Pyrolysis kinetics and reaction mechanism of expandable polystyrene by multiple kinetics methods

Zhang, Wenlong; Zhang, Juan; Ding, Yanming; He, Qiye; Lu, Kaihua; Chen, Haiyan

doi:10.1016/j.jclepro.2020.125042

Cited by 72 publications

(32 citation statements)

References 59 publications

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“…However, the FWO method is slightly inaccurate compared with other model-free methods [ 31 ]. Furthermore, the E a calculated from the FWO method is larger than that calculated by KAS and Starink [ 13 ]. In this study, the E a is also a little larger than that of DAEM, Starink and Tang methods.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, because of the large amount of XPS waste, the issue of disposal of the waste is becoming increasingly urgent [ 12 ]. However, improper processing of waste could lead to a series of problems, such as waste of resources [ 13 ], environmental contamination [ 14 ], fire hazard [ 15 ] and so on. Among the commonly-used methods of solid waste treatment, pyrolysis is expected to be a meaningful energy conversion method that can convert solid waste into fuel [ 16 ] and recover useful chemicals [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Pyrolysis Kinetic Properties of Thermal Insulation Waste Extruded Polystyrene by Multiple Thermal Analysis Methods

Zhang

et al. 2020

Materials

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Extruded polystyrene (XPS) is a thermal insulation material extensively applied in building systems. It has attracted much attention because of outstanding thermal insulation performance, obvious flammability shortcoming and potential energy utilization. To establish the reaction mechanism of XPS’s pyrolysis, thermogravimetric experiments were performed at different heating rates in nitrogen, and multiple methods were employed to analyze the major kinetics of pyrolysis. More accurate kinetic parameters of XPS were estimated by four common model-free methods. Then, three model-fitting methods (including the Coats-Redfern, the iterative procedure and masterplots method) were used to establish the kinetic model. Since the kinetic models established by the above three model-fitting methods were not completely consistent based on different approximations, considering the effect of different approximates on the model, the reaction mechanism was further established by comparing the conversion rate based on the model-fitting methods corresponding to the possible reaction mechanisms. Finally, the accuracy of the above model-fitting methods and Particle Swarm Optimization (PSO) algorithm were compared. Results showed that the reaction function g(α) = (1 − α)−1 − 1 might be the most suitable to characterize the pyrolysis of XPS. The conversion rate calculated by masterplots and PSO methods could provide the best agreement with the experimental data.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pyrolysis Kinetic Properties of Thermal Insulation Waste Extruded Polystyrene by Multiple Thermal Analysis Methods

Zhang

et al. 2020

Materials

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“…On the other hand, different ranges and values of the WEP E a have been reported, such as values of 125-147 KJ/mol with an average of 138.39 KJ/mol [32], 100-107 KJ/mol with an average of 104.31 KJ/mol and 126.52 KJ/mol [Jun et al, 2006], 46-170 KJ/mol with an average of 89.62 KJ/mol [17] and 60-100 KJ/mol [Azimi et al, 2008], these variations are due to the experimental conditions, that is, if the work was done with a nitrogen or air ow and the gas ow, the temperature and the heating rate, as well as the kinetic model with which the values were obtained of the E a . However, studies show that the degradation reaction of WEP in a nitrogen or air environment is carried out in a single reaction step [14,32].…”

Section: Dsc Y Tgmentioning

confidence: 99%

A Recycling Alternative for Expanded Polystyrene Residues Using Natural Esters

García-Barrera

Ortega-Solís

Soriano-Giles

et al. 2022

Preprint

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The objective of this research is to provide a new recycling method for one of the most consumed plastics today, since it is used for the manufacture of a wide variety of industrial products, which leads to an environmental problem caused by incorrect handling and final disposal.The dissolution of expanded polystyrene waste (WEP) was evaluated by using natural esters for its post treatment and recovery. The use of omega-3 as a natural solvent creates an opportunity to take advantage of natural biomass, since it can be obtained from the residues from the fishing activity, this being an economic advantage for obtaining raw material and also friendly with the environment.For the development of this research, expanded polystyrene containers were used, as well as omega-3 and glyceryl tributyrate as natural solvents and ethyl butyrate as synthetic solvent, methanol and isopropanol for recovery and cleaning of the polystyrene. The characterization of the recovered material was carried out with thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and infrared spectroscopy (FTIR) techniques. The experimental data obtained indicated that the use of these esters is a good alternative for the recycling of expanded polystyrene.

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“…Mostly, a large number of solid wastes can be disposed of by traditional methods, such as landfilling [ 6 ] and incineration. [ 7 ] However, with the increasing attention to environmental protection and energy utilization, more and more researchers pay attention to the impact of solid waste treatment on the environment. [ 8 ] Some researchers noted that landfilling would result in environmental issues as non‐degradable solid waste could last in the soil a long time.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the kinetic parameters of chlorinated polyvinyl chloride waste pyrolysis by particle swarm optimization

Zhang

Huang

et al. 2021

Vinyl Additive Technology

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Chlorinated polyvinyl chloride (CPVC) is a widely‐used material in various fields with excellent properties. However, CPVC waste is one of the most intractable solids to dispose of. With the development of pyrolysis technology, some advantages have been exhibited, for example, it is flexible to convert solid waste into clean products by pyrolysis, which can be used as energy. Therefore, pyrolysis is considered as an effective method to dispose of solid waste. Especially, kinetic parameters are significant for pyrolysis, which contributes to reactor design and waste management. To better apply the kinetic parameters of CPVC to dispose of waste, thermogravimetric experiments were conducted to obtain the kinetic parameters and establish the reaction mechanism. The Tang, distributed activation energy model, and Advanced Vyazovkin methods were used to calculate the activation energy, and the reaction order was obtained by the Coats‐Redfern method. The results showed that the reaction consisted of two stages, and the average activation energy of the corresponding stage was 153.27 and 290.55 kJ/mol, respectively. However, the abovementioned parameters by traditional methods were not enough to characterize the whole pyrolysis behaviors, then the obtained kinetic parameters were further optimized and extra parameters were computed by the Particle Swarm Optimization algorithm.

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Pyrolysis kinetics and reaction mechanism of expandable polystyrene by multiple kinetics methods

Cited by 72 publications

References 59 publications

Pyrolysis Kinetic Properties of Thermal Insulation Waste Extruded Polystyrene by Multiple Thermal Analysis Methods

Pyrolysis Kinetic Properties of Thermal Insulation Waste Extruded Polystyrene by Multiple Thermal Analysis Methods

A Recycling Alternative for Expanded Polystyrene Residues Using Natural Esters

Estimation of the kinetic parameters of chlorinated polyvinyl chloride waste pyrolysis by particle swarm optimization

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