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Separation and Identification of Conventional Microplastics from Farmland Soils
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Polyethylene Recovery from Multilayer Plastic Packaging Waste.

Anareth Cavuquila1, Luanna Maia1,2,3, Germano A Carreira4

  • 1CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.

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|March 14, 2026
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Summary
This summary is machine-generated.

This study developed a toluene-based dissolution-precipitation process to recycle multilayer plastic packaging waste (MPPW). The optimized method efficiently recovers polyethylene (PE) suitable for recycling, addressing a significant waste management challenge.

Keywords:
design of experimentsdissolution–precipitationplastic recyclingresponse surface methodology

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Multilayer plastic packaging waste (MPPW) poses significant waste management challenges due to its complex structure.
  • Conventional recycling methods are hindered by variations in polymer composition and layer structure, leading to landfilling or incineration.
  • Effective recycling of MPPW is crucial for reducing environmental pollution and conserving resources.

Purpose of the Study:

  • To develop and optimize a dissolution-precipitation process for recovering polyethylene (PE) from MPPW.
  • To identify optimal operating conditions for maximizing PE recovery yield and purity.
  • To assess the industrial scalability of the developed recycling process.

Main Methods:

  • Utilized toluene as a solvent for the dissolution-precipitation of MPPW.
  • Employed Design of Experiments (DoEs) and Response Surface Methodology (RSM) for process optimization.
  • Investigated the influence of temperature, dissolution time, solvent-to-waste ratio, and agitation speed.

Main Results:

  • Achieved PE recovery with less than 5 wt% polypropylene (PP), meeting recycling quality standards.
  • Identified temperature as the most influential parameter on dissolution yield and polymer purity.
  • Optimal conditions (100 °C, 30 min, 400 rpm, 15 mL/g) yielded 39.1% recovery with 97.7 wt% PE and 2.3 wt% PP.

Conclusions:

  • The toluene-based dissolution-precipitation process offers an effective route for PE recovery from MPPW.
  • The optimized process demonstrates potential for industrial-scale implementation using standard unit operations.
  • This method provides a viable solution for managing MPPW and promoting a circular economy for plastics.