Catalytic Degradation of Mixed Polymers into Environmental Friendly and Useful Products

Document Type: Original Article


Petroleum University of Technology, Abadan, Iran


By use up novel catalyst the pyrolysis of mixed plastics has been reflected as an effective approach to convert
waste plastics into environmental responsive and industrially valuable hydrocarbon gas and liquid products.
Catalytic degradation is a hopeful alternative for municipal plastic wastes recycling. Further than 97% of a
polymer mixed converted into ignitable hydrocarbon in a catalytic cracking reaction. The products are mostly
middle distillates. In this study equally weighted mixed HDPE (high density polyethylene), LDPE (low
density polyethylene), PP (polypropylene), PS (polystyrene), PVC (polyvinyl chloride), PET (polyethylene
terephthalate were degraded. The reaction occurred in a semi batch reactor at several temperatures and
catalyst/polymer ratios in this investigation, in order that obtain an optimum operating condition. The
products are liquid and gaseous hydrocarbons with negligible of residue. The liquid and gas products were in
the sort of middle distillate cuts of gasoline and diesel. Finally, with a metal base catalyst, yielded 97% of
given mixed to costly middle distillate products that include 84% liquid hydrocarbon (C
5-C10) and 13% gas
1- C4) with less percent of residue. The optimum condition for this yield reports at a temperature of 450 ºC
and 50% of catalyst w/w at atmosphere pressure.