TY - JOUR
T1 - Thermal decomposition of individual and mixed plastics in the presence of CaO or Ca(OH)2
AU - Kumagai, Shogo
AU - Hasegawa, Itaru
AU - Grause, Guido
AU - Kameda, Tomohito
AU - Yoshioka, Toshiaki
N1 - Funding Information:
This work was partially supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Grant-in-Aid for Scientific Research (A), 25241022, and by the Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for JSPS Fellows, 24-4996.
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/5/1
Y1 - 2015/5/1
N2 - Abstract Individual and mixed plastics consisting of polyethylene (PE), polypropylene (PP), polystyrene (PS), and poly(ethylene terephthalate) (PET) were decomposed at 600 °C in the presence and absence of either calcium oxide (CaO) or calcium hydroxide (Ca(OH)2) under a steam atmosphere. In the presence of CaO, steam cracking was enhanced, increasing gas and liquid yields and decreasing the wax content derived from PE and PP. The production of sublimating substances from PET was also reduced. However, the presence of CaO and steam had a negative influence on PS degradation, reducing the oil yield. In addition, synergistic effects were observed in plastic mixtures. PET enhanced gasification, PS and PET reduced wax production from PE and PP, and mixing all four plastics enhanced oil production in the presence of CaO and steam. Both CaO and Ca(OH)2 enhanced the total gas and oil yield of mixed plastics, achieving a maximum oil yield of 52.2 wt% in the presence of steam. Furthermore, solids were almost completely decomposed at 700 °C, with only 0.2 wt% of residue remaining.
AB - Abstract Individual and mixed plastics consisting of polyethylene (PE), polypropylene (PP), polystyrene (PS), and poly(ethylene terephthalate) (PET) were decomposed at 600 °C in the presence and absence of either calcium oxide (CaO) or calcium hydroxide (Ca(OH)2) under a steam atmosphere. In the presence of CaO, steam cracking was enhanced, increasing gas and liquid yields and decreasing the wax content derived from PE and PP. The production of sublimating substances from PET was also reduced. However, the presence of CaO and steam had a negative influence on PS degradation, reducing the oil yield. In addition, synergistic effects were observed in plastic mixtures. PET enhanced gasification, PS and PET reduced wax production from PE and PP, and mixing all four plastics enhanced oil production in the presence of CaO and steam. Both CaO and Ca(OH)2 enhanced the total gas and oil yield of mixed plastics, achieving a maximum oil yield of 52.2 wt% in the presence of steam. Furthermore, solids were almost completely decomposed at 700 °C, with only 0.2 wt% of residue remaining.
KW - Calcium catalyst
KW - Feedstock recycling
KW - Fixed-bed reactor
KW - Pyrolysis
KW - Waste plastics
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U2 - 10.1016/j.jaap.2015.04.004
DO - 10.1016/j.jaap.2015.04.004
M3 - Article
AN - SCOPUS:84930756483
SN - 0165-2370
VL - 113
SP - 584
EP - 590
JO - Journal of Analytical and Applied Pyrolysis
JF - Journal of Analytical and Applied Pyrolysis
M1 - 3464
ER -