Plastic flexible films waste management - A state of art review.

Catalytic processing of plastic waste on the rise

/pdf/expanding-plastics-recycling-technologies-chemical-aspects-3aet431p.pdf

Expanding Plastics Recycling Technologies: Chemical Aspects, Technology Status and Challenges

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.

http://www.expresspolymlett.com/letolt.php?file=EPL-0006898&mi=c

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

Chemical recycling of PET: A stepping-stone toward sustainability

Different properties, such as barriers to gas, light, flavor and water vapor, as well as flexibility, are necessary for the production of food packages. These properties may be obtained by combining different polymers. In spite of the advantages achieved with the use of multilayer films, the recycling process of such material is a challenging task. This study presents an alternative for recycling of a quite common food packaging kind, which contains polyethylene (PE), aluminum and poly(ethylene terephthalate) (PET) as a multilayer film. The multilayer packages were delaminated with acetone. PET was depolymerized by ethanol in supercritical conditions. The diethyl terephthalate (DET) was obtained as the main product, presenting high purity and yield of 80%. Also, metallic aluminum was obtained by the PET-depolymerizing process. The optimal reaction time was 120 min. The products were characterized by FTIR, 1 H NMR and 13 C NMR spectroscopies, DSC and TGA.

PET and aluminum recycling from multilayer food packaging using supercritical ethanol

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PET and aluminum recycling from multilayer food packaging using supercritical ethanol