Optimizing and developing a continuous separation system for the wet process separation of aluminum and polyethylene in aseptic composite packaging waste

Yan, Dahai; Peng, Zheng; Liu, Yuqiang; Li, Li; Huang, Qifei; Xie, Mowen; Wang, Qi

doi:10.1016/j.wasman.2014.10.008

Cited by 25 publications

(14 citation statements)

References 1 publication

(1 reference statement)

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“…[ 38 , 39 ] Likewise, in China recycling of composite packaging waste is carried out in a continuous industrial scale with a capacity of 50 t d −1 through Al−PE delamination using formic acid and nitric acid. [ 37 , 40 , 41 ] Although these technologies are able to obtain raw materials of high purity, they are limited to processing a single type of plastic structure at a given point in time. In all these cases it seems quite plausible that the processes can be improved if the fundamental understanding of the delamination mechanism is improved.…”

Section: Introductionmentioning

confidence: 99%

Towards a Better Understanding of Delamination of Multilayer Flexible Packaging Films by Carboxylic Acids

et al. 2021

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Recycling multilayer plastic packaging is challenging due to its intrinsic compositional heterogeneity. A promising route to increase recycling rates for these materials is delamination, which allows recycling the polymers separately. Yet, this process is not well understood on a fundamental level. This study aimed to obtain first principles-based insights of the delamination mechanism of multilayer flexible packaging film (MFPF) with carboxylic acids. Delamination of MFPFs was described through a model based on Fick's first law of diffusion and first-order dissolution kinetics of polyurethane adhesives. The model was experimentally tested on 5 different MFPFs at different temperatures (50-75°C), formic acid concentrations (50-100 vol %), and solid/liquid (S/L) ratios (0.005, 0.025, and 0.12 g mL À 1 ). Under the studied conditions the model proved to successfully estimate the delamination time of MFPF with the average Theil's Inequality Coefficient (TIC) value of 0.14. Essential for scaling-up delamination processes is the possibility to use high S/L ratios as the solubility of the adhesive is rarely limiting.

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Section: Introductionmentioning

confidence: 99%

Towards a Better Understanding of Delamination of Multilayer Flexible Packaging Films by Carboxylic Acids

et al. 2021

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“…Afterwards, both materials are recovered by for instance a sinkfloat separation. [72,73] In 2015, the German company Saperatec GmbH patented a method for recovery of saleable products from composite waste by using microemulsion comprising swelling agents, carboxylic acids, water, and surfactants. [74] Based on this patent, Saperatec has launched a project to build a recycling plant with a capacity of approximately 17000 t/a input.…”

Section: Delamination Technologiesmentioning

confidence: 99%

Recent Advances in Pre-Treatment of Plastic Packaging Waste

Kol¹,

Roosen²,

Üǧdüler³

et al. 2022

Waste Material Recycling in the Circular Economy - Challenges and Developments

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There is an urgent need to close the loop of plastic waste. One of the main challenges towards plastic packaging waste recycling is the presence of a variety of contaminants. These contaminants include organic residues, additives, labels, inks and also other plastic types that can be present in the waste stream due to missorting or in multimaterial structures (e.g. multilayer films in packaging). In this context, pre-treatment processes are a promising route to tackle the difficulties that are encountered in mechanical and chemical recycling due to these contaminants. This chapter gives better insight on the already existing pre-treatment techniques and on the advances that are being developed and/or optimized in order to achieve closed-loop recycling. Some of these advanced pre-treatments include chemical washing to remove inks (deinking), extraction methods to remove undesired plastic additives and dissolution-based pre-treatments, such as delamination and dissolution-precipitation techniques.

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“…Yan et al [84] studied a wet process technique on PolyAl and compared the separation efficiency achieved using different separation reagents (hydrochloric, methanoic and acetic acids). The impacts of a range of parameters such as the reagent concentration, temperature, and liquid-solid ratio, on the separation time and aluminum loss ratio were determined.…”

Section: Chemicalmentioning

confidence: 99%

Recycling of Aseptic Beverage Cartons: A Review

Robertson

2021

Recycling

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Aseptic beverage cartons are multilayer polymer-coated paperboards with a layer of aluminum foil. Due to their multilayer structure it is commonly assumed that they cannot be recycled. This is not the case and this review details the multifarious processes that are used to recycle aseptic beverage cartons. Hydrapulping to recover the paper fibers that constitute 75% of the carton is the most widespread process, followed by the manufacture of construction materials such as boards and tiles which utilize the complete carton. A range of mechanical, chemical and thermal processes are used to separate the PolyAl (polyethylene and aluminum) residual that remains after the paper fibers have been recovered. The simplest process involves agglutination followed by extrusion to obtain pellets that can then be used in industrial and consumer products or combined with other materials such as lignocellulosic wastes. Chemical approaches involve the solubilization of polyethylene and the removal of aluminum. Various thermal processes have also been investigated and a novel microwave-induced pyrolysis process appears the most commercially viable. It is concluded that the focus in future years is likely to be on recycling cartons into construction materials where there is a theoretical yield of 100% compared with 75% for hydrapulping.

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Optimizing and developing a continuous separation system for the wet process separation of aluminum and polyethylene in aseptic composite packaging waste

Cited by 25 publications

References 1 publication

Towards a Better Understanding of Delamination of Multilayer Flexible Packaging Films by Carboxylic Acids

Towards a Better Understanding of Delamination of Multilayer Flexible Packaging Films by Carboxylic Acids

Recent Advances in Pre-Treatment of Plastic Packaging Waste

Recycling of Aseptic Beverage Cartons: A Review

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