Evaluation of energy conversion efficiency and speciation characteristics of pyrolytic oil in catalytic pyrolysis of plastic wastes

• Main Authors: Yen-Chen Yao, 姚彥丞
• Other Authors: 江康鈺
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/31706928103156695837

碩士 === 國立中央大學 === 環境工程研究所 === 105 === This research aims to evaluate the energy conversion efficiency and speciation characteristics of pyrolytic oil in catalytic pyrolysis of plastic wastes by using fluidized bed reactor with controlled at pyrolysis temperature 560~580℃ and 5~15% mineral catalyst (zeolite) addition. The plastic wastes used in this research were including Polylactic Acid, (PLA), Polyethyleneterephthalate (PET), and Polystyrene (PS), respectively. Blending ratio of PET or PS was controlled at 0%~30%. Synergistic effect and kinetics characteristics in co-pyrolysis of plastic wastes were also discussed. The analysis results of activation energy of tested plastic wastes indicated that PLA got the higher activation energy (258 kJ/mole) than that of PS (170 kJ/mole). Meanwhile, activation energy of mixed plastic wastes was decreased with an increase in PET and/or PS addition. It implied that the synergistic effect was occurred at different PET or PS blending and could promote PLA cracking into small molecular. According to the results of pyrolytic oil yield from PLA, the pyroltic oil production was approximately 14.5% and oil yield was increased to 21% as PET blending ratio was increasing to 30%. Based on the yield results of light and heavy fraction of pyrolytic oil produced from mixed plastic wastes, in the case of PET or PS blending, yield of light oil fraction was increased from 5.85% to 10.95% and 8.4%, respectively. On the other hand, tested catalyst could slightly increase pyrolytic oil yield from 21% to 22.62% with catalyst addition ratio increasing from 5% to 10%. However, heavy fraction of pyrolytic oil was significantly decreased with an increase in catalyst addition. Based on the results of characteristics of pyrolytic oil, the O/C ratio of pyrolytic oil was decreased from 1.0 to 0.5 with an increased in PET or PS addition. It implied that pyrolytic oil produced from blended PET or PS could prevent the aging of pyrolytic oil during its storage or transportation. According to the analysis results of functional group in pyrolytic oil, light fraction of pyrolytic oil containing oxygenated functional group will convert to that of oil containing branched and/or aromatic functional group. The nitrogen and sulfur contents of pyrolytic oil were also decreased with PET or PS blending and tested catalyst addition. It could reduce significantly the air pollutants emission when it applied to alternative fuel application.