Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 96, Issue -, Pages 54-62Publisher
ELSEVIER
DOI: 10.1016/j.jaap.2012.03.004
Keywords
Stepwise pyrolysis; Feedstock recycling; Catalytic decomposition; Plastic waste; ZSM-5 zeolite; Dechlorination
Funding
- Spanish Ministry of Education and Science (MEC) [CTQ 2007-67070/PPQ]
- Basque Country Government [ETORTEK 2007 IE07-207, GIC 07-09-IT-354-07]
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In this paper the combination of catalytic and stepwise pyrolysis is explored. A mixture of polyethylene (PE), polypropylene (PP), polystyrene (PS), poly(ethylene terephthalate) (PET) and poly(vinyl chloride) (PVC), which resembles real municipal plastic waste, has been pyrolysed in a 3.5 dm(3) semi-batch reactor at 440 degrees C for 30 min using a ZSM-5 zeolite as catalyst. A low temperature (300 degrees C) dechlorination step has been carried out both with and without catalyst. It has been proved that the application of such dechlorination step gives rise to a 75 wt% reduction of chlorine in the liquid fraction. However, such step has a negative influence on the catalyst, which loses some catalytic activity. The optimum procedure in terms of quality and chlorine content of the products is the combination of first a low temperature step without catalyst, and second the catalytic pyrolysis step. (C) 2012 Elsevier B.V. All rights reserved.
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