Fast hydrolysis for chemical recycling of polyethylene terephthalate (PET)

Pereira, Patrícia; Slear, Willem; Testa, Angelo; Reasons, Kevin; Guirguis, Peter; Savage, Phillip E.; Pester, Christian W.

doi:10.1039/d4su00034j

Cited by 4 publications

(4 citation statements)

References 31 publications

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“…For example, Pester et al found that the increase of H 2 O/PET weight ratio from 2 to 8 accelerated the hydrolysis of PET upon thermal treatment at 510 °C and also increased the final TPA yield. Further increasing the weight ratio to 10, no discernible change was seen in the resulting yield of TPA, indicating that H 2 O/PET weight ratio of 8:1 was an optimum set for PET hydrolysis at such high temperatures . Typically, increasing reaction temperature accelerates the PET hydrolysis and enhances the hydrolysis degree, but excessive heat is costly and can cause damage to materials.…”

Section: Examples Of Chemical Recycling Of Step-growth Polymersmentioning

confidence: 92%

“…Typically, increasing reaction temperature accelerates the PET hydrolysis and enhances the hydrolysis degree, but excessive heat is costly and can cause damage to materials. This is also reflected by the work from the Pester group, when they increased the reaction temperature for the PET hydrolysis from 510 to 550 °C in the presence of 8-fold H 2 O, the TPA yield has significantly reduced from 90% to 25% …”

Section: Examples Of Chemical Recycling Of Step-growth Polymersmentioning

confidence: 99%

“…Further increasing the weight ratio to 10, no discernible change was seen in the resulting yield of TPA, indicating that H 2 O/ PET weight ratio of 8:1 was an optimum set for PET hydrolysis at such high temperatures. 91 Typically, increasing reaction temperature accelerates the PET hydrolysis and enhances the hydrolysis degree, but excessive heat is costly and can cause damage to materials. This is also reflected by the work from the Pester group, when they increased the reaction temperature for the PET hydrolysis from 510 to 550 °C in the presence of 8-fold H 2 O, the TPA yield has significantly reduced from 90% to 25%.…”

Section: Poly(ethylene Terephthalate)mentioning

confidence: 99%

“…This is also reflected by the work from the Pester group, when they increased the reaction temperature for the PET hydrolysis from 510 to 550 °C in the presence of 8-fold H 2 O, the TPA yield has significantly reduced from 90% to 25%. 91 Different from the mechanism in hydrolysis of PET, another strategy that utilizes more reactive small-molecule nucleophiles including hydroxyls and amines has proven effective in transforming PET waste into its monomeric derivatives. Examples of this strategy include the transesterification between ester linkages and methanol (i.e., methanolysis) or EG (i.e., glycolysis), and the transamination between ester linkages and amines (i.e., aminolysis) or ammonia (i.e., ammonolysis).…”

Section: Poly(ethylene Terephthalate)mentioning

confidence: 99%

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Chemical Recycling of Step-Growth Polymers Guided by Le Chatelier’s Principle

Liu,

2024

ACS Eng. Au

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Although step-growth polymers (SGPs) play a fundamental role in the plastics economy, contributing significantly to various facets of our daily life, their end-of-life management remains inadequately addressed. Chemical recycling of SGP wastes, involving depolymerization followed by repolymerization, emerges as a promising solution toward achieving a circular plastics economy. The depolymerization of SGPs is usually in dynamic equilibrium with their polymerization reactions, thus falling under a system amenable to Le Chatelier's principle. This perspective endeavors to elucidate the interplay between Le Chatelier's principle and the chemical recycling of SGPs with a particular emphasis on the guidance provided by the principle in the latter process. To this end, we have selected five conventional SGPs, namely, poly(ethylene terephthalate), polyamides, polycarbonates, polyurethanes, and polyureas, as representatives to elucidate how alterations in temperature, pressure, concentrations of products or reactants, and catalysts influence the depolymerization process of SGPs. Additionally, the perspective proposes several potential strategies for achieving the chemical recycling of SGPs by applying Le Chatelier's principle.

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Section: Examples Of Chemical Recycling Of Step-growth Polymersmentioning

confidence: 92%

Section: Examples Of Chemical Recycling Of Step-growth Polymersmentioning

confidence: 99%

Section: Poly(ethylene Terephthalate)mentioning

confidence: 99%

Section: Poly(ethylene Terephthalate)mentioning

confidence: 99%

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Chemical Recycling of Step-Growth Polymers Guided by Le Chatelier’s Principle

Liu,

2024

ACS Eng. Au

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Circular Economy and Chemical Conversion for Polyester Wastes

Cao,

Qiu,

Zhang

et al. 2024

ChemSusChem

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Polyester waste in the environment threatens public health and environmental ecosystems. Chemical recycling of polyester waste offers a dual solution to ensure resource sustainability and ecological restoration. This minireview highlights the traditional recycling methods and novel recycling strategies of polyester plastics. The conventional strategy includes pyrolysis, carbonation, and solvolysis of polyesters for degradation and recycling. Furthermore, the review delves into exploring emerging technologies including hydrogenolysis, electrocatalysis, photothermal, photoreforming, and enzymatic for upcycling polyesters. It emphasizes the selectivity of products during the polyester conversion process and elucidates conversion pathways. More importantly, the separation and purification of the products, the life cycle assessment, and the economic analysis of the overall recycling process are essential for evaluating the environmental and economic viability of chemical recycling of waste polyester plastics. Finally, the review offers perspective into the future challenges and developments of chemical recycling in the polyester economy.

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