Study on pyrolysis characteristics and kinetics of mixed plastic waste

Yin, Fengxiang; Zhuang, Qianxiao; Chang, Tianhao; Zhang, Chao; Sun, Huadong; Sun, Qikun; Wang, Chuansheng; Li, Lin

doi:10.1007/s10163-021-01271-y

Cited by 14 publications

(9 citation statements)

References 35 publications

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“…Table presents the expressions of various solid-state reaction models and their g (α) and f (α). ,, By using the f (α) and g (α) of each model, the theoretical curves can be obtained by plotting the left-hand side of eq versus α. Meanwhile, by using the TGA data, the experimental curves are acquired by plotting the right-hand side of eq versus α.…”

Section: Methodsmentioning

confidence: 99%

Pyrolysis Characteristics and Determination of Kinetic and Thermodynamic Parameters of Raw and Torrefied Chinese Fir

Patil,

Ku,

Vasudev

2023

ACS Omega

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Torrefaction influences the structural and physicochemical properties of biomass, thus further altering its thermal degradation behavior. In this study, the pyrolysis characteristics, reaction kinetics, and thermodynamic parameters of raw and torrefied Chinese fir (CF) were investigated. The torrefaction was conducted at 220 °C (mild) and 280 °C (severe), the pyrolysis was performed from ambient temperature to 600 °C, and four different heating rates (i.e., 5, 15, 25, and 35 °C/min) were adopted. The activation energy for pyrolysis was estimated by adopting three isoconversional methods. The master-plot method was employed to analyze the reaction mechanism. Furthermore, thermodynamic parameters, i.e., the enthalpy change (ΔH), Gibbs free energy change (ΔG), and entropy change (ΔS), were calculated. The average activation energy increased with the torrefaction temperature, whose values estimated by using different methods ranged from 88.57 to 97.70, from 121.04 to 126.35, and from 167.51 to 179.74 kJ/mol for raw, mildly, and severely torrefied CF samples, respectively. A compensation effect between the activation energy and pre-exponential factor was observed for all samples. The degradation process was characterized as endothermic, involving the formation of activated complexes and requiring extra energy for torrefied samples.

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Section: Methodsmentioning

confidence: 99%

Pyrolysis Characteristics and Determination of Kinetic and Thermodynamic Parameters of Raw and Torrefied Chinese Fir

Patil,

Ku,

Vasudev

2023

ACS Omega

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“…chemical methods—changing the polymer structure of the material using chemical and thermal agents [ 231 ].…”

Section: Disposal Methods Of Poly(vinyl Chloride) From the Environmentmentioning

confidence: 99%

“…Although pyrolysis is an effective method for converting PVC waste into energy, it yields products containing significant amounts of chlorine [ 234 , 235 ]. The release of harmful substances such as polychlorinated dibenzo-p-dioxins (dioxins) and polychlorinated dibenzofurans (furans) also occurs in processes such as incineration [ 231 ]. During the thermal degradation of PVC, HCl is eliminated, leading to the formation of conjugated double bonds, and it, in turn, attacks other compounds with double bonds, leading to the production of organochlorine compounds [ 236 ].…”

Section: Disposal Methods Of Poly(vinyl Chloride) From the Environmentmentioning

confidence: 99%

“…Therefore, these processes, including storage, pose a significant risk of releasing chlorinated organic compounds, microplastics, and pollutants into soils and waters [ 237 ]. Due to the low efficiency of the recycling and the tendency to cause secondary pollution, the traditional methods of disposal of the plastic waste—incineration and landfilling—have been banned [ 231 ]. Therefore, it has become important to develop techniques to reduce Cl migration.…”

Section: Disposal Methods Of Poly(vinyl Chloride) From the Environmentmentioning

confidence: 99%

“…PVC can be recycled using various material and energy recovery methods [230]. Recycling techniques include: mechanical methods-consisting in extruding and mixing the material with primary polymers, chemical methods-changing the polymer structure of the material using chemical and thermal agents [231].…”

Section: Recycling and Utilization Of Pvcmentioning

confidence: 99%

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Risks Associated with the Presence of Polyvinyl Chloride in the Environment and Methods for Its Disposal and Utilization

Kudzin,

Piwowarska,

Festinger

et al. 2023

Materials

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Plastics have recently become an indispensable part of everyone’s daily life due to their versatility, durability, light weight, and low production costs. The increasing production and use of plastics poses great environmental problems due to their incomplete utilization, a very long period of biodegradation, and a negative impact on living organisms. Decomposing plastics lead to the formation of microplastics, which accumulate in the environment and living organisms, becoming part of the food chain. The contamination of soils and water with poly(vinyl chloride) (PVC) seriously threatens ecosystems around the world. Their durability and low weight make microplastic particles easily transported through water or air, ending up in the soil. Thus, the problem of microplastic pollution affects the entire ecosystem. Since microplastics are commonly found in both drinking and bottled water, humans are also exposed to their harmful effects. Because of existing risks associated with the PVC microplastic contamination of the ecosystem, intensive research is underway to develop methods to clean and remove it from the environment. The pollution of the environment with plastic, and especially microplastic, results in the reduction of both water and soil resources used for agricultural and utility purposes. This review provides an overview of PVC’s environmental impact and its disposal options.

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