Pyrolysis dynamics of two medical plastic wastes: Drivers, behaviors, evolved gases, reaction mechanisms, and pathways

Ding, Ziyi; Huashan, Chen; Liu, Jingyong; Cai, Haiming; Evrendilek, Fatih; Büyükada, Musa

doi:10.1016/j.jhazmat.2020.123472

Cited by 100 publications

(59 citation statements)

References 46 publications

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“…The pyrolysis of plastic waste is complicated due to numerous parallel or consecutive reactions. , The global pyrolysis reaction can be represented and split as The detailed kinetic equation derivation process was reported in various studies. , Through the mathematic separation of variables (α and T ) in the kinetic equation of the solid-state reaction, integration of both sides leads to the eq . Therefore, the pyrolysis process can be exhibited via eq : where α is the conversion degree at the actual time t ; β is the heating rate, K min –1 ; E (α) is the apparent activation energy, kJ mol –1 ; A is the pre-exponential factor, min –1 ; R represents the universal gas constant; the f (α) is the kinetic model; the P ( u ) is an exponential integration of the temperature; and u = E / RT …”

Section: Methodsmentioning

confidence: 99%

“…Equation can be calculated by approximation methods that deal with no analytical solution. , The KAS method was based on Coats–Redfern approximation and was expressed as , According to Doyle’s approximation, , the FWO method can be expressed as The E (α) values for a series of particular conversion degree α are achieved from the ln( β / T 2 ) (KAS) and lnβ (FWO) versus 1/ T . The KAS method for calculating the E (α) values can be applied when the difference between the E (α) value at each conversion degree α and the average E (α) value is lower than 30%, thus limiting its application. , In the FWO method, E (α) values depend on the heating pathway, in which the E (α) value is only a function of the heating rate. , …”

Section: Methodsmentioning

confidence: 99%

“…Microplastics have entered the food chain, which is seriously hazardous to human health . Besides, the raised concern about the public health issues including coronavirus (COVID-19), Ebola virus (EBOV), and severe acute respiratory syndrome (SARS) leads to the rapidly growing medical plastic waste such as syringes, infusion tube, and medicine bottles . Consequently, increasing attention from human society is devoted to the proper management of plastic waste.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, the CH 4 was the main gaseous product produced from copyrolysis of a tire with polyethylene and polypropylene. The pyrolyzer coupled with gas chromatography and mass spectrometry (Py-GC–MS) and TG-FTIR together analyzed the pyrolysis of plastic waste, which could obtain the information on evolution of gas products, functional groups, and hydrocarbon structure accurately. − Ding et al identified the pyrolysis characteristics of polyethylene and polypropylene via TG-FTIR and Py-GC–MS and found that the main hydrocarbons obtained from pyrolysis of polypropylene were C 4 C 24 alkenes and dialkene, whereas C 6 C 41 alkanes and C 8 C 41 1-alkenes were produced from pyrolysis of polyethylene. However, plastic waste have the characteristics of massive production, wide varieties, and complex component, and most previous studies generally pyrolyzed one or two representative components.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics, Product Evolution, and Mechanism for the Pyrolysis of Typical Plastic Waste

Zhang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

107

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This research investigates the kinetic, product evolution, mechanism of polyethylene (PE), polypropylene (PP), and a simulated mixture of plastic waste (SMP) via TGA/DSC−MS and Py-GC−MS. The pyrolysis reactions were predominantly endothermic, and the main degradation stage of PE, PP, and SMP ranged from 389.85 to 502.17 °C, from 374.91 to 495.15 °C, and from 368.30 to 496.29 °C, respectively. The kinetic results showed that polyolefin pyrolysis was identified to be the geometrical contraction models with apparent activation energies of 224.31−235.32 kJ mol −1 for PE and 199.00−207.66 kJ mol −1 for PP, respectively. The SMP pyrolysis follows the first-order reaction models, and its apparent activation energy was 185.29−199.54 kJ mol −1 . Polyolefin pyrolysis products only contain C 4 −C 35 paraffin with linear alkenes for PE and branch or cyclic alkenes for PP. The large amounts of benzene radicals in the pyrolysis of SMP tended to form aromatics. The pyrolysis behavior and product formation mechanism of the plastic waste could make available practical implications for the reactor design and parameter optimization.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetics, Product Evolution, and Mechanism for the Pyrolysis of Typical Plastic Waste

