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Pyrolysis of Mixed Plastic Waste: I. Kinetic Study

Plastic wastes have become one of the biggest global environmental issues and thus recycling such massive quantities is targeted. Low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), and polystyrene (PS) are considered among the main types of plastic wastes. Since p...

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Autores principales: Dubdub, Ibrahim, Al-Yaari, Mohammed
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7663054/
https://www.ncbi.nlm.nih.gov/pubmed/33142917
http://dx.doi.org/10.3390/ma13214912
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author Dubdub, Ibrahim
Al-Yaari, Mohammed
author_facet Dubdub, Ibrahim
Al-Yaari, Mohammed
author_sort Dubdub, Ibrahim
collection PubMed
description Plastic wastes have become one of the biggest global environmental issues and thus recycling such massive quantities is targeted. Low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), and polystyrene (PS) are considered among the main types of plastic wastes. Since pyrolysis is one of the most promising recycling techniques, this work aims to build knowledge on the co-pyrolysis of mixed polymers using two model-fitting (Criado and Coats–Redfern) methods. Seventeen co-pyrolysis tests using a thermogravimetric analyzer (TGA) at 60 K/min for different mixed compositions of LDPE, HDPE, PP, and PS were conducted. It was observed that the pyrolysis of the pure polymer samples occurs at different temperature ranges in the following order: PS < PP < LDPE < HDPE. However, compared to pure polymer samples, the co-pyrolysis of all-polymer mixtures was delayed. In addition, the synergistic effect on the co-pyrolysis of polymer blends was reported. The Master plot of the Criado model was used to determine the most suitable reaction mechanism. Then, the Coats–Redfern model was used to efficiently obtain the kinetic parameters (R(2) ≥ 97.83%) and the obtained values of the activation energy of different polymer blends were ranging from 104 to 260 kJ/mol. Furthermore, the most controlling reaction mechanisms were in the following orders: First order reaction (F1), Contracting sphere (R3), and then Contracting cylinder (R2).
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spelling pubmed-76630542020-11-14 Pyrolysis of Mixed Plastic Waste: I. Kinetic Study Dubdub, Ibrahim Al-Yaari, Mohammed Materials (Basel) Article Plastic wastes have become one of the biggest global environmental issues and thus recycling such massive quantities is targeted. Low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), and polystyrene (PS) are considered among the main types of plastic wastes. Since pyrolysis is one of the most promising recycling techniques, this work aims to build knowledge on the co-pyrolysis of mixed polymers using two model-fitting (Criado and Coats–Redfern) methods. Seventeen co-pyrolysis tests using a thermogravimetric analyzer (TGA) at 60 K/min for different mixed compositions of LDPE, HDPE, PP, and PS were conducted. It was observed that the pyrolysis of the pure polymer samples occurs at different temperature ranges in the following order: PS < PP < LDPE < HDPE. However, compared to pure polymer samples, the co-pyrolysis of all-polymer mixtures was delayed. In addition, the synergistic effect on the co-pyrolysis of polymer blends was reported. The Master plot of the Criado model was used to determine the most suitable reaction mechanism. Then, the Coats–Redfern model was used to efficiently obtain the kinetic parameters (R(2) ≥ 97.83%) and the obtained values of the activation energy of different polymer blends were ranging from 104 to 260 kJ/mol. Furthermore, the most controlling reaction mechanisms were in the following orders: First order reaction (F1), Contracting sphere (R3), and then Contracting cylinder (R2). MDPI 2020-10-31 /pmc/articles/PMC7663054/ /pubmed/33142917 http://dx.doi.org/10.3390/ma13214912 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Dubdub, Ibrahim
Al-Yaari, Mohammed
Pyrolysis of Mixed Plastic Waste: I. Kinetic Study
title Pyrolysis of Mixed Plastic Waste: I. Kinetic Study
title_full Pyrolysis of Mixed Plastic Waste: I. Kinetic Study
title_fullStr Pyrolysis of Mixed Plastic Waste: I. Kinetic Study
title_full_unstemmed Pyrolysis of Mixed Plastic Waste: I. Kinetic Study
title_short Pyrolysis of Mixed Plastic Waste: I. Kinetic Study
title_sort pyrolysis of mixed plastic waste: i. kinetic study
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7663054/
https://www.ncbi.nlm.nih.gov/pubmed/33142917
http://dx.doi.org/10.3390/ma13214912
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