Comparative reactivity of glycols in PET glycolysis

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

“…PTC is regenerated in its added form and the PTC cycle continues. The overall reaction scheme is illustrated by Equations (4) and (5).…”

“…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.…”

Methods of Recycling, Properties and Applications of Recycled Thermoplastic Polymers

“…Also, Pardal, F. and G. Tersac reported that the reactivity order of different glycols varies according to the conditions of temperature and catalysis. The global reactivity depends on the chemical reactivity of the glycol and on its physicochemical properties such as the polarity of the reaction mixture and ability to solvate the solid polyesters [52].…”

Alcoholysis of poly(ethylene terephthalate) to produce dioctyl terephthalate with sub- and super-critical isooctyl alcohol

“…As for recent chemical recycling of waste PET such as hydrolysis [2][3][4][5], alcoholysis [6][7][8][9][10][11], amine degradation [12] and other processes [13], the alcoholysis can not only obtain some high value products such as bis(2-hydroxyethyl)terephthalate of alcoholysis with ethylene glycol (EG), but also avoid corrosion. Now it is known that a very excellent plasticizer of DOTP can be produced by alcoholysis with 2-EH, but the alcoholysis at reflux temperature is very slow and must use some catalysts such as metal acetates, titaniumphosphates, solid acids or sulfates [8,[14][15][16].…”