Zhang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

107

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“…Based on the test results, we modeled the progress of weight loss with changes in PMMA temperature. In this modeling, we conducted a kinetic analysis of TG data such as done in various fields [12][13][14]. This weight loss can be regarded as the total amount of pyrolysis gas released.…”

Section: Plos Onementioning

confidence: 99%

Consistent modelling of material weight loss and gas release due to pyrolysis and conducting benchmark tests of the model—A case for glovebox panel materials such as polymethyl methacrylate

et al. 2021

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It is necessary to consider how a glove box’s confinement function will be lost when evaluating the amount of radioactive material leaking from a nuclear facility during a fire. In this study, we build a model that consistently explains the weight loss of glove box materials because of heat input from a flame and accompanying generation of the pyrolysis gas. The weight loss suggests thinning of the glove box housing, and the generation of pyrolysis gas suggests the possibility of fire spreading. The target was polymethyl methacrylate (PMMA), used as the glove box panel. Thermal gravimetric tests on PMMA determined the parameters to be substituted in the Arrhenius equation for predicting the weight loss in pyrolysis. The pyrolysis process of PMMA was divided into 3 stages with activation energies of 62 kJ/mol, 250 kJ/mol, and 265 kJ/mol. Furthermore, quantifying the gas composition revealed that the composition of the pyrolysis gas released from PMMA can be approximated as 100% methyl methacrylate. This result suggests that the released amount of methyl methacrylate can be estimated by the Arrhenius equation. To investigate the validity of such estimation, a sealed vessel test was performed. In this test, we observed increase of the number of gas molecules during the pyrolysis as internal pressure change of the vessel. The number of gas molecules was similar to that estimated from the Arrhenius equation, and indicated the validity of our method. Moreover, we also performed the same tests on bisphenol-A-polycarbonate (PC) for comparison. In case of PC, the number of gas molecules obtained in the vessel test was higher than the estimated value.

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Unlocking energy potential: Investigating thermal degradation and kinetic modeling of health‐care waste polymers for enhanced pyrolysis conversion

Lourenço,

Bertuol,

Salau

2023

J of Applied Polymer Sci

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Recently, the main polymers present in the health‐care waste (HCW) of a Brazilian university hospital were identified, revealing a composition of polypropylene (85%), high‐density polyethylene (6%), polystyrene (5%), and cellulose (4%). Recognizing the potential for these materials to generate energy through pyrolysis, this study aimed to assess the thermal degradation of the HCW polymers and their respective polymer mixture using thermogravimetric analysis. Thermalgravimetric analysis encompassed three heating rates (5, 10, and 20°C min−1). The kinetic parameters of thermal degradation were estimated using the first‐order reaction model. Friedman differential isoconversional method, as well as Ozawa, Flynn–Wall–Ozawa, and Kissinger–Akahira–Sunose integral isoconversional methods, were applied to obtain the kinetic parameters, which can predict the thermal degradation kinetics of the polymers in thermal conversion process. Through statistical evaluation of the parameter estimation, it was demonstrated that the proposed methodology yielded fitted models for the experimental data on HCW. These models may be implemented in designing pyrolysis reactors that convert these polymers into energy, thereby mitigating environmental pollution.

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Pyrolysis dynamics of two medical plastic wastes: Drivers, behaviors, evolved gases, reaction mechanisms, and pathways

Abstract: Graphical abstract

Cited by 100 publications

References 46 publications

Kinetics, Product Evolution, and Mechanism for the Pyrolysis of Typical Plastic Waste

Kinetics, Product Evolution, and Mechanism for the Pyrolysis of Typical Plastic Waste

Consistent modelling of material weight loss and gas release due to pyrolysis and conducting benchmark tests of the model—A case for glovebox panel materials such as polymethyl methacrylate

Unlocking energy potential: Investigating thermal degradation and kinetic modeling of health‐care waste polymers for enhanced pyrolysis conversion

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