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Determination of the thermodynamic parameters of the pyrolysis process of post-consumption thermoplastics by non-isothermal thermogravimetric analysis

  • Dades identificatives

    Identificador: imarina:9242318
    Autors:
    Palmay PPuente CBarzallo DBruno JC
    Resum:
    Currently, the pyrolysis process is an important technology for the final treatment of plastic waste worldwide. For this reason, knowing in detail the chemical process and the thermodynamics that accompany cracking reactions is of utmost importance. The present study aims to determine the thermodynamic parameters of the degradation process of conventional thermoplastics (polystyrene (PS), polyethylene terephthalate (PET), high-density polyethylene (HDPE), polypropylene (PP) and polyvinyl chloride (PVC)) from the study of their chemical kinetics by thermogravimetric analysis (TG). Non-isothermal thermogravimetry was performed at three heating rates from room temperature to 550?C with an inert nitrogen atmosphere with a flow of 20 mL min?1. Once the TG data is obtained, an analysis is carried out with the isoconversional models of Friedman (FR), Kissinger–Akahira–Sunose (KAS), and Flynn–Wall–Ozawa (FWO) in order to determine the one that best fits the experimental data, and with this, the calculation of the activation energy and the pre-exponential factor is performed. The validation of the model was carried out using the correlation factor, determining that the KAS model is the one that best adjusts for the post-consumer thermoplastic degradation process at the three heating rates. With the use of the kinetic parameters, the variation of the Gibbs free energy is determined in each of the cases, where it is necessary that for structures containing aromatic groups a lower energy is presented, which implies a relative ease of degradation compared to the linear structures. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
  • Altres:

    Autor segons l'article: Palmay P; Puente C; Barzallo D; Bruno JC
    Departament: Enginyeria Mecànica
    Autor/s de la URV: Bruno Argilaguet, Juan Carlos
    Paraules clau: Waste treatment Thermoplastics Thermogravimetric analysis Thermodynamic parameters Thermodynamic parameter Thermal-degradation kinetics Reinforced plastics Pyrolysis process Polyvinyl chlorides Polyethylene terephthalates Plastics waste Plastic bottles Nonisothermal Kissinger Kinetics parameter Kinetic parameters Isotherms Isothermal thermo-gravimetric analysis Heating rate Gibbs free energy Free energy Degradation temperatures Degradation temperature Degradation process Cracking (chemical) Chlorine compounds Chemical process Activation energy thermoplastics temperature polystyrene polypropylene polyethylene plastic waste model kinetic parameters fuel degradation temperature catalytic pyrolysis behaviors
    Resum: Currently, the pyrolysis process is an important technology for the final treatment of plastic waste worldwide. For this reason, knowing in detail the chemical process and the thermodynamics that accompany cracking reactions is of utmost importance. The present study aims to determine the thermodynamic parameters of the degradation process of conventional thermoplastics (polystyrene (PS), polyethylene terephthalate (PET), high-density polyethylene (HDPE), polypropylene (PP) and polyvinyl chloride (PVC)) from the study of their chemical kinetics by thermogravimetric analysis (TG). Non-isothermal thermogravimetry was performed at three heating rates from room temperature to 550?C with an inert nitrogen atmosphere with a flow of 20 mL min?1. Once the TG data is obtained, an analysis is carried out with the isoconversional models of Friedman (FR), Kissinger–Akahira–Sunose (KAS), and Flynn–Wall–Ozawa (FWO) in order to determine the one that best fits the experimental data, and with this, the calculation of the activation energy and the pre-exponential factor is performed. The validation of the model was carried out using the correlation factor, determining that the KAS model is the one that best adjusts for the post-consumer thermoplastic degradation process at the three heating rates. With the use of the kinetic parameters, the variation of the Gibbs free energy is determined in each of the cases, where it is necessary that for structures containing aromatic groups a lower energy is presented, which implies a relative ease of degradation compared to the linear structures. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
    Àrees temàtiques: Polymers and plastics Polymer science Odontología General chemistry Farmacia Engenharias ii Ciências biológicas ii Chemistry (miscellaneous) Chemistry (all) Biotecnología Astronomia / física
    Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
    Adreça de correu electrònic de l'autor: juancarlos.bruno@urv.cat
    Identificador de l'autor: 0000-0001-7448-5416
    Data d'alta del registre: 2024-07-27
    Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion
    Enllaç font original: https://www.mdpi.com/2073-4360/13/24/4379
    URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
    Referència a l'article segons font original: Polymers. 13 (24):
    Referència de l'ítem segons les normes APA: Palmay P; Puente C; Barzallo D; Bruno JC (2021). Determination of the thermodynamic parameters of the pyrolysis process of post-consumption thermoplastics by non-isothermal thermogravimetric analysis. Polymers, 13(24), -. DOI: 10.3390/polym13244379
    DOI de l'article: 10.3390/polym13244379
    Entitat: Universitat Rovira i Virgili
    Any de publicació de la revista: 2021
    Tipus de publicació: Journal Publications
  • Paraules clau:

    Chemistry (Miscellaneous),Polymer Science,Polymers and Plastics
    Waste treatment
    Thermoplastics
    Thermogravimetric analysis
    Thermodynamic parameters
    Thermodynamic parameter
    Thermal-degradation kinetics
    Reinforced plastics
    Pyrolysis process
    Polyvinyl chlorides
    Polyethylene terephthalates
    Plastics waste
    Plastic bottles
    Nonisothermal
    Kissinger
    Kinetics parameter
    Kinetic parameters
    Isotherms
    Isothermal thermo-gravimetric analysis
    Heating rate
    Gibbs free energy
    Free energy
    Degradation temperatures
    Degradation temperature
    Degradation process
    Cracking (chemical)
    Chlorine compounds
    Chemical process
    Activation energy
    thermoplastics
    temperature
    polystyrene
    polypropylene
    polyethylene
    plastic waste
    model
    kinetic parameters
    fuel
    degradation temperature
    catalytic pyrolysis
    behaviors
    Polymers and plastics
    Polymer science
    Odontología
    General chemistry
    Farmacia
    Engenharias ii
    Ciências biológicas ii
    Chemistry (miscellaneous)
    Chemistry (all)
    Biotecnología
    Astronomia / física
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