PET and aluminum recycling from multilayer food packaging using supercritical ethanol

Fávaro, Sílvia Luciana; Freitas, Adonilson R.; Ganzerli, Thiago Amaral; Pereira, Antonio G.B.; Cardozo, Adriano Luciano; Baron, Orlando; Muniz, Edvani C.; Girotto, Emerson M.; Radovanovic, Eduardo

doi:10.1016/j.supflu.2012.12.015

Cited by 67 publications

(39 citation statements)

References 32 publications

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“…Surveying separation by spectral signs, Gondal and Siddiqui (2007) found that laser-induced breakdown spectroscopy is suitable for detecting PE, PP and ABS molecules. Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy are widely used for detecting the purity of the separated final polymer waste, after the measurement of the spectral signals for pure substances (Fávaro et al, 2013;Giancola et al, 2012;Ramesh et al, 2007;Serranti et al, 2011;Vajna et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Alternative polymer separation technology by centrifugal force in a melted state

Dobrovszky

Ronkay

2014

Waste Management

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Abstract:In order to upgrade polymer waste during recycling, separation should take place at high purity. The present research was aimed to develop a novel, alternative separation opportunity, where the polymer fractions were separated by centrifugal force in melted state. The efficiency of the constructed separation equipment was verified by two immiscible plastics (polyethylene terephthalate, PET; low density polyethylene, LDPE), which have a high difference of density, and of which large quantities can also be found in the municipal solid waste. The results show that the developed equipment is suitable not only for separating dry blended mixtures of PET/LDPE into pure components again, but also for separating prefabricated polymer blends. By this process it becomes possible to recover pure polymer substances from multi-component products during the recycling process. The adequacy of results was verified by differential scanning calorimetry (DSC) measurement as well as optical microscopy and Raman spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Alternative polymer separation technology by centrifugal force in a melted state

Dobrovszky

Ronkay

2014

Waste Management

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“…This method was developed to avoid the drawbacks of the methods like glycolysis (heterogeneous reaction products) or acidic and alkaline hydrolysis (pollution problems) to provide a renewable and eco-friendly degrading agent for polymers [135]. The general reaction scheme is depicted in Figure 3a.…”

Section: Alcoholysismentioning

confidence: 99%

“…Generally, PET is de-polymerized with an excess of an alcohol to yield corresponding esters of terephthalic acid and ethylene glycol [136]. Fávaro et al [135] completely de-polymerized PET with excess supercritical ethanol at 255°C and 116 bar for 30 to 120 minutes. They obtained diethylene terephthalate with 80% yield (Table 2) as monomer for PET synthesis.…”

Section: Alcoholysismentioning

confidence: 99%

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

Geyer¹,

Lorenz²,

Kandelbauer³

2016

Express Polym. Lett.

204

120

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Abstract.Recycling of poly(ethylene terephthalate) (PET) is of crucial importance, since worldwide amounts of PETwaste increase rapidly due to its widespread applications. Hence, several methods have been developed, like energetic, material, thermo-mechanical and chemical recycling of PET. Most frequently, PET-waste is incinerated for energy recovery, used as additive in concrete composites or glycolysed to yield mixtures of monomers and undefined oligomers. While energetic and thermo-mechanical recycling entail downcycling of the material, chemical recycling requires considerable amounts of chemicals and demanding processing steps entailing toxic and ecological issues. This review provides a thorough survey of PET-recycling including energetic, material, thermo-mechanical and chemical methods. It focuses on chemical methods describing important reaction parameters and yields of obtained reaction products. While most methods yield monomers, only a few yield undefined low molecular weight oligomers for impaired applications (dispersants or plasticizers). Further, the present work presents an alternative chemical recycling method of PET in comparison to existing chemical methods.

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“…density and visual aspects. Multilayer films are composed of polymers incompatible for extrusion recycling [6] [7] [8] [9]. Film containing poly (ethylene terephthalate) (PET) is an interesting example.…”

Section: Introductionmentioning

confidence: 99%

Outstanding Impact Resistance of Post-Consumer HDPE/Multilayer Packaging Composites

Fávaro¹,

Pereira²,

Fernandes³

et al. 2017

MSA

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New recycling alternative for multilayer films was successfully presented. Food packaging formed from different materials is difficult to recycle. The use of aluminum, glass, paper, paints, varnishes, and other materials in the rolling processes from plastic packaging is intended to optimize the efficiency of packaging. Nevertheless, these materials prevent the recycling of packaging because they become contaminants to the recycling process. Food multilayered packaging containing poly (ethylene terephthalate) PET, poly (ethylene) PE and aluminum was used as filler in the preparation of composites with post-consumer high density polyethylene matrix. Composites containing up to 50 wt% of filler were feasible to prepare, allowing the obtention of a material with varied mechanical and thermal properties. This feature allows the preparation of composites suitable for specific application. The addition of multilayer matter in the polyethylene matrix provided a material with excellent mechanical properties such as higher tensile impact strength (148 J/m) and elasticity (350 MPa) as compared to pure polyethylene (40 J/m and 450 MPa).

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PET and aluminum recycling from multilayer food packaging using supercritical ethanol

Cited by 67 publications

References 32 publications

Alternative polymer separation technology by centrifugal force in a melted state

Alternative polymer separation technology by centrifugal force in a melted state

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

Outstanding Impact Resistance of Post-Consumer HDPE/Multilayer Packaging Composites

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