Issue
Korean Journal of Chemical Engineering,
Vol.25, No.5, 1047-1053, 2008
Thermogravimetric characteristics and kinetic study of biomass co-pyrolysis with plastics
The pyrolysis of pure biomass, high density polyethylene (HDPE), polypropylene (PP) and polyethylene terephthalate (PET), plastic mixtures [HDPE+PP+PET (1 : 1 : 1)], and biomass/plastic mixture (9 : 1, 3 : 1, 1 : 1, 1 : 3 and 1 : 9) were investigated by using a thermogravimetric analyzer under a heating rate at 10 oC/min from room temperature to 800 ℃. Paper was selected as the biomass sample. Results obtained from this comprehensive investigation indicated that biomass was decomposed mainly in the temperature range of 290-420 ℃, whereas thermal degradation temperature of plastic mixture is 390-550 ℃. The percentage weight loss difference (W) between experimental and theoretical ones was calculated, which reached a significantly high value of (-)15 to (-)50% at around 450 ℃ in various blend materials. These thermogravimetric results indicate the presence of significant interaction and synergistic effect between biomass and plastic mixtures during their co-pyrolysis at the high temperature region. With increase in the amount of plastic mixture in blend material, the char production has diminished at final pyrolysis temperature range. Additionally, a kinetic analysis was performed to fit with TGA data, the entire pyrolysis processes being considered as one or two consecutive first order reactions.
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