Monomer recovery through advanced pyrolysis of waste high density polyethylene (HDPE)

Diaz-Silvarrey, Laura S.; Zhang, Kui; Phan, Anh N.

doi:10.1039/c7gc03662k

Cited by 125 publications

(62 citation statements)

References 57 publications

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“…[ 22 , 30 , 31 , 32 , 33 , 34 ] High‐density poly(ethylene) (HDPE) offers minimal monomer recovery (22–25 %), whilst high monomer yields (up to 94 %) have been reported for poly(propylene) (PP). [ 17 , 35 , 36 ] Such methods are practical from a plastic accumulation perspective and offer some net energy/material recovery. However, their high energy intensity releases damaging CO 2 emissions into the environment.…”

Section: Chemical Recycling Of Plasticsmentioning

confidence: 99%

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: Chemical Recycling Of Plasticsmentioning

confidence: 99%

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

2021

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“…Due to the inherent chemical inertness of polyolefins which are constructed by energetically stable CÀ C bonds, it may not be economically feasible to depolymerize them into monomers that pure enough to be repolymerized into virgin polymers, although a recent work reported the zeolite-catalyzed cold plasma treatment of waste HDPE, resulting in 22-25 % ethylene recovery. [33] Currently, pyrolysis, with or without catalyst, is the most intensively investigated methods, aiming at producing liquid fuels and hydrogen-rich gases that have relatively high commercial values. However, the inevitably high energy input and complex product distribution limit its further development.…”

Section: Chemical Upcycling Of Waste Plastics Into Value-added Fuels and Materialsmentioning

confidence: 99%

Waste to Wealth: Chemical Recycling and Chemical Upcycling of Waste Plastics for a Great Future

et al. 2021

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The linear approach to resource utilization has led to the accumulation of waste plastic in the environment for decades. Unfortunately, both traditional mechanical recycling and incineration have faced their bottlenecks that have always resulted in quality deterioration and value recovery failures. Recently, chemical recycling and upcycling processes, including the conversion of plastics into their virgin monomers, liquid fuels, or chemical feedstocks to produce value-added products, have been identified as the most promising strategy for recovering value from waste plastics. However, these methods are often cost prohibitive and relying on stringent conditions compared to current recycling methods. Accordingly, this Minireview summarizes recent trends and achievements in the chemical recycling and upcycling of waste plastics. We highlight three research topics: depolymerization of plastics into monomers; degradation of plastics into liquid fuels and waxes; and conversion of plastics into hydrogen, fine chemical feedstocks, and value-added functional materials. Indeed, chemical recycling and upcycling is a bright path to a circular and environmentally friendly plastic economy.

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“…This has resulted in widespread interest by the public, governments and businesses in options for reducing the volume of plastics used and discarded. Novel ongoing research into reducing impacts of conventional plastic waste is developing improvements to recycling technology [21] and the use of newly discovered microbes or enzymes to biodegrade conventional plastics [22]. Other approaches, such as the production of novel materials including biomass-derived plastic, may have unintended impacts.…”

Section: Ecological Effects Of Options For Reducing Plastic Pollutionmentioning

confidence: 99%

A Horizon Scan of Emerging Issues for Global Conservation in 2019

Sutherland

Broad²,

Butchart

et al. 2019

Trends in Ecology & Evolution

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We present the results of our tenth annual horizon scan. We identified 15 emerging priority topics that may have major positive or negative effects on the future conservation of global biodiversity, but which at present, have low awareness within the conservation community. We thus hope to focus increased research and policy attention on these areas, improving the capacity of the community to mitigate impacts of issues likely to have negative effects, and maximise the benefits of issues that provide opportunities. The topics include advances in crop breeding, which may affect insects and land use; manipulations of natural water flows and weather systems on the Tibetan Plateau; release of carbon and mercury from melting polar ice and thawing permafrost; new funding schemes and regulations; and land-use changes across Indo-Malaysia.

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Monomer recovery through advanced pyrolysis of waste high density polyethylene (HDPE)

Abstract: Cold plasma increases the recovery of ethylene opening up a new route for plastic manufacture avoiding the use of fossil fuels.

Cited by 125 publications

References 57 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

Waste to Wealth: Chemical Recycling and Chemical Upcycling of Waste Plastics for a Great Future

A Horizon Scan of Emerging Issues for Global Conservation in 2019

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