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61,005 resultsShowing papers similar to Chemical recycling of polyolefins: a closed-loop cycle of waste to olefins
ClearRecent Advances in Catalytic Chemical Recycling of Polyolefins
This review examines recent scientific advances in catalytic chemical recycling of polyolefins such as polyethylene and polypropylene, which account for nearly 50% of all plastic production by mass. Researchers highlight catalytic processes that can break down polyolefin waste at lower temperatures than pyrolysis, with the goal of upcycling discarded plastics into functional chemicals rather than sending them to landfill.
Cross-Linked Polyolefins: Opportunities for Fostering Circularity Throughout the Materials Lifecycle
This review examines cross-linked polyolefins, a significant class of plastics that are typically incinerated or landfilled because they cannot be melted for reprocessing. Researchers assessed both traditional mechanical recycling and advanced recycling methods for improving circularity of these materials. The study highlights opportunities to reduce plastic waste through biobased feedstocks, extended product lifespans, and recyclable-by-design strategies for future cross-linked polyolefin products.
Conversion of Polyolefin Waste Into Fuels and Other Valuable Products by Hydrothermal Processing
This research explored ways to convert plastic waste, including polyolefins like polyethylene and polypropylene, into usable fuels and other valuable products through hydrothermal processing. Finding efficient recycling pathways is critical given that only 9% of the 350 million tons of plastic waste generated annually is currently recycled.
Expanding plastics recycling technologies: chemical aspects, technology status and challenges
This review examined the full life cycle of plastics and evaluated options for managing plastic waste, with a focus on chemical recycling technologies. The study suggests that overcoming barriers to industrial chemical recycling could open new opportunities for reducing plastic pollution.
Recent Progress in Polyolefin Plastic: Polyethylene and Polypropylene Transformation and Depolymerization Techniques
This review covers new methods for breaking down polyethylene and polypropylene, the two most common types of plastic, into reusable materials. Since mechanical recycling only handles a small fraction of plastic waste, chemical approaches like pyrolysis and hydrogenolysis offer more promising solutions. These techniques are important because the breakdown of these same plastics into microplastics is a major source of environmental and health contamination.
Sistemas de revalorización de poliolefinas procedentes de residuos sólidos urbanos
This Spanish thesis examined systems for recovering and reusing polyolefin plastics from municipal solid waste, evaluating mechanical and chemical recycling approaches. Improving plastic recovery rates reduces the volume of plastic waste that eventually fragments into microplastics in landfills and the environment.
Sustainable Petrochemical Alternatives From Plastic Upcycling
This review examined pathways for upcycling plastic waste into sustainable petrochemical alternatives, addressing the poor end-of-life recovery prospects that allow carbon-rich plastics to degrade into microplastics in landfills and oceans. The paper assessed chemical and thermochemical conversion technologies that could turn plastic waste into feedstocks for the chemical industry.
Current Advances and Challenges in Chemical Recycling of Polymeric Materials
This review examines current advances and remaining challenges in chemical recycling of polymeric materials as an alternative to mechanical recycling, which degrades material properties with repeated cycling. The authors discuss the high efficiency and simpler preprocessing requirements of chemical recycling methods against a backdrop of approximately 150 million metric tonnes of annual global plastic waste generation.
Perspectives on sustainable plastic treatment: A shift from linear to circular economy
This review examines emerging technologies for converting plastic waste into useful chemicals and fuels, including methods like pyrolysis, photocatalysis, and electrocatalysis. Researchers highlight how these approaches could shift plastic management from a throw-away model to a circular economy where waste becomes a resource. The study identifies remaining knowledge gaps and proposes future research directions for sustainable plastic treatment.
Chemical Recycling of Plastics by Microwave‐Assisted High‐Temperature Pyrolysis
Researchers developed a microwave-assisted high-temperature pyrolysis method that continuously breaks down mixed plastic waste and plant oil into useful chemicals like ethylene and propylene. This chemical recycling approach could help divert plastic waste from the environment while producing renewable building blocks for new materials.
Perspectives on Thermochemical Recycling of End-of-Life Plastic Wastes to Alternative Fuels
This review examined thermochemical recycling technologies including pyrolysis, liquefaction, and gasification for converting plastic waste into clean fuels, discussing operating principles, barriers, and the potential for co-processing plastics with biomass.
Review and Design Overview of Plastic Waste-to-Pyrolysis Oil Conversion with Implications on the Energy Transition
This review analyzes the process of converting plastic waste into usable oil through pyrolysis, a thermal breakdown process conducted without oxygen. Researchers found that plastic waste has energy content comparable to conventional fuel oil, making pyrolysis an attractive waste-management and energy-recovery option. The study discusses the technical design considerations and suggests that scaling up this technology could contribute to both reducing plastic pollution and supporting the energy transition.
