Kinetic Study of Low Density Polyethylene Using Thermogravimetric Analysis, Part 2: Isothermal Study

Kple, Melhyas; Girods, Pierre; Fagla, Benoît; Anjorin, Malahimi; Ziegler-Devin, Isabelle; Rogaume, Yann

doi:10.1007/s12649-016-9590-5

Cited by 10 publications

(5 citation statements)

References 39 publications

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“…Additionally, a significant lateral shift to higher temperature occurred when the heating rate increased in the MLR and TG curves. It may be caused by the pyrolysis mechanism transformation when the heating rate increased [20,44].…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

“…T o , T e and T m were proposed for evaluating the plastic pyrolysis process [20]. As listed in Table 3, due to the pyrolysis mechanisms transformation [20,44], T o , T e and T m of PE, WPE and WP increased with the heating rate. For instance, the onset temperature T o of PE, WPE and WP increased from 699 to 719 K, 700 to 725 K and 697 to 723 K gradually when the heating rate increased from 5 to 20 K/ min.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

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Investigating Waste Plastic Pyrolysis Kinetic Parameters by Genetic Algorithm Coupled with Thermogravimetric Analysis

Pan

Duque

Debenest

2020

Waste Biomass Valor

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Pyrolysis of waste plastic (WP) is a promising method to solve the plastic pollution issue. WP is mainly composed of polyethylene (PE). Moreover, the products of waste polyethylene (WPE) pyrolysis could serve as high quality fuels and the feedstocks of petrochemicals. Therefore, it is essential to investigate the WPE and WP pyrolysis process. This study evaluates pure PE, WPE and WP pyrolysis kinetic parameters by the use of genetic algorithm (GA) and isoconversional methods coupled with thermogravimetric analysis (TGA), respectively. Additionally, three representative reaction models, i.e. reaction-order, extended Prout-Tompkins and Sestak-Berggren models, are investigated for obtaining the most suitable model, which could describe the PE, WPE and WP pyrolysis process more accurately. Consequently, the reaction-order model turns out to be the optimal method for appropriately describing PE, WPE and WP pyrolysis processes. Hence, the pyrolysis parameters optimized by GA are proven to be accurate and reliable, in comparison of calculated values of activation energy by isoconversional methods and experimental data. Moreover, it might be applicable of GA coupled with TGA with reaction-order model to the future industrial WPE and WP pyrolysis circumstances that have variable heating rates.

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Section: Thermogravimetric Analysismentioning

confidence: 99%

Section: Thermogravimetric Analysismentioning

confidence: 99%

Investigating Waste Plastic Pyrolysis Kinetic Parameters by Genetic Algorithm Coupled with Thermogravimetric Analysis

Pan

Duque

Debenest

2020

Waste Biomass Valor

View full text Add to dashboard Cite

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“…Two of the most used methods for obtaining kinetic parameters are the model‐fitting and the model‐free methods. The model‐fitting method is based on the use of a proposed kinetic model, estimating the kinetic parameters directly from the TGA results by fitting the model data to the experimental data, making it broadly applied to research investigations 3–10 . The Coats‐Redfern equation uses an integration of the Arrhenius equation, using an integral form of the reaction model, and allows the estimation of the activation energy.…”

Section: Introductionmentioning

confidence: 99%

Kinetic analysis of the degradation of HDPE+PP polymer mixtures

Briceno

Lemos

2021

Int J of Chemical Kinetics

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An in depth understanding of the kinetics of the decomposition of plastic mixtures is necessary to enhance chemical recycling approaches, in particular by pyrolysis. The fact that plastic waste is usually composed of mixtures of plastics constitutes a hindrance for secondary recycling but may not be a particular difficulty for tertiary recycling. In this study, an analysis of the thermal degradation of mixtures of high‐density polyethylene (HDPE) and polypropylene (PP), in different proportions, was carried‐out under pyrolysis conditions using thermogravimetric analysis (TGA) under nonisothermal conditions, at different heating rates. Both isoconversional and model‐fitting approaches were used to estimate kinetic parameters from the experimental information. It was found that both the degradation of HDPE and PP, as well as their mixtures, can be described by a single‐step degradation process but that the degradation process is influenced by the proportion between the two plastics. The HDPE/PP mixtures in which PP has a higher ratio than HDPE cause the degradation onset temperature for the mixture to be lower than either pure PP or pure HDPE. Also, it was found that the apparent activation energy estimated was lower for these mixtures in comparison with the pure polymers. This implies that there are extensive interactions between the plastics during the degradation procedure and, from an operational point of view, it may be actually easier to degrade plastic mixtures than the corresponding pure streams, a conclusion that is important in the context of tertiary recycling of plastic mixtures. Furthermore, it was observed that a compensation effect exists that encompasses all the kinetic data for the mixtures, regardless of the composition, indicating that, although significant changes occur in relation to the activation energy, the underlying degradation mechanism remains the same.

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“…48 The weight loss at 250 C for plastic was because of the melting/evaporation, which further decomposed at high temperature. 49,50 The decomposition of the mixed feedstock started from 250 C and declined with almost a fixed weight decrease rate, showing a different TG trend compared with the single feedstock TG-MS analysis.…”

Section: Fourier Transform Infraredmentioning

confidence: 99%

Gasification of wastes: The impact of the feedstock type and co‐gasification on the formation of volatiles and char

et al. 2020

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Summary A gasification pilot plant was built up in order to investigate the influence of both feedstock type and co‐gasification on the distribution and composition of the products. The results showed that at the same process condition, different feedstocks could result in different product yields. For instance, the highest gas yield was obtained from tire gasification, while the lowest one belonged to weed gasification. The characterization of the products showed the presence of different components and functionalities in the samples produced. In addition, the co‐gasification of the feedstocks resulted in the products with different specifications than single feeding, proving the existence of different reaction pathways. This means that feedstocks and their derivatives could interact with each other and resulted in nonproportional yields and composition for the char, tar, and gaseous products in comparison with the products from the gasification of the single feedstocks. As an example, the tar from co‐gasification had a lower content of acids but a higher content of amines and amides. This confirmed that co‐gasification influenced the reaction network significantly, impacting the formation of gases, tar, and char, originated from the cross‐interaction among the reaction intermediates derived from the pyrolysis/gasification of the various feedstocks.

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Kinetic Study of Low Density Polyethylene Using Thermogravimetric Analysis, Part 2: Isothermal Study

Cited by 10 publications

References 39 publications

Investigating Waste Plastic Pyrolysis Kinetic Parameters by Genetic Algorithm Coupled with Thermogravimetric Analysis

Investigating Waste Plastic Pyrolysis Kinetic Parameters by Genetic Algorithm Coupled with Thermogravimetric Analysis

Kinetic analysis of the degradation of HDPE+PP polymer mixtures

Gasification of wastes: The impact of the feedstock type and co‐gasification on the formation of volatiles and char

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