Chemical characteristics of supercritical toluene extracts from two turkish lignites
Fuel Science and Technology International, vol.9, no.7, pp.825-837, 1991 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 9 Issue: 7
- Publication Date: 1991
- Doi Number: 10.1080/08843759108942298
- Journal Name: Fuel Science and Technology International
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.825-837
- Ankara University Affiliated: Yes
Abstract
Samples from two major deposits of Turkish lignites were subjected to supercritical toluene extraction at 325°C and 14.1 MPa in an autoclave. The resultant extracts were separated into pre-asphaltene, asphaltene, saturates, aromatics and resin fractions by column chromatography. The fractions were characterized by 1H-NMR, 13C-NIVIR IR, and elemental analysis in order to compare the chemical composition of extracts from the two coal samples. The results show that the extracts from the Tungbilek (T-coal) deposits contain aliphatic constituent which is composed of mostly long chain unbranched alkyl compounds while the extracts from the Soma Merkeg (S-coal) deposits contain a significant amount of branched paraffinic compounds. The resin fractions from both samples were found to contain a significant amount of single ring aromatic compounds. Copyright © 1991, Taylor & Francis Group, LLC. All rights reserved.