Beyond Mechanical Recycling: Giving New Life to Plastic Waste

Beyond Mechanical Recycling: Giving New Life to Plastic Waste

2020 | Ina Vollmer, Michael J. F. Jenks, Mark C. P. Roelands, Robin J. White, Toon van Harmelen, Paul de Wild, Gerard P. van der Laan, Florian Meirer, Jos T. F. Keurentjes, and Bert M. Weckhuysen
This review discusses the importance of chemical recycling in addressing the growing problem of plastic waste. Traditional mechanical recycling methods are limited in their ability to handle contaminated and mixed plastic waste streams, necessitating alternative approaches. Chemical recycling methods, such as solvolysis, dissolution/precipitation, and pyrolysis, offer promising solutions for recovering valuable materials from plastic waste. These processes can produce monomers, oligomers, and other chemicals that can be used to create new plastics, supporting a circular economy. The review highlights various chemical recycling technologies, including solvolysis, which involves breaking down polymers using solvents to recover monomers. Processes like glycolysis and methanolysis are used to depolymerize PET and other plastics, producing monomers that can be re-polymerized into new materials. Dissolution/precipitation processes are also discussed, which can separate different polymers from mixed waste streams, enabling more efficient recycling. Pyrolysis, which involves heating plastic waste in the absence of oxygen, can produce fuel-like products and can be further upgraded to produce monomers for new plastics. The review also discusses emerging technologies such as microwave-assisted solvolysis and plasma reactors, which can improve the efficiency and selectivity of chemical recycling processes. The review emphasizes the need for improved collection and sorting infrastructure, stricter regulations, and collaboration among stakeholders to achieve higher recycling rates. It also highlights the importance of life-cycle analysis in assessing the environmental impact of different recycling methods. The review concludes that chemical recycling has the potential to significantly reduce plastic waste and support a circular economy by providing sustainable alternatives to traditional disposal methods.This review discusses the importance of chemical recycling in addressing the growing problem of plastic waste. Traditional mechanical recycling methods are limited in their ability to handle contaminated and mixed plastic waste streams, necessitating alternative approaches. Chemical recycling methods, such as solvolysis, dissolution/precipitation, and pyrolysis, offer promising solutions for recovering valuable materials from plastic waste. These processes can produce monomers, oligomers, and other chemicals that can be used to create new plastics, supporting a circular economy. The review highlights various chemical recycling technologies, including solvolysis, which involves breaking down polymers using solvents to recover monomers. Processes like glycolysis and methanolysis are used to depolymerize PET and other plastics, producing monomers that can be re-polymerized into new materials. Dissolution/precipitation processes are also discussed, which can separate different polymers from mixed waste streams, enabling more efficient recycling. Pyrolysis, which involves heating plastic waste in the absence of oxygen, can produce fuel-like products and can be further upgraded to produce monomers for new plastics. The review also discusses emerging technologies such as microwave-assisted solvolysis and plasma reactors, which can improve the efficiency and selectivity of chemical recycling processes. The review emphasizes the need for improved collection and sorting infrastructure, stricter regulations, and collaboration among stakeholders to achieve higher recycling rates. It also highlights the importance of life-cycle analysis in assessing the environmental impact of different recycling methods. The review concludes that chemical recycling has the potential to significantly reduce plastic waste and support a circular economy by providing sustainable alternatives to traditional disposal methods.
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