Acid catalyst screening for hydrolysis of post-consumer PET waste and exploration of acidolysis

Pereira, Patrícia; Savage, Phillip E.; Pester, Christian W.

doi:10.1039/d3gc03906d

Cited by 12 publications

(3 citation statements)

References 46 publications

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“…Isothermal processes typically have ξ around 10 4 °C min. 9,19 The previous lowest ξ (235 ± 44 °C min) was achieved from fast hydrolysis at a set point temperature of 500 °C with a reaction time of 1 minute and a PET/water mass ratio of 1/3. 12 This value was based on three independent experimental runs.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, we used an empirical severity index (SI), 28 which combines the effects of temperature and time to facilitate the comparison of results over the wide range of reaction conditions used in these experiments. The severity index can be calculated as 9 where E a is the activation energy of 1.19 × 10 5 J mol −1 and A is the pre-exponential factor of 1.66 × 10 8 min −1 . These values were obtained by modelling PET depolymerization into TPA via neutral hydrolysis as a pseudo first-order reaction.…”

Section: Resultsmentioning

confidence: 99%

“…Conventional neutral hydrolysis or catalyzed hydrolysis under isothermal conditions has an environmental energy impact metric of at least 10 4 °C min. 9,19 This metric is widely used in this field, and it accounts for environmental impacts related to energy demand, waste production, and product yield. Using microwave heating during base-catalyzed hydrolysis can decrease the environmental energy impact metric by one order of magnitude.…”

Section: Introductionmentioning

confidence: 99%

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Fast hydrolysis for chemical recycling of polyethylene terephthalate (PET)

Pereira,

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Testa

et al. 2024

RSC Sustain.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fast hydrolysis for chemical recycling of polyethylene terephthalate (PET)

Pereira,

Slear,

Testa

et al. 2024

RSC Sustain.

Self Cite

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Catalyst‐ and Solvent‐Free Upcycling of Poly(Ethylene Terephthalate) Waste to Biodegradable Plastics

Fang,

Jiang,

Zheng

et al. 2024

Advanced Materials

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Poly(ethylene terephthalate) (PET) is an important polymer with annual output second only to polyethylene. Due to its low biodegradability, a large amount of PET is recycled for sustainable development. However, current strategies for PET recycling are limited by low added value or small product scale. It is urgent to make a breakthrough on the principle of PET macromolecular reaction and efficiently prepare products with high added value and wide applications. Here, the catalyst‐ and solvent‐free synthesis of biodegradable plastics are reported through novel carboxyl‐ester transesterification between PET waste and bio‐based hydrogenated dimer acid (HDA), which can directly substitute some terephthalic acid (TPA) units in PET chain by HDA unit. This macromolecular reaction can be facilely carried out on current equipment in the polyester industry without any additional catalyst and solvent, thus enabling low‐cost and large‐scale production. Furthermore, the product semi‐bio‐based copolyester shows excellent mechanical properties, regulable flexibility and good biodegradability, which is expected to substitute poly(butylene adipate‐co‐terephthalate) (PBAT) plastic as high value‐added biodegradable materials. This work provides an environmental‐friendly and economic strategy for the large‐scale upcycling of PET waste.

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From Polyester Plastics to Diverse Monomers via Low‐Energy Upcycling

Ji,

Meng,

et al. 2024

Advanced Science

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Polyester plastics, constituting over 10% of the total plastic production, are widely used in packaging, fiber, single‐use beverage bottles, etc. However, their current depolymerization processes face challenges such as non‐broad spectrum recyclability, lack of diversified high‐value‐added depolymerization products, and crucially high energy consumption. Herein, an efficient strategy is developed for dismantling the compact structure of polyester plastics to achieve diverse monomer recovery. Polyester plastics undergo swelling and decrystallization with a low depolymerization energy barrier via synergistic effects of polyfluorine/hydrogen bonding, which is further demonstrated via density functional theory calculations. The swelling process is elucidated through scanning electron microscopy analysis. Obvious destruction of the crystalline region is demonstrated through X‐ray crystal diffractometry curves. PET undergoes different aminolysis efficiently, yielding nine corresponding high‐value‐added monomers via low‐energy upcycling. Furthermore, four types of polyester plastics and five types of blended polyester plastics are closed‐loop recycled, affording diverse monomers with exceeding 90% yields. Kilogram‐scale depolymerization of real polyethylene terephthalate (PET) waste plastics is successfully achieved with a 96% yield.

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Acid catalyst screening for hydrolysis of post-consumer PET waste and exploration of acidolysis

Abstract: We screen various acid catalysts (mineral, carboxylic, carbonic acids, zeolites, ionic liquids, and metal salts) for PET hydrolysis.

Cited by 12 publications

References 46 publications

Fast hydrolysis for chemical recycling of polyethylene terephthalate (PET)

Fast hydrolysis for chemical recycling of polyethylene terephthalate (PET)

Catalyst‐ and Solvent‐Free Upcycling of Poly(Ethylene Terephthalate) Waste to Biodegradable Plastics

From Polyester Plastics to Diverse Monomers via Low‐Energy Upcycling

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