CHARACTERIZATION OF DISSOLUTION PRODUCTS FROM TWO TURKISH LIGNITES BY1H NMR, IR AND GC TECHNIQUES
作者:
Kadim Ceylan,
期刊:
Fuel Science and Technology International
(Taylor Available online 1991)
卷期:
Volume 9,
issue 5
页码: 507-536
ISSN:0884-3759
年代: 1991
DOI:10.1080/08843759108942282
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Some structural features of the dissolution products from two Turkish lignites ( Beypazari and Tuncbi-lek lignites) have been investigated with proton nuclear magnetic resonance and infra-red spectroscopies and gas chromatography. The results indicate that, in general, no substantial changes occur in the structural characteristics of the soluble products obtained from different extraction conditions. This is true especially for preasphaltene and asphaltene fractions. On the other hand, some structural differences were observed in the compositions of oil fractions especially in the neutral fraction of oils from the different experimental conditions. The neutral oils from the low temperature and short time extractions are mainly consisted of alkylated aromatics and include a very small quantity of longer chain paraffins. Whereas the oils from the extractions at high temperatures and longer times include several long straight-chain paraffins (C15 - C32) with higher quantity. Hydrogen atmosphere is moderately effective for deoxygenation of the products. Dealkylation reactions for smaller molecules are insignificant but hydrogen atmosphere is relatively effective for the dealkylation of larger molecules. Higher temperature and longer extraction period accelerate the liquid phase pyrolysis.
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