Study on methanolytic depolymerization of PET with supercritical methanol for chemical recycling

Yang, Yong; Lu, Yao; Xiang, Huimin; Xu, Yuanyuan; Li, Yongwang

doi:10.1016/s0141-3910(01)00217-8

Cited by 188 publications

(84 citation statements)

References 21 publications

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“…The use of supercritical conditions has been explored earlier in PET hydrolysis (Sato et al, 2006) and methanolysis (Minoru et al, 2005;Yang et al, 2002), but only recently for glycolysis (Imran, et al, 2010). The main advantage of the use of supercritical fluids in a reaction is the elimination of the need of catalysts, which are difficult to separate from the reaction products.…”

Section: Supercritical Glycolysismentioning

confidence: 99%

Recent Developments in the Chemical Recycling of PET

Bartolome¹,

Imran²,

Cho³

et al. 2012

Material Recycling - Trends and Perspectives

121

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Section: Supercritical Glycolysismentioning

confidence: 99%

Recent Developments in the Chemical Recycling of PET

Bartolome¹,

Imran²,

Cho³

et al. 2012

Material Recycling - Trends and Perspectives

121

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“…Yang, Y. and co-workers reported that the optimal depolymerization conditions refers to the temperature between 260 and 270 • C, the pressure of 9.0-11.0 MPa and the weight ratio (methanol to PET) from 6 to 8 [53]. After the main products are obtained, the DMT is purified by distillation to remove all of the physical contaminants and then it can be reused to produce PET [41,54].…”

Section: Feedstock or Chemical Recyclingmentioning

confidence: 99%

Methods of Recycling, Properties and Applications of Recycled Thermoplastic Polymers

2017

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This study aims to provide an updated survey of the main thermoplastic polymers in order to obtain recyclable materials for various industrial and indoor applications. The synthesis approach significantly impacts the properties of such materials and these properties in turn have a significant impact on their applications. Due to the ideal properties of the thermoplastic polymers such as corrosion resistance, low density or user-friendly design, the production of plastics has increased markedly over the last 60 years, becoming more used than aluminum or other metals. Also, recycling is one of the most important actions currently available to reduce these impacts and represents one of the most dynamic areas in the plastics industry today.

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“…Generally, PET is de-polymerized with an excess of methanol at 160-350°C (Table 2) to yield the monomer dimethyl terephthalate (DMTP). To increase the yield of DMTP and to shorten reaction times high pressures (9-200 bar, Table 2) are applied [141][142][143][144][145][146][147][148]. Genta and coworkers [141,142] studied the effect of supercritical methanol compared to vapor methanol for PET de-polymerization.…”

Section: Alcoholysismentioning

confidence: 99%

“…Beside terephthalic acid monomethyl ester (TAMME), MHET and BHET, they obtained DMTP as main product in yields of 80%. Likewise, Yang et al [148] studied the effect of reaction temperature and time during supercritical methanolysis of PET (Table 2). Excess methanol was used for PET de-polymerization.…”

Section: Alcoholysismentioning

confidence: 99%

“…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. In case of glycolysis precise process control is of crucial importance either to prevent re-polymerization or other side-reactions [8,9,148,153,226].…”

Section: Aminolysis/ammonolysismentioning

confidence: 99%

See 1 more Smart Citation

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

Geyer¹,

Lorenz²,

Kandelbauer³

2016

Express Polym. Lett.

207

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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Study on methanolytic depolymerization of PET with supercritical methanol for chemical recycling

Cited by 188 publications

References 21 publications

Recent Developments in the Chemical Recycling of PET

Recent Developments in the Chemical Recycling of PET

Methods of Recycling, Properties and Applications of Recycled Thermoplastic Polymers

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

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