Kinetics of pyrolysis of high density polyethylene. Comparison of isothermal and dynamic experiments

Ceamanos, J.; Mastral, J.F.; Millera, Ángela; Aldea, M.E.

doi:10.1016/s0165-2370(01)00183-8

Cited by 135 publications

(75 citation statements)

References 43 publications

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“…This can be explained with a kinetic compensation effect that can be expressed as a linear relationship between the logarithm of the pre-exponential factor and the activation energy (ln(A) = kE + b). This effect is mainly due to mathematical, physio-chemical, and experimental causes, which is widely researched [32,33]. Although this coupling of the kinetic parameters can result in similar values of the kinetic constant, the lower activation energy indicates the energy required to activate molecules to start the chemical reaction is lower because chemical reaction occurs on the condition that the molecular energy is equal to or higher than the activation energy.…”

Section: Conventional Pyrolysis Of Wpcbs Using Tgamentioning

confidence: 99%

Kinetic Study of the Pyrolysis of Waste Printed Circuit Boards Subject to Conventional and Microwave Heating

et al. 2012

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This paper describes a kinetic study of the decomposition of waste printed circuit boards (WPCB) under conventional and microwave-induced pyrolysis conditions. We discuss the heating rates and the influence of the pyrolysis on the thermal decomposition kinetics of WPCB. We find that the thermal degradation of WPCB in a controlled conventional thermogravimetric analyzer (TGA) occurred in the temperature range of 300 °C-600 °C, where the main pyrolysis of organic matter takes place along with an expulsion of volumetric volatiles. The corresponding activation energy is decreased from 267 kJ/mol to 168 kJ/mol with increased heating rates from 20 °C/min to 50 °C/min. Similarly, the process of microwave-induced pyrolysis of WPCB material manifests in only one stage, judging by experiments with a microwave power of 700 W. Here, the activation energy is determined to be only 49 kJ/mol, much lower than that found in a conventional TGA subject to a similar heating rate. The low activation energy found in microwave-induced pyrolysis suggests that the adoption of microwave technology for the disposal of WPCB material and even for waste electronic and electrical equipment (WEEE) could be an attractive option.

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Section: Conventional Pyrolysis Of Wpcbs Using Tgamentioning

confidence: 99%

Kinetic Study of the Pyrolysis of Waste Printed Circuit Boards Subject to Conventional and Microwave Heating

et al. 2012

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“…This linear heating rate program is the most widely used [28]. In any case, it is not uncommon to find in the literature a serious disagreement between the kinetic parameters calculated from data obtained under isothermal and non-isothermal conditions [26,29,30]. Sample Controlled Thermal Analysis (SCTA) constitutes an interesting non isothermal method which has been rarely applied to the kinetic analysis of thermal degradation of polymers [31].…”

Section: Introductionmentioning

confidence: 99%

“…Because of this complexity, a large number of papers found in the literature assume first order or norder kinetic models to describe the thermal degradation of polymers [8,23,30,34,[37][38][39][40][41][42][43][44][45], what would entail a non realistic description of the real reaction leading to erroneous kinetic parameters. Combined kinetic analysis is a procedure recently proposed that allows for the simultaneous analysis of a set of experimental curves recorded under any thermal schedule [27,[46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Combined kinetic analysis of thermal degradation of polymeric materials under any thermal pathway

Jiménez

Pérez‐Maqueda

Criado

2009

Polymer Degradation and Stability

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Combined kinetic analysis has been applied for the first time to the thermal degradation of polymeric materials. The combined kinetic analysis allows the determination of the kinetic parameter from the simultaneous analysis of a set of experimental curves recorded under any thermal schedule. Besides, the method does not make any assumption about the kinetic model or activation energy and allows the analysis even when the process does not follow one of the ideal kinetic models already proposed in literature. In the present paper the kinetics of the thermal degradation of both polytetrafluoroethylene (PTFE) and polyethylene (PE) have been performed. It has been concluded, without previous assumptions on the kinetic model, that the thermal degradation of PTFE obeys a first order kinetic law, while the thermal degradation of PE follows a diffusion-controlled kinetic model.

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“…The first step for a suitable design of any pyrolysis reactor is the knowledge of the process kinetics of the input plastic matrices. Many extensive studies on thermal degradation kinetics of single plastics have been carried out [12][13][14][15][16][17][18], and most of them have been developed on the assumption that the reaction can be described by a first or an nth order reaction model. This assumption can result in the Arrhenius parameters deviating from the real ones [19][20][21].…”

mentioning

confidence: 99%

Thermal behavior and pyrolytic degradation kinetics of polymeric mixtures from waste packaging plastics

Tuffi¹,

D'Abramo²,

Cafiero³

et al. 2018

Express Polym. Lett.

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Kinetics of pyrolysis of high density polyethylene. Comparison of isothermal and dynamic experiments

Cited by 135 publications

References 43 publications

Kinetic Study of the Pyrolysis of Waste Printed Circuit Boards Subject to Conventional and Microwave Heating

Kinetic Study of the Pyrolysis of Waste Printed Circuit Boards Subject to Conventional and Microwave Heating

Combined kinetic analysis of thermal degradation of polymeric materials under any thermal pathway

Thermal behavior and pyrolytic degradation kinetics of polymeric mixtures from waste packaging plastics

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