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Depolymerization of PMMA-Based Dental Resin Scraps on Different Production Scales

Author

Listed:
  • Haroldo Jorge da Silva Ribeiro

    (Graduate Program of Natural Resources Engineering of Amazon, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, Brazil)

  • Armando Costa Ferreira

    (Graduate Program of Natural Resources Engineering of Amazon, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, Brazil)

  • Caio Campos Ferreira

    (Graduate Program of Natural Resources Engineering of Amazon, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, Brazil)

  • Lia Martins Pereira

    (Graduate Program of Natural Resources Engineering of Amazon, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, Brazil)

  • Marcelo Costa Santos

    (Graduate Program of Natural Resources Engineering of Amazon, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, Brazil)

  • Lauro Henrique Hamoy Guerreiro

    (Graduate Program of Civil Engineering, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, Brazil)

  • Fernanda Paula da Costa Assunção

    (Graduate Program of Civil Engineering, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, Brazil)

  • Sílvio Alex Pereira da Mota

    (Graduate Program of Chemistry, Universidade Federal do Sul e Sudeste do Pará, Folha 31, Quadra 7, Lote Especial—Nova Marabá, Marabá 68507-590, Brazil)

  • Douglas Alberto Rocha de Castro

    (Centro Universitário Luterano de Manaus—CEULM/ULBRA, Avenida Carlos Drummond de Andrade N°. 1460, Manaus 69077-730, Brazil)

  • Sergio Duvoisin

    (Faculty of Chemical Engineering, Universidade do Estado do Amazonas-UEA, Avenida Darcy Vargas N°. 1200, Manaus 69050-020, Brazil)

  • Luiz Eduardo Pizarro Borges

    (Laboratory of Catalyst Preparation and Catalytic Cracking, Section of Chemical Engineering, Instituto Militar de Engenharia-IME, Praça General Tibúrcio N°. 80, Rio de Janeiro 22290-270, Brazil)

  • Nélio Teixeira Machado

    (Graduate Program of Natural Resources Engineering of Amazon, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, Brazil
    Graduate Program of Civil Engineering, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, Brazil
    Faculty of Sanitary and Environmental Engineering, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Corrêa N° 1, Belém 66075-900, Brazil)

  • Lucas Pinto Bernar

    (Graduate Program of Natural Resources Engineering of Amazon, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa N° 1, Belém 66075-110, Brazil)

Abstract

This research explores the depolymerization of waste polymethyl methacrylate (PMMAW) from dental material in fixed bed semi-batch reactors, focusing on three production scales: laboratory, technical and pilot. The study investigates the thermal degradation mechanism and kinetics of PMMAW through thermogravimetric (TG) and differential scanning calorimetry (DSC) analyses, revealing a two-step degradation process. The heat flow during PMMAW decomposition is measured by DSC, providing essential parameters for designing pyrolysis processes. The results demonstrate the potential of DSC for energetic analysis and process design, with attention to standardization challenges. Material balance analysis across the production scales reveals a temperature gradient across the fixed bed negatively impacting liquid yield and methyl methacrylate (MMA) concentration. Reactor load and power load variables are introduced, demonstrating decreased temperature with increased process scale. The study identifies the influence of temperature on MMA concentration in the liquid fraction, emphasizing the importance of controlling temperature for efficient depolymerization. Furthermore, the research highlights the formation of aromatic hydrocarbons from the remaining char, indicating a shift in liquid composition during the depolymerization process. The study concludes that lower temperatures below 450 °C favor liquid fractions rich in MMA, suggesting the benefits of lower temperatures and slower heating rates in semi-batch depolymerization. The findings contribute to a novel approach for analyzing pyrolysis processes, emphasizing reactor design and economic considerations for recycling viability. Future research aims to refine and standardize the analysis and design protocols for pyrolysis and similar processes.

Suggested Citation

  • Haroldo Jorge da Silva Ribeiro & Armando Costa Ferreira & Caio Campos Ferreira & Lia Martins Pereira & Marcelo Costa Santos & Lauro Henrique Hamoy Guerreiro & Fernanda Paula da Costa Assunção & Sílvio, 2024. "Depolymerization of PMMA-Based Dental Resin Scraps on Different Production Scales," Energies, MDPI, vol. 17(5), pages 1-25, March.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:5:p:1196-:d:1350092
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    References listed on IDEAS

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    1. Gérson Daniel Valdez & Flávio Pinheiro Valois & Sammy Jonatan Bremer & Kelly Christina Alves Bezerra & Lauro Henrique Hamoy Guerreiro & Marcelo Costa Santos & Lucas Pinto Bernar & Waldeci Paraguassu F, 2023. "Improving the Bio-Oil Quality of Residual Biomass Pyrolysis by Chemical Activation: Effect of Alkalis and Acid Pre-Treatment," Energies, MDPI, vol. 16(7), pages 1-18, March.
    2. Fatih Demirbas, M., 2009. "Biorefineries for biofuel upgrading: A critical review," Applied Energy, Elsevier, vol. 86(Supplemen), pages 151-161, November.
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