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Characterization of products obtained of waste polyethylene terephthalate by pyrolysis

Environmental Progress and Sustainable Energy, ISSN: 1944-7450, Vol: 41, Issue: 4
2022
  • 12
    Citations
  • 0
    Usage
  • 21
    Captures
  • 0
    Mentions
  • 0
    Social Media
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Metrics Details

  • Citations
    12
    • Citation Indexes
      12
  • Captures
    21

Article Description

In this study, waste polyethylene terephthalate (wPET) was converted to liquid fuel by the pyrolysis method. It was also investigated both effects of microwave pre-treatment and catalyst (sodium borohydride) on total conversion and oil + gas yield. The reaction temperature of 375–425°C and the reaction time of 30 min are sufficient for the pyrolysis of waste plastic samples in a batch reactor. In the pyrolysis of wPETs, the highest oil + gas yield of 45% was obtained under the conditions of reaction temperature of 425°C and reaction time of 30 min. The highest total conversion was 62% of microwave pre-treated wPETs under catalytic conditions. It can be argued that microwave pre-treatment and NaBH influence the oil + gas yield in pyrolysis experiments. According to the gas chromatography–mass spectrometry (GC–MS) analysis results of the oil products, they consist of aromatic, mono and multi-ring aromatic compounds and polyaromatic compounds. Higher heating values of the solid products obtained in pyrolysis are approximately 4000–6000 cal/g. According to X-ray diffraction analysis (XRD) of the solid products, they consist largely of crystalline terephthalic acid (CHO).

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