Chemical recycling of post-consumer PET wastes by glycolysis in the presence of metal salts

Recent Developments in the Chemical Recycling of PET

“…They recently used the recovered BHET monomer to produce useful products such as softeners and hydrophobic dyes for the textile industry (Shuka et al, 2008(Shuka et al, , 2009). López-Fonseca et al also used these eco-friendly catalysts in their study of catalyzed glycolysis kinetics (López-Fonseca et al, 2010, 2011. The latest catalysts that Shukla's group developed are inexpensive and readily available metal chlorides, wherein zinc chloride reportedly gave the highest BHET yield equal to 73.24% (Pingale et al, 2010).…”

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.…”

Degradation of Poly(ethyleneterephtalate) Waste to Obtain Oligomers Using a Zinc Complex as Catalyst

“…The yields of glycolysis reactions were high in all cases, even at 180 °C, the lower temperature used in this work, taking in account some references that report 74% of degradation as maximum [18]. Increasing only 10 °C the temperature to reach 190 °C caused a 100 % of degradation in the PET, thus 190 °C and a molar ratio PET/TEG 1/1.3 (Experiment 3) are the best conditions to carry out these reactions.…”