Abstract
Recently, a pyrolysis process has been adapted as an emerging technology to convert metalized food packaging plastics waste (MFPWs) into energy products with a high economic benefit. In order to upscale this technology, the knowledge of the pyrolysis kinetic of MFPWs is needed and studying these parameters using free methods is not sufficient to describe the last stages of pyrolysis. For a better understanding of MFPWs pyrolysis kinetics, independent parallel reactions (IPR) kinetic model and its modification model (MIPR) were used in the present research to describe the kinetic parameters of MFPWs pyrolysis at different heating rates (5–30 °C min−1). The IPR and MIPR models were built according to thermogravimetric (TG)-Fourier-transform infrared spectroscopy (FTIR)-gas chromatography−mass spectrometry (GC-MS) results of three different types of MFPWs (coffee, chips, and chocolate) and their mixture. The accuracy of the developed kinetic models was evaluated by comparing the conformity of the DTG experimental results to the data calculated using IPR and MIPR models. The results showed that the dependence of the pre-exponential factor on the heating rate (as in the case of MIPR model) led to better conformity results with high predictability of kinetic parameters with an average deviation of 2.35% (with an improvement of 73%, when compared to the IPR model). Additionally, the values of activation energy and pre-exponential factor were calculated using the MIPR model and estimated at 294 kJ mol−1 and 5.77 × 1017 kJ mol−1 (for the mixed MFPW sample), respectively. Finally, GC-MS results illustrated that pentane (13.8%) and 2,4-dimethyl-1-heptene isopropylcyclobutane (44.31%) represent the main compounds in the released volatile products at the maximum decomposition temperature.
Highlights
Metalized food packaging plastic waste (MFPWs) is classified as a plastic waste with a very complex composition [1]
In order to ensure diversity and to increase the accuracy of results obtained from the developed pyrolysis kinetic model, the experiments were performed on three different types of metalized food packaging plastic waste (MFPWs): coffee, chips, and chocolate and their mixture
All pyrolysis characteristics of volatile matters released from the mixed metalized food packaging plastics waste (MFPWs) sample were studied, and the pyrolysis kinetics was modeled using the independent parallel reactions (IPR) kinetic model and its modification (MIPR)
Summary
Metalized food packaging plastic waste (MFPWs) is classified as a plastic waste with a very complex composition [1]. Polymers 2020, 12, 1763 layers and to recover them in the shape of secondary raw materials using the traditional mechanical and chemical practices such as grinding and dissolution treatment [3,7,8] These studies demonstrated clearly that the separation of MFPWs layers is always a great challenge as the surface area of the thinner materials is higher in comparison to the bulk material and it is exposed more to the atmospheric oxygen [9], MFPWs mostly end in landfilling, followed by incineration with other municipal solid waste, and the rate of recycling is almost negligible, being around~20% [10,11]. The modified IPR model was used to eliminate the aforementioned drawbacks of previous investigations as far as possible and to decrease the variation
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