Co-pyrolysis of Waste Engine Oil with HPDE Plastic in the Presence of Catalysts
Keywords:
pyrolysis, waste engine oil, HDPE, activated carbon, perliteAbstract
This research focused on the co-pyrolysis process of Waste Engine Oil--WEO with HDPE plastic using activated carbon and perlite as catalysts. The objective is to study the effects of WEO:HDPE ratios and catalyst amounts on the yields and chemical properties of pyrolysis oil. The WEO:HDPE ratios were 1:0, 1:0.25 and 1:0.5, and the amounts of catalysts were 5 wt%, 10 wt% and 15 wt%. The results show that in WEO pyrolysis without HDPE plastic, the yield of pyrolysis oil increases from 82.37% to 84.36% and 87.56% with the presence of perlite and activated carbon, respectively, compared with non-catalytic pyrolysis. In the case of co-pyrolysis of WEO with HDPE plastic, the suitable ratio and amount of catalyst could result in a higher yield of pyrolysis oil. It was found that at the ratio of 1:0.25 and using 10 wt% activated carbon, the highest pyrolysis oil yield of 79.44% was obtained. We obtained an 81.20% pyrolysis oil yield at a ratio of 1:0.50 and using 10% perlite. However, the excessive amount of activated carbon catalyst and high ratio of WEO to HDPE could produce wax and a large amount of incondensable gas, resulting in a lower yield of pyrolysis oil. This also caused a higher viscosity and specific gravity than the standard value of diesel oil. Using perlite as a catalyst, on the other hand, produced pyrolysis oil with the viscosity and specific gravity of diesel oil. However, the flash point of all samples was much lower than the standard and must be improved in the future study. Finally, using a higher WEO:HDPE ratio could result in pyrolysis oil with a high kerosene and gas oil content.
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