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Ahmed I. Osman
Queen's University Belfast Faculty of Engineering and Physical Sciences
Corresponding Author
ORCiD: https://orcid.org/0000-0003-2788-7839
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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 (Ea) values of 165-195 kJ.mol-1, R2 = 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 Mass Spectrometry results showed the pyrolysis gaseous emissions which are C1-hydrocarbon and H-O-C=O along with C2 hydrocarbons, C5- C6 hydrocarbons, acetaldehyde, the fragment of O-CH=CH2, 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 and can be used at numerous scales with a high level of accuracy compared with the literature.
Keywords
Kinetic modelling, Plastic waste, Pyrolysis, Polyethylene terephthalate, Gaseous emissions, Plastic recycling
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This is a list of supplementary files associated with this preprint. Click to download.
- GraphicalAbstract.jpg
- Equations.pdf
- ESIrevised.pdf
Additional file (Supplementary Information): Figure S1: The PET sample used herein. Figure S2: The % integrated mass derived from TGA results of PET pyrolysis at heating rates of 0.5, 1, 2, 4 and 8 °C.min-1. The integration of the DTG curve is shown in yellow and simulation results are shown by black lines. Figure S3: The DSC-TGA thermogram of the PET pyrolysis at heating rate of 0.5 °C.min-1 (a) and °C.min-1 (b) under nitrogen atmosphere. Figure S4: Benzene evolution during the PET pyrolysis.
- ESEUD2000099.zip
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CURRENT STATUS: Published
View the published article at Environmental Sciences Europe.
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Posted 17 Aug, 2020
Community comments: 1
Editorial decision: Accept
On 17 Aug, 2020
Editor assigned
On 12 Aug, 2020
Submission checks complete
On 11 Aug, 2020
Editor invited
On 11 Aug, 2020
Community comments: 1
Editorial decision: Major Revision
On 01 Aug, 2020
Review #2 received
Received 29 Jul, 2020
Review #3 received
Received 29 Jul, 2020
Reviewer #4 agreed
On 23 Jul, 2020
Review #4 received
Received 23 Jul, 2020
Reviewer #3 agreed
On 15 Jul, 2020
Reviewer #2 agreed
On 13 Jul, 2020
Review #1 received
Received 12 Jul, 2020
Reviewers invited
Invitations sent on 11 Jul, 2020
Reviewer #1 agreed
On 11 Jul, 2020
Editor assigned
On 08 Jul, 2020
Editor invited
On 07 Jul, 2020
Submission checks complete
On 20 May, 2020
First submitted
On 19 May, 2020
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Subject Areas
Environmental Engineering
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See the published version of this preprint at Environmental Sciences Europe.
This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research
Ahmed I. Osman
Queen's University Belfast Faculty of Engineering and Physical Sciences
Corresponding Author
ORCiD: https://orcid.org/0000-0003-2788-7839
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
View the published article at Environmental Sciences Europe.
Version 2
Posted 17 Aug, 2020
Community comments: 1
Editorial decision: Accept
On 17 Aug, 2020
Editor assigned
On 12 Aug, 2020
Submission checks complete
On 11 Aug, 2020
Editor invited
On 11 Aug, 2020
Community comments: 1
Editorial decision: Major Revision
On 01 Aug, 2020
Review #2 received
Received 29 Jul, 2020
Review #3 received
Received 29 Jul, 2020
Reviewer #4 agreed
On 23 Jul, 2020
Review #4 received
Received 23 Jul, 2020
Reviewer #3 agreed
On 15 Jul, 2020
Reviewer #2 agreed
On 13 Jul, 2020
Review #1 received
Received 12 Jul, 2020
Reviewers invited
Invitations sent on 11 Jul, 2020
Reviewer #1 agreed
On 11 Jul, 2020
Editor assigned
On 08 Jul, 2020
Editor invited
On 07 Jul, 2020
Submission checks complete
On 20 May, 2020
First submitted
On 19 May, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Environmental Engineering
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at Environmental Sciences Europe.
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 (Ea) values of 165-195 kJ.mol-1, R2 = 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 Mass Spectrometry results showed the pyrolysis gaseous emissions which are C1-hydrocarbon and H-O-C=O along with C2 hydrocarbons, C5- C6 hydrocarbons, acetaldehyde, the fragment of O-CH=CH2, 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 and can be used at numerous scales with a high level of accuracy compared with the literature.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
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