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Pyrolysis of composite plastic waste
A M Cunliffe1, N Jones, P T Williams
1Energy and Resources Research Institute, The University of Leeds, Leeds, LS2 9JT, UK.
Environmental Technology
|June 14, 2003
Summary
Pyrolysis of composite plastics like polyester and epoxy resins yields oil, gas, and solid residue. Recovered glass fibers showed reduced tensile strength, especially at higher pyrolysis temperatures.
Area of Science:
- Materials Science
- Chemical Engineering
- Polymer Chemistry
Background:
- Composite plastics are widely used but pose end-of-life challenges.
- Pyrolysis offers a potential route for plastic waste valorization and material recovery.
Purpose of the Study:
- To investigate the pyrolysis behavior of various fiber-reinforced composite plastics.
- To characterize the yields and compositions of pyrolysis products (oil, gas, solid residue).
- To assess the impact of pyrolysis on recovered glass fiber properties.
Main Methods:
- Pyrolysis of polyester, phenolic, epoxy, vinylester, polypropylene, and PET composites in a fixed bed reactor.
- Temperatures ranged from 350 to 800 degrees C.
- Analysis of gas composition, oil products, and solid residue; tensile testing of recovered glass fibers.
Main Results:
- Pyrolysis yields varied depending on the composite type and temperature.
- Calcium carbonate filler decomposed at 800°C, influencing char gasification.
- Polyester, phenolic, and epoxy composites produced aromatic, oxygenated condensates.
- Glass fiber tensile strength decreased with increasing pyrolysis temperature, particularly above 650°C.
Conclusions:
- Pyrolysis is a viable method for breaking down composite plastics.
- The process generates valuable products and can impact filler behavior.
- Glass fiber reinforcement integrity is compromised at elevated pyrolysis temperatures, limiting its direct reuse.