Kinetic study of polyethylene terephthalate (PET) pyrolysis in a spouted bed reactor

Niksiar, Arezou; Faramarzi, Amir Hasan; Sohrabi, Morteza

doi:10.1016/j.jaap.2015.03.002

Cited by 32 publications

(15 citation statements)

References 22 publications

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“…9,14 Pyrolysis of waste synthetic polymers is a win−win option for plastics recycling and waste volume reduction. 2 Therefore, many lab-scale studies have analyzed the feasibility of pyrolysis of PET, 13,15,16 polyethylene, 17,18 polypropylene, 19,20 and other plastics. 21−23 Moreover, Pilot-scale facilities for plastics pyrolysis are developed worldwide.…”

Section: ■ Introductionmentioning

confidence: 99%

Conversion of Polyethylene Terephthalate Based Waste Carpet to Benzene-Rich Oils through Thermal, Catalytic, and Catalytic Steam Pyrolysis

Valla

Parnas

et al. 2016

ACS Sustainable Chem. Eng.

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Management of carpet wastes has become a substantial environmental issue in the United States. Specifically, reutilization of polyethylene terephthalate (PET) from waste carpet is increasingly problematic because of the steadily growing market share of PET-based carpets and the very low value of their wastes. In this work, we investigate pyrolysis as an option for repurposing PET carpet wastes. In particular, slow and fast, thermal and catalytic pyrolyses, with and without the co-feeding of steam, are investigated in terms of their selectivity to monoaromatic products. It is seen that higher temperatures increase the conversion of PET to aromatic hydrocarbons. Pyrolysis at slow heating rates is very selective to benzene production. Thermal pyrolysis of waste carpet produces significant amounts of benzoic acid and acetylbenzoic acid as liquid products, whereas catalytic pyrolysis enhances the decarboxylation of these acids, producing aromatic hydrocarbons. ZSM-5 and CaO are effective catalysts for enhancing deoxygenation reactions during catalytic pyrolysis of waste carpet but with significantly different selectivities. Catalytic steam pyrolysis is seen to accomplish the highest selectivity to benzene among all the pyrolysis options studied, due to the enhancement of hydrolysis reactions. The essentially pure benzene organic liquid product from steam pyrolysis of carpet-originated PET presents a unique opportunity for the reutilization of this unsustainable waste.

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Section: ■ Introductionmentioning

confidence: 99%

Conversion of Polyethylene Terephthalate Based Waste Carpet to Benzene-Rich Oils through Thermal, Catalytic, and Catalytic Steam Pyrolysis

Valla

Parnas

et al. 2016

ACS Sustainable Chem. Eng.

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“…However, an accurate definition of the process for its further optimisation would require the implementation of the exact kinetic expression that define the precise reaction rates and conversions (Moliner et al 2017b(Moliner et al , 2017c.The extension of the kinetic law to a greater scale should take into account potential heat and mass transfer limitations. In this sense, spouted bed reactors present high isothermicity and excellent heat transfer between the phases and ensure the validity of the application of the kinetic results (Niksiar et al, 2015).…”

Section: Assessment Of the Kinetic Triplet To Model The Inert And Oximentioning

confidence: 78%

Thermal kinetics for the energy valorisation of polylactide/sisal biocomposites

et al. 2018

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The thermal stability and decomposition kinetics of PLA/sisal biocomposites was discussed to evaluate the suitability of their use in energy recovery processes such as pyrolysis and combustion. The influence of the addition of sisal up to 30%wt, the presence of coupling agent, and the atmosphere of operation, i.e. inert or oxidative was discussed by means of multi-rate linear nonisothermal thermogravimetric experiments. All biocomposites showed a mean high heating value of 15 MJ/kg indicating their suitability for energy recovery processes. The thermal requirements of PLA/sisal decomposition were assessed in terms of onset decomposition temperature and apparent activation energy. A minimum of 240 °C and 174 kJ•mol-1 in inert environment and 225 °C and 190 kJ•mol-1 in oxidative environment ensured the feasibility of the reactions regardless the composition of the PLA/sisal biocomposites. The atmosphere of work lead to a greater amount of residue in case of pyrolysis reactions that would need further treatment whereas an oxidative atmosphere resulted in nearly zero final waste stream. The similar kinetics obtained for all samples regardless the amount of sisal or use of coupling agent eases the operability of energy facilities aimed of turning these biowastes into new fuels.

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“…The oligomer products were discussed [ 201 ]. The kinetic of PET with pyrolysis in a spouted bed reactor was studied by Niksiar et al The temperature range of kinetic pyrolysis PET was 450–560 °C using a different type of particle size (0.1–1.0 mm and 1.0–3.0 mm) with the activation energy of 276.8 and 264.3 kJ/mol [ 203 ]. The reaction kinetic of PET by Arrhenius law also was studied by Brems et al, the value of activation energy is 237 kJ/mol while the pre-exponential factor (A) up to 10 16 s −1 at a heating rate (β) = 3 °C·min −1 to 2.5 × 10 16 s −1 at β > 100 °C min -1 [ 194 ].…”

Section: Kinetic and Modeling Analysis Of Chemical Recycling Petmentioning

confidence: 99%

Strategic Possibility Routes of Recycled PET

2021

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The polyethylene terephthalate (PET) application has many challenges and potential due to its sustainability. The conventional PET degradation was developed for several technologies to get higher yield products of ethylene glycol, bis(2-hydroxyethyl terephthalate) and terephthalic acid. The chemical recycling of PET is reviewed, such as pyrolysis, hydrolysis, methanolysis, glycolysis, ionic-liquid, phase-transfer catalysis and combination of glycolysis–hydrolysis, glycolysis–methanolysis and methanolysis–hydrolysis. Furthermore, the reaction kinetics and reaction conditions were investigated both theoretically and experimentally. The recycling of PET is to solve environmental problems and find another source of raw material for petrochemical products and energy.

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Kinetic study of polyethylene terephthalate (PET) pyrolysis in a spouted bed reactor

Cited by 32 publications

References 22 publications

Conversion of Polyethylene Terephthalate Based Waste Carpet to Benzene-Rich Oils through Thermal, Catalytic, and Catalytic Steam Pyrolysis

Conversion of Polyethylene Terephthalate Based Waste Carpet to Benzene-Rich Oils through Thermal, Catalytic, and Catalytic Steam Pyrolysis

Thermal kinetics for the energy valorisation of polylactide/sisal biocomposites

Strategic Possibility Routes of Recycled PET

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