Degradation kinetic study of pyrolysis and co-pyrolysis of biomass with polyethylene terephthalate (PET) using Coats–Redfern method

Ganeshan, Gautam; Shadangi, Krushna Prasad; Mohanty, Kaustubha

doi:10.1007/s10973-017-6597-5

Cited by 66 publications

(36 citation statements)

References 29 publications

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“…As the operating parameters can shift the product composition and alter the reaction pathway, it is important to use kinetic modelling to help describe the reaction mechanism during the thermal cracking of plastic polymers. Ganeshan et al [28], in their attempt to understand the PET pyrolysis process via kinetic modelling, used Coats-Redfern method that assumes the reaction is first order. They reported activation energies (E a ) value in the range of 133-251 kJ mol −1 ; however, the value of R 2 was low (< 0.8).…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis kinetic modelling of abundant plastic waste (PET) and in-situ emission monitoring

et al. 2020

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Background: Recycling the ever-increasing plastic waste has become an urgent global concern. One of the most convenient methods for plastic recycling is pyrolysis, owing to its environmentally friendly nature and its intrinsic properties. Understanding the pyrolysis process and the degradation mechanism is crucial for scale-up and reactor design. Therefore, we studied kinetic modelling of the pyrolysis process for one of the most common plastics, polyethylene terephthalate (PET). The focus was to better understand and predict PET pyrolysis when transitioning to a low carbon economy and adhering to environmental and governmental legislation. This work aims at presenting for the first time, the kinetic triplet (activation energy, pre-exponential constant, and reaction rate) for PET pyrolysis using the differential iso-conversional method. This is coupled with the in-situ online tracking of the gaseous emissions using mass spectrometry. Results: The differential iso-conversional method showed activation energy (E a) values of 165-195 kJ mol −1 , R 2 = 0.99659. While the ASTM-E698 method showed 165.6 kJ mol −1 and integral methods such as Flynn-Wall and Ozawa (FWO) (166-180 kJ mol −1). The in-situ Mass Spectrometry results showed the gaseous pyrolysis emissions, which are C 1 hydrocarbons and H-O-C=O along with C 2 hydrocarbons, C 5-C 6 hydrocarbons, acetaldehyde, the fragment of O-CH=CH 2 , hydrogen, and water. Conclusions: From the obtained results herein, thermal predictions (isothermal, non-isothermal and step-based heating) were determined based on the kinetic parameters. They can be used at numerous scale with a high level of accuracy compared with the literature.

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Section: Introductionmentioning

confidence: 99%

Pyrolysis kinetic modelling of abundant plastic waste (PET) and in-situ emission monitoring

et al. 2020

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“…Coats-Redfern integral method is a widely applied method 18,19 . By assuming the expression of f α , it can solve the corresponding pre-exponential factors, reaction series and activation energy by TG curve.…”

Section: Dα /Dt Kf αmentioning

confidence: 99%

Process Optimization of Wood Particles Microwave Pyrolysis with Combined Production of Bio-Oil and Syngas

Chen

Song

et al. 2020

J. Oleo Sci.

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IntroductionThe depletion of crude oil resources draws great research attention on renewable energy. Biomass is an alternative energy source because of low sulfur content renewability, and the capability of being converted into bio-fuels, materials or gases with zero carbon footprints. In recent years, significant progress has been made in the development of hydrotreating bio-oil 1 , which enable the bio-oil to replace crude oil products. Moreover, the research on high efficiency catalyst is used for the hydrolysis of lignocellulosic biomass, which also has potential in the field of renewable chemical feedstock 2 . However, in addition to environmental pollution, the applications of traditional heating pyrolyzing method have problems on low utilization, slow heating speed and non-uniform heating, which affect the quality of products significantly.Pretreatment has significant role in the conversion of biomass. Structurally, the bottleneck in biomass pyrolysis is mainly due to lignin seals and crystalline nature of cellulose. At present, a large number of pretreatment methods including physical pretreatment, chemical pretreatment, physiochemical pretreatment and biological pretreatment are available, all of which aim at eliminating lignin seals and

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“…Ganeshan et al [32] in their attempt to understand the PET pyrolysis process via kinetic modelling, used Coats-Redfern method that assumes the reaction is first order. They reported activation energies (Ea) value in the range of 133-251 kJ.mol -1 , however, the value of R 2 was low (<0.8).…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis kinetic modelling of abundant plastic waste (PET) and in-situ emissions monitoring

Osman

Farrell

Al-Muhtaseb

et al. 2020

Preprint

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Background: Recycling the ever-increasing plastic waste has become an urgent global concern. One of the most convenient methods for plastic recycling is pyrolysis, owing to its environmentally friendly nature and its intrinsic properties. Understanding the pyrolysis process and the degradation mechanism is crucial for scale-up and reactor design. Therefore, we studied kinetic modelling of the pyrolysis process for one of the most common plastics, polyethylene terephthalate (PET). The focus was to better understand and predict PET pyrolysis when transitioning to a low carbon economy and adhering to environmental and governmental legislation. This work aims at presenting for the first time, the kinetic triplet (activation energy, pre-exponential constant and reaction rate) for the PET pyrolysis using the differential iso-conversional method. This is coupled with the in-situ online tracking of the gaseous emissions using mass spectrometry. Results: The differential iso-conversional method showed activation energy (E a ) values of 165-195 kJ.mol -1 , R 2 = 0.99659. While the ASTM-E698 showed 165.6 kJ.mol -1 and integral methods such as Flynn-Wall and Ozawa (FWO) (166-180 kJ.mol -1 ). The in-situ MS results showed the pyrolysis gaseous emissions which are C 1 -hydrocarbon and H-O-C=O along with C 2 hydrocarbons, C 5 - C 6 hydrocarbons, acetaldehyde, the fragment of O-CH=CH 2 , hydrogen and water. Conclusions: The kinetic triplet along with the in-situ monitoring of the gaseous emissions of PET pyrolysis can benefit in the process modelling of this system to help better understand the process at scale. This ultimately aids in reactor optimization and design at scale, as it gives a better insight into the reaction mechanism. This can be used by plastic recyclers worldwide and the predictions made in this study can be used to determine how the rate of reaction changes based on temperature and heating rate beyond experimental results both isothermally, non-isothermally and in stepwise heating regimes.

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Degradation kinetic study of pyrolysis and co-pyrolysis of biomass with polyethylene terephthalate (PET) using Coats–Redfern method

Cited by 66 publications

References 29 publications

Pyrolysis kinetic modelling of abundant plastic waste (PET) and in-situ emission monitoring

Pyrolysis kinetic modelling of abundant plastic waste (PET) and in-situ emission monitoring

Process Optimization of Wood Particles Microwave Pyrolysis with Combined Production of Bio-Oil and Syngas

Pyrolysis kinetic modelling of abundant plastic waste (PET) and in-situ emissions monitoring

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