Analysis of recycled PET bottles products by pyrolysis-gas chromatography

Dimitrov, Nino; Krehula, Ljerka Kratofil; Siročić, Anita Ptiček; Hrnjak-Murgić, Zlata

doi:10.1016/j.polymdegradstab.2013.02.013

Cited by 153 publications

(85 citation statements)

References 24 publications

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“…However, there were no obvious peaks on the H 2 O MS curves for PET plastic. Therefore, the bio-oil generated during the pyrolysis of PET plastic had a negligible amount of H 2 O and thus was highly viscous as reported in the literature (Dimitrov et al, 2013;Miskolczi and Nagy, 2012).…”

Section: Evolved Gas Profile Of Individual Msw Components Pyrolysismentioning

confidence: 67%

Thermogravimetric and calorimetric characteristics during co-pyrolysis of municipal solid waste components

2016

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The thermogravimetric and calorimetric characteristics during pyrolysis of wood, paper, textile and polyethylene terephthalate (PET) plastic in municipal solid wastes (MSW), and co-pyrolysis of biomass-derived and plastic components with and without torrefaction were investigated. The active pyrolysis of the PET plastic occurred at a much higher temperature range between 360°C and 480°C than 220-380°C for the biomass derived components. The plastic pyrolyzed at a heating rate of 10°C/min had the highest maximum weight loss rate of 18.5wt%/min occurred at 420°C, followed by 10.8wt%/min at 340°C for both paper and textile, and 9.9wt%/min at 360°C for wood. At the end of the active pyrolysis stage, the final mass of paper, wood, textile and PET was 28.77%, 26.78%, 21.62% and 18.31%, respectively. During pyrolysis of individual MSW components at 500°C, the wood required the least amount of heat at 665.2J/g, compared to 2483.2J/g for textile, 2059.4J/g for paper and 2256.1J/g for PET plastic. The PET plastic had much higher activation energy of 181.86kJ/mol, compared to 41.47kJ/mol for wood, 50.01kJ/mol for paper and 36.65kJ/mol for textile during pyrolysis at a heating rate of 10°C/min. H2O and H2 peaks were observed on the MS curves for the pyrolysis of three biomass-derived materials but there was no obvious H2O and H2 peaks on the MS curves of PET plastic. There was a significant interaction between biomass and PET plastic during co-pyrolysis if the biomass fraction was dominant. The amount of heat required for the co-pyrolysis of the biomass and plastic mixture increased with the increase of plastic mass fraction in the mixture. Torrefaction at a proper temperature and time could improve the grindability of PET plastic. The increase of torrefaction temperature and time did not affect the temperature where the maximum pyrolytic rates occurred for both biomass and plastic but decreased the maximum pyrolysis rate of biomass and increased the maximum pyrolysis rate of PET plastic. The amount of heat for the pyrolysis of biomass and PET mixture co-torrefied at 280°C for 30min was 4365J/g at 500°C, compared to 1138J/g for the pyrolysis of raw 50% wood and 50% PET mixture at the same condition.

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Section: Evolved Gas Profile Of Individual Msw Components Pyrolysismentioning

confidence: 67%

Thermogravimetric and calorimetric characteristics during co-pyrolysis of municipal solid waste components

2016

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“…The thermograms show that significant weight loss between 200 o C and 450 o C, which is attributed to PET polymer degradation process such as a random scission of ester links in the main chain resulting with the formation of different oligomers [22,23]. Further, the maximum decomposition rate of the residual PET fiber will be shifted to lower temperature with the increase of reaction time.…”

Section: Evolution Of the Glycolysis Reaction And Analysis Of Glycolymentioning

confidence: 99%

Kinetics of poly(ethylene terephthalate) fiber glycolysis in ethylene glycol

Chen

Zhou

et al. 2015

Fibers Polym

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The glycolysis of poly(ethylene terephthalate) (PET) fiber is carried out using excess ethylene glycol (EG) in the presence of Zn/Al mixed oxides. The effects of the weight ratio of EG to PET, the weight ratio of catalyst to PET, reaction temperature and reaction time on the yield of bis(hydroxyethyl terephthalate)(BHET) are investigated. The conversion of PET and yield of bis(2-hydroxyethyl terephthalate) (BHET) reach about 92.6 % and 82 % under the optimal experimental conditions. The properties of the glycolysis products have been characterized by scanning electron microscopy (SEM), infrared spectroscopy analysis (IR), differential scanning calorimeter (DSC), thermogravimetric analysis (TG) and high performance liquid chromatography (HPLC). An evolution of the glycolysis reaction is proposed. In addition, the kinetic of PET fiber is investigated. The results indicate that this glycolysis process is a first-order kinetic reaction and the activation energy is 79.3 kJ/mol, which is lower compared to the same reaction process using PET flake from the soft drink bottle.

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“…However, Dimitrov et al [57] showed that it is possible to pyrolyze PET together with other type of polymers. When pyrolyzed individually, PET can be converted to different products, depending on the medium.…”

Section: Liquid From Pyrolysis Of Single Type Of Plasticmentioning

confidence: 99%