Studies of glycolysis of poly(ethylene terephthalate) recycled from postconsumer soft‐drink bottles. II. Factorial experimental design

1‐Allyl‐3‐methylimidazolium halometallate ionic liquids as efficient catalysts for the glycolysis of poly(ethylene terephthalate)

“…Thus, it is concluded that the catalytic performance of the new IL catalysts used in this work is much better. At the same time, the catalysts have an advantage of energy consumption, because the degradation reaction occurred in the relative mild conditions with a higher reaction rate compared to traditional metal salt catalysts,17–23 common IL catalysts, Fe‐containing magnetic IL catalysts, and metallic acetate IL catalysts.…”

“…Many chemical methods, such as methanolysis,12 glycolysis,13 hydrolysis,14 and ammonolysis,15, 16 have been reported, and among which glycolysis has attracted more attention because of less volatile solvents and easily continuous production; moreover, the bis(hydroxyethyl) terephthalate (BHET) product obtained from glycolysis reaction can be used directly to synthesize PET products. With glycolysis method, the metal acetates (e.g., zinc acetate, manganese acetate, cobalt acetate, and lead acetate), metal chlorides, metal oxide, solid super acids, titanium phosphate, and sodium carbonate are served as catalysts with high‐degradation efficiency of PET wastes,17–23 but these catalysts require higher temperature and pressure, and the main product is difficultly separated from the catalysts. Thus, developing new catalysts that can effectively degrade the PET wastes into high‐pure monomer BHET under the relatively mild condition is significantly important.…”

Kinetics of catalytic glycolysis of PET wastes with sodium carbonate

“…Other metal salts, including metal (Co, Pb and Mn) acetates [25,[31][32][33], metal (Zn, Li, Mg and Fe) chlorides [34] or titanium phosphate [35], have been also investigated. More recently, Wang et al have reported interesting results on the PET glycolysis assisted by ionic liquids [36].…”

Degradation of poly(ethylene terephthalate) waste with dimethyl tin distanoxane as a catalyst

“…Reports have confirmed the influence of the glycolysis conditions on the conversion of PET in studies with factorial experimental design that involved glycolysis conditions with cobalt acetate as a catalyst, and the formation of Bis (2‐hydroxyethyl terephtalate) (BHET) as the main product of the degradation was found . In these reports, the sequence of the main effects on the glycolysis conversion in ascending order was Time < Temperature < Amount of catalyst.…”