Recycling and depolymerization of waste polyethylene terephthalate bottles by alcohol alkali hydrolysis

Sun, Conghao; Chen, Xiangping; Zhuo, Qiang; Zhou, Tao

doi:10.1007/s11771-018-3759-y

Cited by 32 publications

(17 citation statements)

References 19 publications

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“…Alcohol alkali hydrolysis of PET bottle in the presence of EG and sodium bicarbonate as the reaction media under atmospheric conditions was carried out 109 . The reason behind employing sodium bicarbonate as an alkali was to minimize the cost of the process and to improve the solubility of terephthalic acid salts.…”

Section: Chemical Recycling Of Petmentioning

confidence: 99%

Chemical recycling ofPET: A stepping‐stone toward sustainability

Shojaei

Abtahi

Najafi

2020

Polymers for Advanced Techs

170

113

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This paper focuses explicitly on the chemical approaches involved in the recycling of polyethylene terephthalate (PET). Due to the high rate of consumption as well as nonbiodegradability, PET plays a crucial role as one of the most significant sources of accumulated waste in the landfill which jeopardizes our planet. To address this issue as well as increased environmentally conscious, running out of landfill space, natural resource, and energy conservation, and producing value-added chemicals to use as building block or co-products, the chemical recycling methods have been evolved. Therefore, there has been an attempt to have a comprehensive review of the five types of conventional recycling methods namely hydrolysis, methanolysis, glycolysis, aminolysis, and ammonolysis studied by researchers over the last two decades. In this regard, the influence of diverse depolymerization reaction variables for instance, traditional catalyst, temperature profile, ionic liquid catalysts, phase transfer catalyst, microwave assistance, etc was reported. Moreover, the upsides and downsides of each technique were considered.

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Section: Chemical Recycling Of Petmentioning

confidence: 99%

Chemical recycling ofPET: A stepping‐stone toward sustainability

Shojaei

Abtahi

Najafi

2020

Polymers for Advanced Techs

170

113

View full text Add to dashboard Cite

show abstract

“…Different treatments have been developed in order to depolymerise PET waste [259,262,263]. The three major chemical routes for depolymerisation are glycolysis [264][265][266][267][268][269], methanolysis [270][271][272][273][274], and hydrolysis [270,[274][275][276][277][278][279][280][281], summarised in Figure 15. For glycolysis and hydrolysis transformations, researchers focussed on the selection of catalysts, which could offer a high yield, short process time, and more environmental friendliness [106,249,282,283].…”

Section: Chemical Recycling Of Petmentioning

confidence: 99%

Polyolefins and Polyethylene Terephthalate Package Wastes: Recycling and Use in Composites

et al. 2021

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Plastics are versatile materials used in a variety of sectors that have seen a rapid increase in their global production. Millions of tonnes of plastic wastes are generated each year, which puts pressure on plastic waste management methods to prevent their accumulation within the environment. Recycling is an attractive disposal method and aids the initiative of a circular plastic economy, but recycling still has challenges to overcome. This review starts with an overview of the current European recycling strategies for solid plastic waste and the challenges faced. Emphasis lies on the recycling of polyolefins (POs) and polyethylene terephthalate (PET) which are found in plastic packaging, as packaging contributes a signification proportion to solid plastic wastes. Both sections, the recycling of POs and PET, discuss the sources of wastes, chemical and mechanical recycling, effects of recycling on the material properties, strategies to improve the performance of recycled POs and PET, and finally the applications of recycled POs and PET. The review concludes with a discussion of the future potential and opportunities of recycled POs and PET.

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“…This technique allowed the recycling of PET waste that could not be further used and recycled by mechanical techniques like extrusion or injection moulding [19][20][21][22]. In most cases, the primary goal of glycolysis and other techniques such as methanolysis or hydrolysis was to reproduce PET and gain a new virgin material with identical or better properties than the original material [23][24][25][26][27][28]. Several methods like chain-extension during a reactive extrusion process were introduced the elongate the lifetime of the PET polymer were studied and developed [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

One-Pot Depolymerization and Polycondensation of PET Based Random Oligo- and Polyesters

et al. 2019

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The glycolysis of PET is a promising well-developed technique that could be utilized in a wide range of processes. Due to its equilibrial nature, the high ratio of reagents and the purification steps it is an expensive process. In this study our goal was to modify the standard glycolysis to an easily modulateable method (acido-alcoholysis) suited for one-pot oligoester, polyester synthesis. Adipic acid was added to the depolymerization reaction to connect low molecular weighed components into oligoesters. PET depolymerization reaction series were carried out with ethylene-glycol/adipic acid and butane-1,4-diol/ adipic acid to demonstrate the tuneability of these systems. The reaction products were thoroughly characterized with NMR, FTIR, TGA, DSC and functional group analysis. One-pot depolymerization-polycondensation reactions were engineered to produce unsaturated and saturated polyesters. The unsaturated polyesters were dissolved in styrene, cross-linked and moulded to be characterized with DMA. A decreasing tendency of the glass transition temperature and cross-link density were found in the function of the ratio of adipic acid used during the depolymerization step. Acido-alcoholysis proved to be a versatile technique that could be used to engineer oligoesters and polyesters. The reagent use can be minimalized, and the raw reaction products can be directly applied as mid-products.

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Recycling and depolymerization of waste polyethylene terephthalate bottles by alcohol alkali hydrolysis

Cited by 32 publications

References 19 publications

Chemical recycling ofPET: A stepping‐stone toward sustainability

Chemical recycling ofPET: A stepping‐stone toward sustainability

Polyolefins and Polyethylene Terephthalate Package Wastes: Recycling and Use in Composites

One-Pot Depolymerization and Polycondensation of PET Based Random Oligo- and Polyesters

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