Pyrolysis studies of PP/PE/PS/PVC/HIPS-Br plastics mixed with PET and dehalogenation (Br, Cl) of the liquid products

Thallada Bhaskar, Jun Kaneko, Akinori Muto, Yusaku Sakata, Emma Jakab, Toshiki Matsui, Md Azhar Uddin

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101 Citations (Scopus)


Pyrolysis of polypropylene (PP)/polyethylene (PE)/polystyrene (PS)/poly(vinyl chloride) (PVC)/high impact polystyrene with brominated flame retardant (HIPS-Br) plastics mixed with poly(ethylene terephthalate) (PET) was performed at 430°C under atmospheric pressure using a semi-batch operation. The presence of PET in the pyrolysis mixture of PP/PE/PS/PVC/HIPS-Br affected significantly the formation of decomposition products and the decomposition behavior of the plastic mixture. We observed the following effects of PET on the pyrolysis of PP/PE/PS/PVC/HIPS-Br mixed plastics: (i) the yield of liquid product decreased and the formation of gaseous products increased; (ii) a waxy residue was formed in addition to the solid carbon residue; (iii) the formation of SbBr3 was not detected in liquid products; (iv) the yield of chlorinated branched alkanes increased as well as vinyl bromide and ethyl bromide were formed. The use of calcium carbonate carbon composite (Ca-C) completely removed the chlorine and bromine content from the liquid products during PP/PE/PS/PVC/HIPS-Br pyrolysis, however in the presence of PET, the catalytic experiment (Ca-C, 8g) yielded liquid products containing 310ppm of Br and 20ppm of Cl. In addition, the Ca-C increased the yield of liquid products about 3-6wt.%, as well as enhanced the gaseous product evolution and decreased the yield of residue. The halogen free liquid hydrocarbons can be used as a feedstock in a refinery or as a fuel.

Original languageEnglish
Pages (from-to)27-33
Number of pages7
JournalJournal of Analytical and Applied Pyrolysis
Issue number1
Publication statusPublished - Aug 2004
Externally publishedYes


  • Calcium carbonate
  • Dehalogenation
  • Flame retardant
  • HIPS-Br
  • PET
  • Pyrolysis

ASJC Scopus subject areas

  • Analytical Chemistry
  • Fuel Technology


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