Study of polyethylene terephthalate glycolysis with a mixture of bis(2-hydroxyethyl) terephthalate and its oligomers

Kirshanov, Kirill; Томс, Р. В.

doi:10.35164/0554-2901-2021-3-4-50-52

Cited by 6 publications

(8 citation statements)

References 8 publications

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“…Bis(2-hydroxyethyl) terephthalate and oligoethylene terephthalates are known to be PET glycolysis agents, as well as ethylene glycol and diethylene glycol [19]. The proposed novel glycolysis method is compared with known heterogeneous glycolysis at a constant total reaction time of 1.5 h and 1 wt% zinc acetate catalyst relative to the weight of polyester fiber in the raw material.…”

Section: Glycolysismentioning

confidence: 99%

“…Bis(2-hydroxyethyl) terephthalate (sample BHET-1) was synthesized as follows [19]. Then, 100 g of post-consumer PET flakes were added to a solution of 2.28 g zinc acetate dihydrate in 250 g of ethylene glycol at 190 • C, followed by stirring at 200 rpm until the disappearance of the PET phase.…”

Section: Synthesis Of Glycolytic Agentsmentioning

confidence: 99%

“…To obtain oligoethylene terephthalate (sample OET-1) [19], 19 g of PET flakes were added to 50 g of molten BHET and kept at 190 • C for 2.5 h. Thereafter, the water-soluble components (BHET, EG, zinc acetate) were extracted with water during 10 h in a Soxhlet extractor. The precipitate was dried in an infrared dryer until constant weight was reached.…”

Section: Synthesis Of Glycolytic Agentsmentioning

confidence: 99%

“…The common catalyst is zinc acetate. The heterogeneous glycolysis is well described in the literature, but recently homogeneous processes in solution or melt have also been proposed [18,19]. Common glycolytic agents are ethylene glycol, diethylene glycol, and 1,2-propylene glycol.…”

Section: Introductionmentioning

confidence: 99%

“…Common glycolytic agents are ethylene glycol, diethylene glycol, and 1,2-propylene glycol. Glycolysis products, such as bis(2-hydroxyethyl) terephthalate (BHET) and oligoethylene terephthalates, could also be used as agents [19].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Polyester Tire Cord Glycolysis Accompanied by Rubber Crumb Devulcanization

et al. 2022

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A new method for the recycling of a polyester tire cord under the action of oligoethylene terephthalates, bis(2-hydroxyethyl) terephthalate and ethylene glycol has been proposed. The method involves simultaneous homogeneous glycolysis of polyethylene terephthalate and devulcanization of crumb rubber. Polyester cord and glycolysates were characterized by FTIR spectroscopy and gel permeation chromatography (GPC). The devulcanization process was investigated by swelling-based methods. The rate of the proposed method of homogeneous glycolysis in a melt phase was proved to be higher than one of the heterogeneous glycolysis. The assumption of a more efficient devulcanization in the presence of a softener was also confirmed. The degree of devulcanization 46.07%, the apparent degree of swelling 167.4%, and the apparent swelling rate constant 0.0902 min−1 were achieved. The results indicate that the proposed method made it possible to carry out the glycolysis of the polyester cord of the tire more deeply than the known heterogeneous glycolysis with various agents, but further research is needed for industrial implementation.

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Section: Glycolysismentioning

confidence: 99%

Section: Synthesis Of Glycolytic Agentsmentioning

confidence: 99%

Section: Synthesis Of Glycolytic Agentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of Polyester Tire Cord Glycolysis Accompanied by Rubber Crumb Devulcanization

et al. 2022

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Obtaining phthalate substituted post-consumer polyethylene terephthalate and its isothermal crystallization

Kirshanov

Gervald

Томс

et al. 2022

Fine Chem. Technol.

