Inderscience Publishers

Identification of organonitrogen compounds from thermally dissolved Huolinguole lignite in ethanol

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Thermal dissolution of Huolinguole lignite (HL) in ethanol was conducted at 330°C for 2 h. The soluble fraction was sequentially eluted with petroleum ether (PE), ethyl acetate (EA)/PE mixed solvents with increased EA to PE ratio, and EA to afford five eluted fractions (EF
1
-EF
5
) through a silica gel-packed column. In total, 49 organonitrogen compounds (ONCs), including
N
-heterohexacyclic compounds (NHHCCs),
N
-heteropentacyclic compounds, nitrogen-containing group-substituted benzenes (NCGSBs), condensed
N
-heterocyclic compounds, and amides were detected in EF
2
and EF
3
with a gas chromatography/mass spectrometer. Among the ONCs, NHHCCs are dominant and most of them are alkyl pyridines (APs), suggesting that APs are the main existing modes of ONCs in HL. As the main NCGSBs, anilines may originally exist in HL or were released by HL ethanolysis. This investigation provides an effective approach for understanding the modes of ONC occurrences in lignites. [Received: April 11, 2013; Accepted: February 20, 2014]

Keywords: thermal dissolution, organonitrogen compounds, ONCs, lignite, column chromatography

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