Glycolysis of poly(ethylene terephthalate) catalyzed by ionic liquids

Recent Developments in the Chemical Recycling of PET

“…After this, they extended their research by investigating the reusability of the ionic liquid catalysts and kinetics of the PET degradation by ionic liquid alone. They concluded that the catalysts can be used repeatedly, that the degradation reaction is first-order with activation energy equal to 232.79 kJ/mol, and that it can potentially replace the traditional organic solvents used in PET degradation (Wang et al, 2009b). Recently, they successfully applied Fecontaining magnetic ionic liquid as a catalyst for PET glycolysis.…”

The Glycolysis of Poly(ethylene terephthalate) Waste: Lewis Acidic Ionic Liquids as High Efficient Catalysts

“…It has been reported that ionic liquids were used as solvents and/or catalysts in polymer depolymerization [11,12]. In 2009, Wang [13] found that ionic liquids could catalyze the depolymerization of PET in ethylene glycol. However, long reaction time and high dosage of a catalyst were required for high conversion of PET in the presence of 1-methyl-3-butylimidazolium chloride ([Bmim]Cl).…”

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

“…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.…”