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Objects. Due to the polymer waste accumulation, the search for new directions for their utilization is urgent. Chemical recycling methods are of considerable interest, which allow one to obtain the original monomers or change the compositions of the copolymers. From the point of view of building a circular economy, a promising material is polyethylene terephthalate (PET), on the basis of which amorphous copolyesters can be obtained. The study aimed to analyze the simultaneous glycolysis and interchain exchange reactions of PET in the presence of the oligoethylene phthalate modifier with hydroxyl end groups and the study of isothermal crystallization of poly(ethylene phthalate-co-terephthalates) with different phthalate contents obtained in this way.Methods. Oligoethylene phthalate is synthesized by polycondensation. Poly(ethylene phthalateco-terephthalates) were obtained by the interaction of post-consumer PET with oligoethylene phthalate. The composition of the oligomer and copolymers was confirmed using Fourier-transform infrared spectroscopy, thermal characteristics and crystallization half-times were determined by differential scanning calorimetry.Results. In this work, the use of the post-consumer PET chemical recycling process, aimed at obtaining copolyesters under the influence of small modifier amounts was proposed. The process consisted in carrying out the combined interchain exchange and degradation with a complex oligoester different from PET. Poly(ethylene phthalate-co-terephthalate) copolymers were obtained via reaction of post-consumer poly(ethylene terephthalate) flakes and synthesized oligoethylene phthalate resin in the melt phase in the absence of catalyst. The effect of phthalate concentration in polymer on the isothermal crystallization of phthalate substituted poly(ethylene terephthalate) was estimated.Conclusions. The hypothesis about the possibility of using an oligoester modifier to obtain the PET-based copolymer at the high rate and without reducing the molecular weight to values characteristic of a monomer or oligomer has been confirmed. The process can be used to obtain random copolyesters based on post-consumer PET. The phthalate unit concentration increase is followed by decrease in the glass transition temperature, temperature and heat of fusion, and increase in crystallization half-times. Phthalate has a better ability to retard PET crystallization than 2-methyl-1,3-propanediol or furandicarboxylic acid, but is inferior to some of the other modifiers known.

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Recent Developments and Perspectives of Recycled Poly(ethylene terephthalate)-Based Membranes: A Review

et al. 2022

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Post-consumer poly(ethylene terephthalate) (PET) waste disposal is an important task of modern industry, and the development of new PET-based value added products and methods for their production is one of the ways to solve it. Membranes for various purposes, in this regard are such products. The aim of the review, on the one hand, is to systematize the known methods of processing PET and copolyesters, highlighting their advantages and disadvantages and, on the other hand, to show what valuable membrane products could be obtained, and in what areas of the economy they can be used. Among the various approaches to the processing of PET waste, we single out chemical methods as having the greatest promise. They are divided into two large categories: (1) aimed at obtaining polyethylene terephthalate, similar in properties to the primary one, and (2) aimed at obtaining copolyesters. It is shown that among the former, glycolysis has the greatest potential, and among the latter, destruction followed by copolycondensation and interchain exchange with other polyesters, have the greatest prospects. Next, the key technologies for obtaining membranes, based on polyethylene terephthalate and copolyesters are considered: (1) ion track technology, (2) electrospinning, and (3) non-solvent induced phase separation. The methods for the additional modification of membranes to impart hydrophobicity, hydrophilicity, selective transmission of various substances, and other properties are also given. In each case, examples of the use are considered, including gas purification, water filtration, medical and food industry use, analytical and others. Promising directions for further research are highlighted, both in obtaining recycled PET-based materials, and in post-processing and modification methods.

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Study of polyethylene terephthalate glycolysis with a mixture of bis(2-hydroxyethyl) terephthalate and its oligomers

Cited by 6 publications

References 8 publications

Investigation of Polyester Tire Cord Glycolysis Accompanied by Rubber Crumb Devulcanization

Investigation of Polyester Tire Cord Glycolysis Accompanied by Rubber Crumb Devulcanization

Obtaining phthalate substituted post-consumer polyethylene terephthalate and its isothermal crystallization

Recent Developments and Perspectives of Recycled Poly(ethylene terephthalate)-Based Membranes: A Review

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