Propane‐1,2‐diols from Dilactides, Oligolactides, or Poly‐<scp>L</scp>‐lactic Acid (PLLA): From Plastic Waste to Chiral Bulk Chemicals

Shuklov, Ivan A.; Dubrovina, Natalia V.; Schulze, Joachim; Tietz, Wolfgang; Kühlein, Klaus; Börner, Armin

doi:10.1002/chem.201302004

Cited by 8 publications

(7 citation statements)

References 42 publications

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“…Mixed waste streams were also considered with a PLA and poly(propylene) mixture affording PG and MeOH. Shuklov et al [159] have exploited the use of a barium-promoted copper chromite (Cu/Cr/Ba) heterogeneous catalyst at 150 bar (H 2 ) for the reduction of PLA and lactide to PG. This process is characterised by a tandem reaction whereby Me-LA is initially formed by methanolysis, which is subsequently reduced to PG via hydrogenation.…”

Section: Reductive Depolymerisationmentioning

confidence: 99%

“…In principle, these processes make use of a waste feedstock to access green PG, which is traditionally produced from the petroleum-based hydrogen peroxide propylene oxide (HPPO) process at a scale of approximately 1 million tonnes per year. [159] Simple 1,2-diols, such as PG, are high-value speciality chemical intermediates used in a diverse range of applications, including the manufacture of biodegradable polyester fibres, unsaturated polyester resins and pharmaceuticals, to name but a few. [160] Hydrosilylation strategies are also a possible route to higher-value chemicals such as silyl ethers (Figure 8).…”

Section: Reductive Depolymerisationmentioning

confidence: 99%

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The Chemical Recycling of Polyesters for a Circular Plastics Economy: Challenges and Emerging Opportunities

2021

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Whilst plastics have played an instrumental role in human development, growing environmental concerns have led to increasing public scrutiny and demands for outright bans. This has stimulated considerable research into renewable alternatives, and more recently, the development of alternative waste management strategies. Herein, the aim was to highlight recent developments in the catalytic chemical recycling of two commercial polyesters, namely poly(lactic acid) (PLA) and poly (ethylene terephthalate) (PET). The concept of chemical recy-cling is first introduced, and associated opportunities/challenges are discussed within the context of the governing depolymerisation thermodynamics. Chemical recycling methods for PLA and PET are then discussed, with a particular focus on upcycling and the use of metal-based catalysts. Finally, the attention shifts to the emergence of new materials with the potential to modernise the plastics economy. Emerging opportunities and challenges are discussed within the context of industrial feasibility.

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Section: Reductive Depolymerisationmentioning

confidence: 99%

Section: Reductive Depolymerisationmentioning

confidence: 99%

The Chemical Recycling of Polyesters for a Circular Plastics Economy: Challenges and Emerging Opportunities

2021

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“…Shuklov et al investigated the heterogeneous transformation of PLA and lactide into PG using barium promoted copper chromite (Cu/Cr/Ba) and H 2 (150 bar) [146]. The process is described as a tandem reaction whereby the Me-La is formed by methanolysis followed by hydrogenation to the diol.…”

Section: Methodsmentioning

confidence: 99%

The Chemical Recycling of PLA: A Review

McKeown

Jones

2020

Sustainable Chemistry

144

118

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Plastics are an indispensable material with numerous benefits and advantages compared to traditional materials, such as glass and paper. However, their widespread use has caused significant environmental pollution and most plastics are currently nonrenewable. Biobased polymers represent an important step for tackling these issues, however, the end-of-life disposal of such materials needs to be critically considered to allow for a transition to a circular economy for plastics. Poly(lactic acid) (PLA) is an important example of a biobased polymer, which is also biodegradable. However, industrial composting of PLA affords water and carbon dioxide only and in the natural environment, PLA has a slow biodegradation rate. Therefore, recycling processes are important for PLA, particularly chemical recycling, which affords monomers and useful platform chemicals, maintaining the usefulness and value of the material. This review covers the different methods of PLA chemical recycling, highlighting recent trends and advances in the area.

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“…The lactide alcoholysis can be carried out in combination with hydrogenation resulting in the formation of 1,2propanediol [292,293]. The reaction is carried out at 150°C in an autoclave under 15 MPa in a hydrogen atmosphere in the presence of a catalyst.…”

Section: Fig 51 Mechanism Of L-lactide Alcoholysis By Methanolmentioning

confidence: 99%

Syntheses and chemical transformations of glycolide and lactide as monomers for biodegradable polymers

Ботвин

Karaseva

Salikova

et al. 2021

Polymer Degradation and Stability

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Glycolide and lactide function as the commonly used diester monomers for the preparation of high-molecular weight, degradation-prone (co-)polyesters. Both glycolide and lactide-based polymers are widely used in medicine, pharmaceuticals, the food industry, and additive technologies. This review on the diesters, spanning research from 1833-1854 to the present, encompassing their structural peculiarities, physico-chemical properties, and the range of different methods for obtaining themincluding reaction mechanismsfrom lactic and glycolic acids, their esters, and halogen derivatives. The review also discusses the chemical transformations of lactide and glycolide (apart from ring-opening polymerization) into valuable organic and high-molecular compounds, such as acrylic acid, nitrogen-containing heterocycles, and functional polymers with novel properties.

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Propane‐1,2‐diols from Dilactides, Oligolactides, or Poly‐L‐lactic Acid (PLLA): From Plastic Waste to Chiral Bulk Chemicals

Cited by 8 publications

References 42 publications

The Chemical Recycling of Polyesters for a Circular Plastics Economy: Challenges and Emerging Opportunities

The Chemical Recycling of Polyesters for a Circular Plastics Economy: Challenges and Emerging Opportunities

The Chemical Recycling of PLA: A Review

Syntheses and chemical transformations of glycolide and lactide as monomers for biodegradable polymers

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