Selective Degradation of End‐of‐Life Poly(lactide) via Alkali‐Metal‐Halide Catalysis

Alberti, Christoph; Damps, Nicole; Meißner, Roderich R. R.; Hofmann, M.; Rijono, Desiree; Enthaler, Stephan

doi:10.1002/adsu.201900081

Cited by 35 publications

(26 citation statements)

References 77 publications

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“…In general, reasonably good catalyst activity was observed under milder reaction conditions compared to previously reported recycling systems. 14,15,18,33,37,38,43,[65][66][67][68][69] In all instances, an increase in temperature coincided with higher Me-LA yield (Y Me-LA ) and shorter reaction times, consistent with the literature. 35,41,43 Zn(2) 2 exhibited superior activity compared to Zn(1,3) 2 at 50°C, suggesting inductive effects dominate, whilst Zn(1) 2 exhibited the lowest degradation activity, both consistent with polymerisation results (Table 3).…”

Section: Degradationsupporting

confidence: 84%

Mono- and dimeric zinc(ii) complexes for PLA production and degradation into methyl lactate – a chemical recycling method

et al. 2020

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Section: Degradationsupporting

confidence: 84%

Mono- and dimeric zinc(ii) complexes for PLA production and degradation into methyl lactate – a chemical recycling method

et al. 2020

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“…On the other hand, an increase to 180 °C showed an excellent TOF of 13500 h −1 (Table , entry 15). Noteworthy, the bismuth subsalicylate catalyst outperforms our earlier reported systems, e. g. DMAP (∼178 h −1 ) and KF (∼816 h −1 ), only the Sn(Oct) 2 revealed a higher TOF of 39600 h −1 …”

Section: Methodscontrasting

confidence: 52%

Application of Bismuth Catalysts for the Methanolysis of End‐of‐Life Poly(lactide)

2020

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The chemical recycling of poly(lactide) (PLA) was investigated especially the depolymerization for generating useful monomers/polymer precursors. In more detail, applying catalytic amounts of bismuth compounds PLA was converted to methyl lactate using methanol as depolymerization reagent. An excellent performance was observed for bismuth subsalicylate with turnover frequencies of up to 13,800 h À 1 using microwave heating. Moreover, the usefulness of the bismuth subsalicylate catalyst was demonstrated in the depolymerization of various PLA goods. Interestingly, the bismuth subsalicylate was easily recovered after the reaction and was sent again to depolymerization revealing recyclability of the catalyst.

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“…ALs can also be produced from the alcoholysis reaction of poly(lactic acid) (PLA) [28][29][30][31][32][33][34]. PLA is seen as a substitute for petroleum-derived polymers that can be produced from renewable sources [35].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Alkyl Lactate Formation from the Alcoholysis of Poly(Lactic Acid)

et al. 2020

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Alkyl lactates are green solvents that are successfully employed in several industries such as pharmaceutical, food and agricultural. They are considered prospective renewable substitutes for petroleum-derived solvents and the opportunity exists to obtain these valuable chemicals from the chemical recycling of waste poly(lactic acid). Alkyl lactates (ethyl lactate, propyl lactate and butyl lactate) were obtained from the catalysed alcoholysis reaction of poly(lactic acid) with the corresponding linear alcohol. Reactions were catalysed by a Zn complex synthesised from an ethylenediamine Schiff base. The reactions were studied in the 50–130 °C range depending on the alcohol, at autogenous pressure. Arrhenius temperature-dependent parameters (activation energies and pre-exponential factors) were estimated for the formation of the lactates. The activation energies (Ea1, Ea2 and Ea−2) for alcoholysis in ethanol were 62.58, 55.61 and 54.11 kJ/mol, respectively. Alcoholysis proceeded fastest in ethanol in comparison to propanol and butanol and reasonable rates can be achieved in temperatures as low as 50 °C. This is a promising reaction that could be used to recycle end-of-life poly(lactic acid) and could help create a circular production economy.

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Selective Degradation of End‐of‐Life Poly(lactide) via Alkali‐Metal‐Halide Catalysis

Cited by 35 publications

References 77 publications

Mono- and dimeric zinc(ii) complexes for PLA production and degradation into methyl lactate – a chemical recycling method

Mono- and dimeric zinc(ii) complexes for PLA production and degradation into methyl lactate – a chemical recycling method

Application of Bismuth Catalysts for the Methanolysis of End‐of‐Life Poly(lactide)

Kinetics of Alkyl Lactate Formation from the Alcoholysis of Poly(Lactic Acid)

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