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Mechanical and chemical recycling of solid plastic waste
Abstract
This review presents a comprehensive description of the current pathways for recycling of polymers, via both mechanical and chemical recycling. The principles of these recycling pathways are framed against current-day industrial reality, by discussing predominant industrial technologies, design strategies and recycling examples of specific waste streams. Starting with an overview on types of solid plastic waste (SPW) and their origins, the manuscript continues with a discussion on the different valorisation options for SPW. The section on mechanical recycling contains an overview of current sorting technologies, specific challenges for mechanical recycling such as thermo-mechanical or lifetime degradation and the immiscibility of polymer blends. It also includes some industrial examples such as polyethylene terephthalate (PET) recycling, and SPW from post-consumer packaging, end-of-life vehicles or electr(on)ic devices. A separate section is dedicated to the relationship between design and recycling, emphasizing the role of concepts such as Design from Recycling. The section on chemical recycling collects a state-of-the-art on techniques such as chemolysis, pyrolysis, fluid catalytic cracking, hydrogen techniques and gasification. Additionally, this review discusses the main challenges (and some potential remedies) to these recycling strategies and ground them in the relevant polymer science, thus providing an academic angle as well as an applied one.
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“In a real-life sorting of mixed plastic waste streams, separation occurs physically by sink-flow density separation or mechanical sorting after NIR analysis. 10”
From Closed-loop recycling of polyethylene-like materials (2021) · cites this paper as [10]
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Metadata
- Authors
- Ragaert, K., Delva, L., & Van Geem, K.
- Affiliations
- Ghent University (BE)
- Corresponding author
- Ragaert, Kim
- Venue
- Waste Management
- Publisher
- Elsevier BV
- Published
- 2017-11
- Volume
- 69
- Pages
- 24-58
- ISSN
- 0956-053X (ISSN-L)
- OpenAlex
- W2749550903
- Semantic Scholar
- f8a9cccee3f8a964641f4253e6d9965dfee0a17d
- Cited by
- 3,276
- References
- 191
- Citations by year
- 2026: 531 · 2025: 598 · 2024: 505 · 2023: 486 · 2022: 397 · 2021: 347 · 2020: 235 · 2019: 111 · 2018: 61 · 2017: 5
- FWCI
- 8.20
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Waste Management (publishedVersion)
- PubMed (publishedVersion)
- Ghent University Academic Bibliography (Ghent University) (submittedVersion)
- Topics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Environmental Science › Waste Management and Disposal › Waste Management and Recycling
- Physical Sciences › Environmental Science › Waste Management and Disposal › Recycling and Waste Management Techniques
- Keywords
- mechanical recycling, chemical recycling, polymer recycling, thermomechanical degradation, PET recycling, post-consumer packaging, end-of-life vehicles, electronic waste, design for recycling, chemolysis, pyrolysis, fluid catalytic cracking, hydrogen-induced cracking, gasification, waste valorization
- MeSH terms
- Plastics, Polyethylene Terephthalates, Polymers, Product Packaging, Recycling, Solid Waste
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