Manganese-, cobalt-, and zinc-based mixed-oxide spinels as novel catalysts for the chemical recycling of poly(ethylene terephthalate) via glycolysis

Imran, Muhammad; Kim, Do Hyun; Al-Masry, Waheed A.; Mahmood, Asif; Hassan, Azman; Haider, Sajjad; Ramay, Shahid M.

doi:10.1016/j.polymdegradstab.2013.01.007

Cited by 227 publications

(159 citation statements)

References 39 publications

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“…Figure 4 shows the DSC curves of the main product of glycolysis from virgin ( Figure 4a) and post-consumer PET (Figure 4b), which has an endothermic peak located at 110°C corresponding to the melting point of BHET 10 . Moreover, there are not observed peaks corresponding to dimers and/ or oligomers (~170°C) 31 and unreacted residual PET (255- 265°C) 32 , indicating that both catalysts were efficient in virgin and post-consumer PET glycolysis.…”

Section: Bhet Characterizationmentioning

confidence: 96%

Titanate Nanotubes as New Nanostrutured Catalyst for Depolymerization of PET by Glycolysis Reaction

et al. 2017

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The final destination of PET packaging is creating economic and environmental concerns. One of the alternatives to minimize this problem would be making use of chemical recycling of this material through glycolysis with the aim to produce bis(hydroxiethyl) terephthalate, BHET monomer. This reaction is well known, but it still presents problems as BHET purity since it makes necessary the development of new catalysts highly selective. In this context, the present work studied the catalytic activity of a nanostructured material, titanate nanotubes (TNT), and compared it to a commercial catalyst (zinc acetate), which is the most used for this glycolysis reaction according to literature researches, and analyzed the influence of PET type (virgin and post-consumer) in the depolymerization for reaction times of 2, 3 and 4 hours. Using TNT as catalyst, BHET production yield and values of turnover number for the evaluated reaction times were higher than the results using Zn(OAc) 2 for virgin PET, proving itself as a promising catalyst.

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Section: Bhet Characterizationmentioning

confidence: 96%

Titanate Nanotubes as New Nanostrutured Catalyst for Depolymerization of PET by Glycolysis Reaction

et al. 2017

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“…For example, saturated and unsaturated polyesters [10][11][12], polyurethanes [13][14][15], coating materials [16][17][18][19] and additives [20][21][22] have been synthesized from such building blocks in recent years. A large number of reagents have been used for glycolysis of PET such as ethylene glycol [23][24][25][26], diethylene glycol [27,28], propylene glycol [29], neopentyl glycol [14], 1,4-butanediol [30,31], and some synthetic oligoesters [32,33]. To the best of our knowledge, no one has ever been used BHET as diol for the PET glycolysis.…”

mentioning

confidence: 99%

Chemical recycling of poly(ethylene terephthalate). Application to the synthesis of multiblock copolyesters

Mejjatti¹,

Harit²,

Riahi³

et al. 2014

Express Polym. Lett.

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“…Al-Sabagh et al [195] and Alnaqbi et al [214] applied ionic liquids (1-butyl-3-methylimidazolium bromide or 1-butyl-3-methylimidazolium acetate as co-catalyst) for complete glycolysis of PET. Further, Fukushima and coworkers [198,201] [11,187,200,210,221]. In addition, glycolysis leads to the formation of undesired cyclic oligomers [128].…”

Section: Glycolysismentioning

confidence: 99%

“…Since life cycle assessment studies showed that re-utilization of PET has a positive effect on energy balance and the reduction of CO 2 emissions, for ecological reasons, the need of an appropriate PET-recycling is greater than ever [3][4][5][6][7]. Thus, several PET-recycling methods have been developed, which were partially reviewed in the literature [8][9][10][11][12][13][14][15]. One of these methods is the incineration of the PETwaste using the released heat of combustion (direct energy recovery), which amounts to about 46 MJ·kg -1 [13,14].…”

Section: Introductionmentioning

confidence: 99%

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

Geyer¹,

Lorenz²,

Kandelbauer³

2016

Express Polym. Lett.

206

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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Manganese-, cobalt-, and zinc-based mixed-oxide spinels as novel catalysts for the chemical recycling of poly(ethylene terephthalate) via glycolysis

Cited by 227 publications

References 39 publications

Titanate Nanotubes as New Nanostrutured Catalyst for Depolymerization of PET by Glycolysis Reaction

Titanate Nanotubes as New Nanostrutured Catalyst for Depolymerization of PET by Glycolysis Reaction

Chemical recycling of poly(ethylene terephthalate). Application to the synthesis of multiblock copolyesters

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

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