Journal
THERMOCHIMICA ACTA
Volume 538, Issue -, Pages 48-54Publisher
ELSEVIER
DOI: 10.1016/j.tca.2012.03.015
Keywords
Low temperature coal tar; Polymerization; GC-MS; TG-FTIR; Phenolic compounds; Pyrolysis
Funding
- Shaanxi Important Innovative Projects in Science & Technology of China [2009ZKC04-06]
- National Key Technology R&D Program of China [2009BAA20B02]
- Key Science and Technology Program of Shaanxi Province of China [2010K01-082]
- National Natural Science Foundation of China [NSFC21006078]
- Natural Science Foundation of Shannxi Province, China [2011JY006]
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>300 degrees C fraction obtained by distillation of heavy tar of low temperature coal tar was reacted with paraformaldehyde. After reaction, toluene soluble (TS-tar) and toluene insoluble (TIS-tar) fractions were collected. Their structures were confirmed by gas chromatography-mass spectroscopy (GC-MS). gel permeation chromatography (GPC) and Fourier transformed infrared (FTIR). The degradations under nitrogen atmosphere of >300 degrees C fraction and TIS-tar were investigated by thermogravimetric analyzer coupled with Fourier transform infrared spectroscopy (TG-FTIR). Based on the above analyses, polymers were generated and the carbonization yields were increased by polymerization reaction. The degradation process of TIS-tar was divided into two stages, 118-248 degrees C and 248-700 degrees C. In the pyrolysis process of >300 degrees C fraction, CO has no significant absorbency for infrared at 2060-2240 cm(-1), but there are obvious absorption peaks in TIS-tar. Polymerization reaction of paraformaldehyde and compounds with carboxyl, short-chain fatty and ester group in >300 degrees C fraction generates polymers and fixes these compounds. Crown Copyright (c) 2012 Published by Elsevier By. All rights reserved.
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