Chemical recycling of poly(ethylene terephthalate) waste using ethanolamine. Sorting of the end products

Tawfik, Magda E.; Eskander, S.B.

doi:10.1016/j.polymdegradstab.2009.11.026

Cited by 88 publications

(41 citation statements)

References 13 publications

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“…Aminolysis and ammonolyis were developed, since the reactivity of the amine-group is higher than the hydroxyl-group in glycols or alcohols used in glycolysis or alcoholysis of PET [223,224]. Further, drawbacks of other conventional chemical recycling methods (hydrolysis, methanolysis) like high temperature and high pressure conditions were aimed of being avoided by aminolysis and ammonolysis.…”

Section: Aminolysis/ammonolysismentioning

confidence: 99%

“…The chemicals such as alkyl amines or liquid ammonia are used in excess for PET de-polymerization (Table 4). Aminolysis and ammonolysis mainly yielded the corresponding monomeric amides of terephthalic acid [223,[226][227][228][229][230][231][232][233][234]. The de-polymerization agent, which was mainly applied, was ethanol amine (EA, Table 4).…”

Section: Aminolysis/ammonolysismentioning

confidence: 99%

“…The de-polymerization agent, which was mainly applied, was ethanol amine (EA, Table 4). EA was used to synthesize the bi-functional monomer bis(2-hydroxyl-ethylene) terephthalamide (BHETPA) in yields between 62 to 91% for further polymer syntheses (Table 4) [223,224,230,232]. Further, but less used chemicals for aminolysis or ammonolysis of PET are methyl amine (MA), liquor ammonia (NH 3 ) and ethylene diamine (EDA).…”

Section: Aminolysis/ammonolysismentioning

confidence: 99%

“…Using the catalyst, they found a higher yield for aminolysis (94%, Table 4) than for ammonolysis (38%, Table 4). Compared to the aforementioned catalysts, di-butyl tinoxide used by Tawfik and Eskander [223] was less efficient for aminolysis of PET (Table 4). All described chemical recycling methods require either high pressure apparatus (hydrolysis, methanolysis) or toxic chemicals (alkyl amines, glycols, methanol, sulfuric acid, nitric acid) to yield mainly monomers of PET.…”

Section: Aminolysis/ammonolysismentioning

confidence: 99%

See 3 more Smart Citations

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

Geyer¹,

Lorenz²,

Kandelbauer³

2016

Express Polym. Lett.

197

120

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Abstract.Recycling of poly(ethylene terephthalate) (PET) is of crucial importance, since worldwide amounts of PETwaste increase rapidly due to its widespread applications. Hence, several methods have been developed, like energetic, material, thermo-mechanical and chemical recycling of PET. Most frequently, PET-waste is incinerated for energy recovery, used as additive in concrete composites or glycolysed to yield mixtures of monomers and undefined oligomers. While energetic and thermo-mechanical recycling entail downcycling of the material, chemical recycling requires considerable amounts of chemicals and demanding processing steps entailing toxic and ecological issues. This review provides a thorough survey of PET-recycling including energetic, material, thermo-mechanical and chemical methods. It focuses on chemical methods describing important reaction parameters and yields of obtained reaction products. While most methods yield monomers, only a few yield undefined low molecular weight oligomers for impaired applications (dispersants or plasticizers). Further, the present work presents an alternative chemical recycling method of PET in comparison to existing chemical methods.

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Section: Aminolysis/ammonolysismentioning

confidence: 99%

Section: Aminolysis/ammonolysismentioning

confidence: 99%

Section: Aminolysis/ammonolysismentioning

confidence: 99%

Section: Aminolysis/ammonolysismentioning

confidence: 99%

See 2 more Smart Citations

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

Geyer¹,

Lorenz²,

Kandelbauer³

2016

Express Polym. Lett.

197

120

View full text Add to dashboard Cite

show abstract

“…Therefore, there is a growing interest in recycling PET by degradation as a partial solution to the solid waste problem, PET waste degradation consists of the decomposition by chemical agents to obtain monomers and oligomers as raw materials for the syntheses of polyesters or employed as precursors for high molecular weight polyurethanes 1 , polyester 2 and other specific uses 3 . PET can be recycled by chemical depolymerization using diols, alcohols, water and even ethanolamine 4,5 and diethanolamine as depolymerizing agents 6 . Particularly, degradation by glycolysis is a process by transesterification between ester and OH groups in excess, to obtain bis(2-hydroxyethyl terephtalate) (BHET) 7 .…”

Section: Introductionmentioning

confidence: 99%

Degradation of Poly(ethyleneterephtalate) Waste to Obtain Oligomers Using a Zinc Complex as Catalyst

Ovalle-Sánchez

Elizondo-Martínez

Pérez-Rodríguez

et al. 2017

J. Chil. Chem. Soc.

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Thermal degradation of Poly(ethylene terephthalate) (PET) bottles waste was carried out by glycolysis using triethyleneglycol (TEG) as nucleophilic agent and N 1 ,N 2 -bis(2-aminobenzyl)-1,2-diaminoethane zinc(II) (ABEN), in order to test this compound as catalyst in the degradation of PET until to obtain short chains of polyester (oligomers). The depolymerization processes was tested at 180, 190 and 210 °C, and two molar ratios of PET:TEG (1:1.3 and 1:2.6), the amount of catalyst used was fixed at 1% in relation to PET, the best experiment of PET glycolysis was found at 190 °C during two hours in a mass relation PET:TEG 1:1.3. All products were analyzed by Fourier transform infrared spectroscopy (IR), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC), the behavior of the reaction rate was studied for the best experiment by measuring the amount of degraded PET at different glycolysis time. The degradation of PET was favored with the use of ABEN, which accelerates the reaction, obtaining oligomers in the absence of an organic solvent or reaction medium, this is the most efficient catalyst found so far. The oligomers were obtained with molecular weight between 900 and 1500 g mol -1 depending on the reaction time, 60 min was the less time of the total glycolysis of PET. Also was found that the molecular weight of the oligomers increased along the glycolysis, due to the recombination with TEG and ethylene glycol produced in degradation.

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Recycling

2020

The Chemistry of Environmental Engineering

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Chemical recycling of poly(ethylene terephthalate) waste using ethanolamine. Sorting of the end products

Cited by 88 publications

References 13 publications

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

Degradation of Poly(ethyleneterephtalate) Waste to Obtain Oligomers Using a Zinc Complex as Catalyst

Recycling

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