Keywords: lignite, thermal dissolution, column chromatography, organic compounds, separation, identification, methanol, benzene, solvents
Separation and identification of organic compounds from thermally dissolved Shengli lignite in a methanol/benzene mixed solvent
Thermal dissolution of Shengli lignite was conducted in a methanol/benzene mixed solvent at 240°C for 1 h. The soluble fraction was sequentially eluted with petroleum ether (PE) and carbon disulfide (CDS)/PE mixed solvents with increased CDS to PE ratio through a silica gel–packed column. A series of normal alkanes, polycyclic aromatics, methyl alkanoates, alkanoic acids, and fatty acid amides were enriched to large extents and 6–hydroxy–7–isopropyl–1,1,4a–trimethyl–2,3,4,4a,10, 10a–hexahydrophenanthren–9(1H)–one was successfully separated with high purity by the column chromatography. [Received: November 12 2012; Accepted: February 23, 2013].