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Chemical Depolymerization of High- and Low-density Polyethylene Using Acid Treatments and Ozonation
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Researchers investigated two low-energy chemical alternatives to pyrolysis for depolymerizing polyethylene: acid treatment and catalytic ozonation. Acid processing of HDPE yielded predominantly large dicarboxylic acid products with up to 110% mass yields, while ozonation of LDPE produced water-soluble dicarboxylic acids and insoluble oxidized material, with process optimization and repeated stages improving carbon efficiency.
Economic depolymerization of polyolefins is largely limited to high temperature, energy intensive pyrolysis techniques. Achieving sustainable circularity for low-cost plastics requires inexpensive processes that are not energy intensive; two such promising candidates, acid treatment and ozonation, are investigated. These approaches are being investigated to create value-added products while minimizing the generation of carbon dioxide. The acid process utilizes a mixture of acids combined with a catalyst to oxidize high-density polyethylene (HDPE) to predominantly large molecular weight dicarboxylic acid products with acid numbers and mass yields ranging between 1.0-1.2 mmol/g and 70-110% (g product/g HDPE), respectively. The catalytic ozone technique processes low-density polyethylene (LDPE) to provide water-soluble dicarboxylic acids in yields up to 15% (g product carbon/ g LDPE carbon) and insoluble material at acid numbers averaging 2.4-4.8 mmol/g. Process optimization and the use of repeated stages can improve the carbon efficiency of these processes.
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Polyethylene Upcycling to Diacids Using Acid-Only Activation
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Researchers developed an acid-only activation process using chlorosulfuric acid and sulfuric acid mixtures to sulfonate polyethylene waste, enabling subsequent depolymerization with H2O2 and Fe(III) catalyst to achieve molar yields of C2-C4 diacids exceeding 40%, eliminating the need for costly organic solvents in plastic upcycling.
Research progress and challenges in the upcycling of polyolefin plastics through chemical oxidation
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This review surveys advances in chemical oxidation strategies for upcycling waste polyolefin plastics—including thermal catalytic, photocatalytic, photo-thermal, and electrocatalytic oxidation—finding that while each approach has converted polyolefins into higher-value oxygenated chemicals under increasingly mild conditions, challenges in catalyst efficiency, product selectivity, and reaction scale-up must be overcome before practical deployment.
Chemical Recycling and Upcycling of Plastic Waste: from Linear to Circular Economy
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Right now, only about 9% of plastic waste actually gets recycled, and most of what does get recycled turns into lower-quality material—not a real solution to the mountains of plastic piling up in our environment (and breaking down into the microplastics we're increasingly finding in our bodies). This review rounds up newer "chemical recycling" methods that can break plastic waste down to its molecular building blocks and even transform it into useful products like lubricants, offering a more promising path to actually reusing plastic instead of just downgrading it. These technologies are still working through real challenges like cost and efficiency before they can make a major dent in the plastic p
Chemical Recycling and Upcycling of Plastic Waste: from Linear to Circular Economy
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This review paper rounds up scientific progress on turning plastic waste into new chemicals and materials—instead of just melting it down into lower-quality plastic (what most "recycling" does today, and only for 9% of waste). Better recycling methods matter for your health because plastic that isn't properly processed often ends up in landfills, oceans, or breaking down into microplastics that contaminate our food, water, and even our bodies. These emerging chemical methods could help close the loop on plastic waste, though the researchers note real challenges remain before this happens at scale, including cost and technical hurdles.
Depolymerization within a Circular Plastics System
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This review examines chemical depolymerization as a route to producing virgin-quality recycled plastics from complex waste streams that mechanical recycling cannot handle, covering five commercial polymers including PET, polycarbonates, and polyurethanes. The authors argue that depolymerization must be understood within the broader system of recycling technologies and economic constraints to advance a truly circular plastics economy.
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