Oligoester and Polyester Production via Acido-alcoholysis of PET Waste

Kárpáti, Levente; Szarka, Györgyi; Hartman, Mátyás; Vargha, Viktória

doi:10.3311/ppch.11513

Cited by 14 publications

(8 citation statements)

References 51 publications

(67 reference statements)

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“…Alcoholysis of PET through combination with trimethylolpropane produce PVC plastisols when mixed with PVC under the zinc acetate catalyst (Kárpáti et al 2018). The main advantage of alcoholysis is that the process can be installed in the polymer production line as DMT produced is of the same quality as virgin DMT.…”

Section: Methanolysismentioning

confidence: 99%

Plastic Recycling of Polyethylene Terephthalate (PET) and Polyhydroxybutyrate (PHB)—a Comprehensive Review

et al. 2021

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As an integral part of plastic waste, large amounts of polyethylene terephthalate (PET), polyhydroxybutyrate (PHB), and solid waste have led to serious environmental problems. In order to identify critical barriers to the reuse of plastic across a wide range of plastic values all over the world, we need to go through PET and PHB in terms of volume. This is a significant factor for the world and our global warming. The current uses of plastic through PET and PHB are significant. Through the recycling process of PET and PHB, the total volume of plastic uses will be decreased and reuse rate will be high by economic, social, and environmental factors. Key areas are identified by low demand due to price considerations, insufficient tracking and transparency of pricing transactions, and lack of common design. Integration of value chains is considered to be the most important intervention for respondents, following the need for increased investment and technology development. Recycling helps the environment and creates new economic opportunities. Reuse of plastics encourages businesses to develop new and innovative products. Recycling reduces through extraction (mining, quarrying, and logging), refining, and processing of raw materials which create significant air and water pollution. As renewable energy saving also reduces greenhouse gas emissions, which help to cope with climate change. This paper aims to raise awareness that increase the demand of recycling process of PET and PHB and to identify critical barriers of recycling throughout a series of plastic prices with the volume.

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Section: Methanolysismentioning

confidence: 99%

Plastic Recycling of Polyethylene Terephthalate (PET) and Polyhydroxybutyrate (PHB)—a Comprehensive Review

et al. 2021

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“…They correspond to a reaction of PET with anhydrous ammonia and with amine in aqueous solution, respectively. Moreover, Kárpáti et al [287,288] recently developed a new chemical route for PET recycling by acido-alcoholysis which allowed the production of high quality oligoesters by combining depolymerisation and polycondensation in one step. Chemical treatments appear to be a very promising way to recycle waste PET because they offer the possibility to produce new virgin PET with good properties.…”

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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“…Depending on the goal of the solvolysis the reaction parameters can be tailored to produce BHET or oligomers that could be further used in new reactions [5,18,[37][38][39][40][41][42][43]. Usually, oligomers are discarded during the purification processes, only a few studies used these or the raw solvolysis product [44][45][46][47][48]. In most of the cases, the purpose of glycolysis is the reproduction PET via BHET.…”

Section: Introductionmentioning

confidence: 99%

“…The simultaneous use of diacids and diols resulted in higher molar weight and the complete absence of reagents in the reaction. [47].…”

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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Oligoester and Polyester Production via Acido-alcoholysis of PET Waste

Abstract: Abstract

Cited by 14 publications

References 51 publications

Plastic Recycling of Polyethylene Terephthalate (PET) and Polyhydroxybutyrate (PHB)—a Comprehensive Review

Plastic Recycling of Polyethylene Terephthalate (PET) and Polyhydroxybutyrate (PHB)—a Comprehensive Review

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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