Abstract
A two-step aqueous alkaline hydrolysis was carried out on different types of real PET plastic waste under mild conditions.
Highlights
Polyethylene terephthalate (PET) exists both as a semi-crystalline and an amorphous thermoplastic polyester mainly used in textiles and packaging due to its good physicochemical properties such as lightweight, good heat resistance and dimensional stability, resistance towards chemicals, among others.[1]
The overall life cycle assessment (LCA) shows that, relying on with industrial optimization, the hydrolysis process presented in this study has a potential benefit in terms of carbon emission compared to incineration, which is still the reference scenario for many complex PET streams such as PET trays and films containing PET
We have shown that the diffusion model describes the kinetic behavior of PET alkaline hydrolysis adequately
Summary
Polyethylene terephthalate (PET) exists both as a semi-crystalline and an amorphous thermoplastic polyester mainly used in textiles and packaging due to its good physicochemical properties such as lightweight, good heat resistance and dimensional stability, resistance towards chemicals, among others.[1] PET is best known as a monolayer “clear plastic” widely used. PET is one of the most recycled materials; in 2017 more than 57% of PET bottles were recycled in Europe.[3] Especially transparent PET bottles have high collecting and recycling rates over Europe, but recycling rates for opaque PET bottles, PET trays and films are significantly lower due to the broad range of colours, additives, multilayer structure, labels and other complexities.[4] they are mainly disposed of in landfill or incineration because it is not possible to obtain a secondary raw material with a high value by using the typical mechanical recycling processes.[5,6]. PET can be recycled or recovered via four pathways, namely primary recycling, secondary recycling, chemical recycling and incineration.[7] Primary recycling focuses on mainly uncontami-
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