Recovery of benzene-rich oil from the degradation of metal- and metal oxide-containing poly(ethylene terephthalate) composites

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13 Citations (Scopus)

Abstract

Pure poly(ethylene terephthalate) (PET) resin and metal-/metal oxide-containing PET composites were thermally decomposed in the presence of Ca(OH)2 using a tube reactor. The effects of batch and continuous processing, the presence of Ca(OH)2, and PET size on benzene production were investigated. A maximum benzene yield and purity of 82.9 % and 78.8 wt%, respectively, were obtained at 700 °C in the presence of Ca(OH)2 when using small PET particles; further, a continuous feed reactor was favored over a batch reactor. Effective contact between PET and Ca(OH)2 was important in the PET degradation, which promoted hydrolysis of PET and decarboxylation of terephthalic acid, whereas pyrolysis was suppressed. Furthermore, the results of thermal decomposition of PET-based waste-PET-based X-ray films, magnetic tape, and prepaid cards-indicated that the metal and metal oxides contained in the waste had no significant catalytic effect on PET degradation or on the recovery of benzene-rich oil in the presence of Ca(OH)2.

Original languageEnglish
Pages (from-to)282-290
Number of pages9
JournalJournal of Material Cycles and Waste Management
Volume16
Issue number2
DOIs
Publication statusPublished - 2014 Apr

Keywords

  • Benzene-rich oil
  • Calcium oxide
  • Feedstock recycling
  • Hydrolysis
  • Terephthalic acid

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Mechanics of Materials

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