Upcycling of waste plastics: strategies, status-quo, and prospects
This review examines strategies for upcycling waste plastics into valuable products as an alternative to landfilling and incineration, which generate microplastics and carbon emissions respectively. Researchers survey chemical recycling methods including pyrolysis, gasification, and catalytic processes that can convert common plastics like PET, polyethylene, and polystyrene into fuels, chemicals, and new materials. The study highlights the urgent need for more effective recycling technologies to address the growing gap between plastic production and waste management capacity.
Beyond Mechanical Recycling: Giving New Life to Plastic Waste
This review examines chemical recycling processes — including pyrolysis, solvolysis, and gasification — as alternatives to mechanical recycling for plastic waste, comparing their technical readiness, environmental performance via life-cycle analysis, and commercial development status.
Reimagining plastics waste as energy solutions: challenges and opportunities
This review examines the potential of converting plastic waste into energy through waste-to-energy and waste-to-fuel technologies, particularly in developing nations where recycling infrastructure is limited. Researchers assessed various conversion methods including pyrolysis and gasification, evaluating their efficiency and environmental trade-offs. The study emphasizes that energy recovery from plastic waste could help address both the growing plastic pollution crisis and energy needs in underserved regions.
Light-driven polymer recycling to monomers and small molecules
Researchers reviewed how sunlight can be harnessed to chemically break down plastic waste into reusable molecules, offering a lower-energy alternative to heat-based recycling methods like pyrolysis. While still limited to certain plastic types, light-driven recycling shows promise for converting hard-to-recycle plastics into valuable chemical building blocks.
Process Optimization of Solvents Assisted Polyethylene Waste Recycling
Researchers optimized solvent-based chemical recycling of polyethylene plastic waste to recover high-quality recycled material. The study demonstrates that chemical recycling can be tuned to maximize yield and quality, offering a scalable alternative to mechanical recycling that degrades plastic properties over time.
Recovery of plastic waste through its thermochemical degradation: a review
This review examines pyrolysis as a promising technology for recovering valuable chemical compounds from plastic waste, which reached approximately 368 million tons of global production in 2020 alone. Researchers discuss how thermal and catalytic degradation can convert different types of thermoplastics into high-energy-value products. The study also highlights the environmental and health impacts of plastic accumulation, including the effects of microplastic consumption on human and animal health.
Research progress on chemical depolymerization and upcycling of PET waste plastics
This review examines recent advances in chemical methods for breaking down polyethylene terephthalate (PET) waste plastics into useful raw materials. Researchers surveyed techniques including glycolysis, methanolysis, hydrolysis, and aminolysis that can convert PET back into monomers for reuse. The study highlights chemical depolymerization as a promising approach to reduce plastic pollution while recovering valuable materials from waste.
Precise activation of C–C bonds for recycling and upcycling of plastics
This perspective examines strategies for recycling and upcycling polyolefin plastics by precisely activating and cleaving the inert carbon-carbon bonds in plastic waste. Researchers surveyed catalytic approaches from related chemistry fields, including lignin degradation and alkane dehydrogenation, that could inspire new methods for breaking down plastics. The study highlights cross-disciplinary opportunities for developing more effective catalytic technologies to address the growing plastic waste crisis.
Emerging Technologies for Waste Plastic Treatment
This review surveyed emerging technologies for waste plastic treatment including chemical recycling, pyrolysis, biodegradation, and catalytic conversion, evaluating their potential to address the growing plastic pollution crisis more effectively than conventional methods.
Thermochemical and chemo-biological molecular recycling of plastic waste and plastic-biomass waste mixtures: an updated review
This review covers thermochemical and chemo-biological approaches to recycling plastic waste and plastic-biomass waste mixtures into valuable building block molecules. The study highlights that while thermochemical and bioprocessing methods show promise, the chemo-enzymatic treatment of mixed plastic-biomass waste streams remains an open challenge due to their diverse composition.
Are Reliable and Emerging Technologies Available for Plastic Recycling in a Circular Economy?
This review examines the current landscape of plastic recycling technologies -- including mechanical, thermal, chemical, and biological depolymerization methods such as pyrolysis -- evaluating their readiness for circular economy integration. It concludes that while recycling rates remain below 10% globally, emerging technologies offer pathways toward closed-loop plastic supply chains, though full-scale implementation requires further development and performance assessment.
Approaches for Management and Valorization of Non-Homogeneous, Non-Recyclable Plastic Waste
This review examined management and valorization strategies for non-homogeneous, non-recyclable plastic waste, evaluating chemical recycling, energy recovery, and upcycling approaches as pathways to reduce environmental plastic accumulation and recover value from difficult-to-process waste streams.