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Titolo:
Pyrolysis kinetics of waste PVC pipe
Autore:
Kim, S;
Indirizzi:
Hallym Univ, Dept Environm Sci, Chunchon 200702, Kangwon, South Korea Hallym Univ Chunchon Kangwon South Korea 200702 702, Kangwon, South Korea
Titolo Testata:
WASTE MANAGEMENT
fascicolo: 7, volume: 21, anno: 2001,
pagine: 609 - 616
SICI:
0956-053X(2001)21:7<609:PKOWPP>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
THERMAL-DECOMPOSITION BEHAVIOR; POLY(VINYL CHLORIDE); PLASTISOLS;
Keywords:
waste PVC pipe; pyrolysis kinetics; reaction model; additives;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Kim, S Hallym Univ, Dept Environm Sci, 1 Okchon Dong, Chunchon 200702, Kangwon, South Korea Hallym Univ 1 Okchon Dong Chunchon Kangwon South Korea 200702 Korea
Citazione:
S. Kim, "Pyrolysis kinetics of waste PVC pipe", WASTE MAN, 21(7), 2001, pp. 609-616

Abstract

The pyrolysis kinetics of waste PVC pipe was investigated with a thermal gravimetric analysis system at heating rates of 5, 10, and 30 degreesC/min in a nitrogen atmosphere. Freeman-Carroll method was employed to evaluate kinetic parameters. Two dominant peaks were observed on derivative gravimetric curves, hypothetically suggesting a two-stage apparent reaction model. The first-stage reaction was likely to be represented by stoichiometric reaction to yield volatiles (mainly HCl) and intermediates. The second-stage reaction might be described by thermal degradation of intermediates competitively into gas, liquid, and solid by-products. Quasi-isothermal operations were introduced to verify the reaction types of the first and second reaction. The generation reaction of intermediates achieved at lower temperatures was carried out independently with their decomposition reaction at higher temperatures. The effects of additives on the pyrolysis kinetics of waste PVCpipe seem to be significant, especially on the first-stage reaction. The first-stage reaction was retarded. A merged peak at low temperatures was observed on the derivative thermogravimetry (DTG) curve instead of two peaks usually observed for that of pure PVC resin. The first peak on the DTG curveof pure PVC resin may shift more, resulting in the complete overlap of twopeaks. The quantity of evolved HCl was likely to decrease because of interaction of metal components of stabilizers with either HCl or active chlorine atom or both. The final residual fraction increased as a result of pyrolysis of organic forms of additives to yield extra char. On the other hand, the second-stage reaction kinetics demonstrates a similar pattern to that ofpure PVC resin, implying that the effects of additives may be less significant in comparison with that at the first-stage reaction. (C) 2001 ElsevierScience Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 19:14:56