Post Consumer Pet Depolymerization by Acid Hydrolysis

Mancini, Sandro Donnini; Zanin, M.

doi:10.1080/03602550601152945

Cited by 70 publications

(66 citation statements)

References 18 publications

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“…This value is in fairly good agreement with 69 kJ mol -1 reported by Wan et al [9] for the alkaline depolymerisation with potassium hydroxide. Further, this activation energy value was quite lower than the corresponding value observed for acid hydrolysis, 100-110 kJ mol -1 [10,11]. The pre-exponential factor calculated from the intercept was 1.3±0.7⋅10…”

Section: Non-catalysed Alkaline Hydrolysis Of Petmentioning

confidence: 83%

“…Within the context of alkaline hydrolysis of PET a potentially active PTC should efficiently transport the hydroxide anion from the aqueous phase to the organic phase (solid PET), thereby increasing the reaction rate. Recent studies have only evaluated the role of quaternary ammonium salts [ 1 [2][3][4][5][6][7][8][9][10][11][12][13][14]; however, no attention has been paid to examining the behaviour of tetralkyl phosphonium salts as PTCs (table 1) for this specific reaction system. For this screening study the following operating conditions were used: stirring rate 400 rpm, particle size 250 µm, inert atmosphere 200 kPa N 2 , temperature 80 ºC, NaOH concentration 1.67 mol l -1 , PET concentration 0.29 mol l -1 , and PTC concentration 0.07 mol l -1 .…”

Section: Alkaline Hydrolysis Of Pet Assisted By Phase Transfer Catalystsmentioning

confidence: 99%

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Chemical recycling of PET by alkaline hydrolysis in the presence of quaternary phosphonium and ammonium salts as phase transfer catalysts

López‐Fonseca

González-Marcos

González‐Velasco

et al. 2008

WIT Transactions on Ecology and the Environment

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Chemical or tertiary recycling of waste polymers including PET, poly(ethylene terephthalate), is the only method according to the principles of Sustainable Development, since it leads to the formation of the raw materials (monomers) from which the polymer is made of. This work has been focused on the determination of the kinetics of the depolymerisation of PET by means of alkaline hydrolysis and on the identification of the catalytic behaviour, if any, of a series of phosphonium and ammonium salts as phase transfer catalysts (9 salts with varying alkyl groups, central cation (N or P) and anion (Cl -, Br -, I -, OH -)). Among the catalysts tested tributylhexadecylphosphonium bromide (3Bu6DPB) is found to be the most effective catalyst. Complete conversion of PET with considerably low catalyst concentration and temperature can be achieved. The selected phase transfer catalyst fulfils the requirements of having enough character in order to be lipophilic, while small enough in order to avoid steric hindrance. The time for complete hydrolysis (>90% conversion) of solid PET under alkaline conditions with 3Bu6DPB at 80 ºC is 1.5 hours and 10 hours without 3Bu6DPB.

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Section: Non-catalysed Alkaline Hydrolysis Of Petmentioning

confidence: 83%

Section: Alkaline Hydrolysis Of Pet Assisted By Phase Transfer Catalystsmentioning

confidence: 99%

Chemical recycling of PET by alkaline hydrolysis in the presence of quaternary phosphonium and ammonium salts as phase transfer catalysts

López‐Fonseca

González-Marcos

González‐Velasco

et al. 2008

WIT Transactions on Ecology and the Environment

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“…3 However, the only method acceptable according to the principles of sustainable development is the so-called tertiary or chemical recycling, since it results in the yield of the corresponding monomers. The chemical recycling of PET can be conducted by the following techniques: (i) glycolysis, 4,5 (ii) methanolysis, 6,7 (iii) hydrolysis 8,9 and (iv) aminolysis 10,11 or ammonolysis. 12 All these methods have been reviewed recently by Paszun and Spychaj, 13 Karayannidis and Achilias 14 and Lorenzetti et al 15 These processes are solvolitic reactions which, through ester bond cleavage, give various depolymerised products.…”

Section: Introductionmentioning

confidence: 99%

A kinetic study of the depolymerisation of poly(ethylene terephthalate) by phase transfer catalysed alkaline hydrolysis

López‐Fonseca

González-Marcos

González‐Velasco

et al. 2008

J of Chemical Tech & Biotech

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BACKGROUND: Chemical or tertiary recycling of waste polymers including PET, poly(ethylene terephthalate), leads to the formation of raw starting monomers by different depolymerisation routes. This work was focused on the identification of the catalytic behaviour, if any, of a series of quaternary phosphonium and ammonium salts as phase transfer catalysts for the alkaline hydrolysis of PET, and on the determination of the kinetics of the phase transfer catalysed process.

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“…The PET monomers can be obtained by acidic, neutral, and alkaline hydrolysis or glycolysis. TPA and EG can be obtained by hydrolysis under neutral [12][13][14], acidic [8,[15][16][17], or alkaline [18][19][20][21][22] conditions and BHET by glycolysis [23][24][25] of waste PET.…”

Section: Introductionmentioning

confidence: 99%

The use of aminolysis, aminoglycolysis, and simultaneous aminolysis–hydrolysis products of waste PET for production of paint binder

Bulak

Acar

2013

Polymer Engineering & Sci

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TurkeyThis work is concerned with the use of aminolysis, aminoglycolysis, and simultaneous aminolysis-hydrolysis products of waste PET for production of paint binder based on alkyd resin. For this purpose, first, aminolysis, aminoglycolysis, and simultaneous hydrolysis-aminolysis reactions of waste PET were carried out in the presence of different chemical agents in xylene medium at high pressures. Reactions of waste PET flakes obtained from grinding postconsumer water bottles were carried out in an autoclave at higher temperatures. Then, four alkyd resins, formulated to have oil content 40-50%, were prepared using these depolymerization products. One of resins is "reference alkyd resin" which was prepared by using soybean oil fatty acid, phthalic anhydride, glycerine, and ethylene glycol for comparison. Other three alkyds are "depolymerization productbased alkyd resins" in which depolymerization products is used instead of ethylene glycol. Then, the physical and chemical surface coating properties and thermal behaviors of alkyd resins films were investigated comparatively. As a result, we concluded that aminolysis, aminoglycolysis, and simultaneous aminolysis-hydrolysis products of waste PET are suitable for manufacturing both air drying and oven curing paint binder based on alkyd resins. The film prepared from alkyd resin based on simultaneous aminolysis-hydrolysis product showed extremely good surface coating properties and thermal stability. POLYM. ENG. SCI., 54:2272-2281, 2014

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Post Consumer Pet Depolymerization by Acid Hydrolysis

Cited by 70 publications

References 18 publications

Chemical recycling of PET by alkaline hydrolysis in the presence of quaternary phosphonium and ammonium salts as phase transfer catalysts

Chemical recycling of PET by alkaline hydrolysis in the presence of quaternary phosphonium and ammonium salts as phase transfer catalysts

A kinetic study of the depolymerisation of poly(ethylene terephthalate) by phase transfer catalysed alkaline hydrolysis

The use of aminolysis, aminoglycolysis, and simultaneous aminolysis–hydrolysis products of waste PET for production of paint binder

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