Mixed polyester recycling can enable a circular plastic economy with environmental benefits

DesVeaux, Jason S.; Uekert, Taylor; Curley, Julia B.; Choi, Hoon; Liang, Yuanzhe; Singh, Avantika; Mante, Ofei D.; Beckham, Gregg T.; Jacobsen, Alan J.; Knauer, Katrina M.

doi:10.1016/j.oneear.2024.11.007

Mixed polyester recycling can enable a circular plastic economy with environmental benefits

Journal Article · Thu Dec 19 19:00:00 EST 2024 · One Earth

DOI:https://doi.org/10.1016/j.oneear.2024.11.007· OSTI ID:2491422

DesVeaux, Jason S. ^[1]; Uekert, Taylor ^[1]; Curley, Julia B. ^[1]; ^[1]; Liang, Yuanzhe ^[1]; Singh, Avantika ^[1]; Mante, Ofei D. ^[2]; ^[1]; Jacobsen, Alan J. ^[2]; ^[1]

National Renewable Energy Laboratory (NREL), Golden, CO (United States); BOTTLE Consortium, Golden, CO (United States)
Amazon, Seattle, WA (United States)

The mixed and varied nature of fossil-based and bio-based plastic waste requires complex and costly separations to enable compatibility with recycling technologies. A circular plastic economy based on mixed polyesters through cleaving ester bonds to produce monomers, while re-utilizing bio-based monomers to produce high-quality sustainable plastics, charts an exciting solution. However, the feasibility of such a circular economy solution remains underexplored. Here, in this study, we conducted a techno-economic analysis and life-cycle assessment of three polyester depolymerization recycling processes-methanolysis, glycolysis, and acid hydrolysis-for a mixed feedstock (polyethylene terephthalate [PET], polylactic acid [PLA], and polybutylene adipate terephthalate [PBAT]). Methanolysis outperforms glycolysis and hydrolysis economically and environmentally due to more efficient downstream separations, generating products with a 31% decrease in selling price and 21%-46% reduction in acidification, carcinogenic toxicity, fossil-fuel depletion, global warming potential, particulate formation, and smog formation compared to conventional polyester manufacturing. This study highlights the viability of a circular plastic economy for mixed polyesters via a single chemical recycling process.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 2491422

Report Number(s):: NREL/JA--5100-87422

Journal Information:: One Earth, Journal Name: One Earth Journal Issue: 12 Vol. 7; ISSN 2590-3322

Publisher:: Cell PressCopyright Statement

Country of Publication:: United States

Language:: English

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09 BIOMASS FUELS
36 MATERIALS SCIENCE
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bioplastic
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circular economy
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life-cycle assessment
methanolysis
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Mixed polyester recycling can enable a circular plastic economy with environmental benefits

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