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Multilayer plastic film chemical recycling via sequential hydrothermal liquefaction
Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review
Dokumenter
- 1-s2.0-S0921344923002033-main
Forlagets udgivne version, 2,18 MB, PDF-dokument
DOI
- https://doi.org/10.1016/j.resconrec.2023.107067
Forlagets udgivne version
- Edoardo Tito, Polytechnic University of Turin ,
- Juliano Souza dos Passos
- Samir Bensaid, Polytechnic University of Turin ,
- Raffaele Pirone, Polytechnic University of Turin ,
- Patrick Biller
Multi-material layered plastic films are used in the food packaging industry due to their excellent properties; however they cannot be mechanically recycled. In this study, a two-stage hydrothermal liquefaction (HTL) process is proposed and tested for chemical recycling of a two-layer film made of LLDPE-PET. Experimental results showed that after a first subcritical stage at 325 °C, 94% of terephthalic acid (TPA) is recovered from the PET fraction as a solid and 47% of ethylene glycol in the aqueous phase. The unconverted PE was then used as feedstock for a subsequent supercritical HTL stage at 450 °C for 90 min, achieving mass yields of 47% and 29% in a naphtha-gasoline oil and in an alkane-rich gas, respectively. In conclusion, this work proved that a sequential HTL procedure can be used for chemical recycling of multilayer plastics, allowing the recovery of PET monomers to be recycled back to the PET industry and a paraffinic oil and hydrocarbon-rich gas phase that could be used as feedstock for steam cracking to produce virgin materials.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | 107067 |
| Tidsskrift | Resources, Conservation and Recycling |
| Vol/bind | 197 |
| ISSN | 0921-3449 |
| DOI | |
| Status | Udgivet - okt. 2023 |
Bibliografisk note
Funding Information:
This research was funded by the Independent Research Foundation Denmark project CatPol: Catalytic depolymerization of synthetic polymers , grant number 1032–00263B
Publisher Copyright:
© 2023
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