Title: Identification of organonitrogen compounds from thermally dissolved Huolinguole lignite in ethanol

Authors: Yu-Gao Wang; Xian-Yong Wei; Hong-Lei Yan; Zhi-Min Zong

Addresses: Key Laboratory of Coal Processing and Efficient Utilisation, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, Jiangsu, China ' Key Laboratory of Coal Processing and Efficient Utilisation, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, Jiangsu, China ' Key Laboratory of Coal Processing and Efficient Utilisation, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, Jiangsu, China ' Key Laboratory of Coal Processing and Efficient Utilisation, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, Jiangsu, China

Abstract: 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 (EF₁-EF₅) 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 EF₂ and EF₃ 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; Huolinguole lignite; column chromatography; ethanol; alkyl pyridines.

DOI: 10.1504/IJOGCT.2014.064431

International Journal of Oil, Gas and Coal Technology, 2014 Vol.8 No.1, pp.93 - 103

Received: 25 Apr 2013
Accepted: 20 Feb 2014
Published online: 18 Sep 2014 *

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