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Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
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Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
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Process Analysis of PMMA Dental Waste Depolymerization in Semi-Batch Reactors.

Armando Costa Ferreira1, Haroldo Jorge da Silva Ribeiro1, Douglas Alberto Rocha de Castro2

  • 1Graduate Program of Natural Resources Engineering of Amazon, Campus Profissional-UFPA, Universidade Federal do Pará, Rua Augusto Corrêa No. 1, Belém 66075-110, Brazil.

Polymers
|October 16, 2025
PubMed
Summary
This summary is machine-generated.

Chemical recycling of polymethylmethacrylate (PMMA) dental waste via pyrolysis efficiently recovers methyl methacrylate (MMA) monomer. Optimal recovery involves lower temperatures and controlled heating rates, especially in larger-scale reactors to mitigate heat transfer issues.

Keywords:
PMMA wastechar formationdepolymerizationkineticsprocess designpyrolysisreaction mechanismsemi-batch reactorsthermogravimetry

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Polymer Chemistry

Background:

  • Polymethylmethacrylate (PMMA) dental waste presents a significant recycling challenge.
  • Chemical recycling offers a sustainable route to recover valuable monomers from plastic waste.
  • Pyrolysis is a promising thermochemical process for PMMA decomposition.

Purpose of the Study:

  • To investigate the chemical recycling of PMMA dental waste into methyl methacrylate (MMA) monomer using pyrolysis.
  • To analyze the effects of temperature, reactor scale, and heating rate on MMA yield and purity.
  • To provide insights for scaling up PMMA recycling processes.

Main Methods:

  • Laboratory-scale (30 g) and pilot-scale (20 kg) semi-batch fixed-bed reactors were utilized.
  • Pyrolysis experiments were conducted at temperatures ranging from 350 °C to 475 °C.
  • Detailed process analysis, including heating rate and reactor scale effects, was performed.

Main Results:

  • Lower temperatures (e.g., 425 °C) favored MMA recovery with minimal by-products.
  • Higher temperatures increased gas yields and reduced MMA yield due to thermal cracking.
  • Char formation and non-condensable gases increased with reactor scale, indicating heat transfer limitations.

Conclusions:

  • Effective MMA recovery from PMMA dental waste requires lower pyrolysis temperatures and controlled heating rates.
  • Heat transfer limitations in larger reactors necessitate careful process optimization for improved MMA purity and yield.
  • This study supports the industrial scale-up of PMMA recycling for efficient monomer recovery.