycyclic aromatic lactones into EP
4
. Most of the oxygen-containing aromatics are value-added chemicals.

Keywords: subbituminous coal, fractional extraction, gradient elution, oxygen-containing aromatics, OCAs

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