2023
DOI: 10.1021/acs.iecr.3c03422
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Chemical Recycling Development of Poly(ethylene terephthalate) by Glycolysis and Cooling Crystallization with Water

Tu Lee,
Yu-Kun Peng,
Hung Lin Lee
et al.

Abstract: A systematic study was carried out to develop the cooling crystallization of bis(2-hydroxyethyl) terephthalate (BHET) from 65 to 25 °C with various cooling rates (5 and 80 °C/h) and volumes of water added (60, 120, and 240 mL) after fixing the glycolysis conditions for 10 g clear poly(ethylene terephthalate) (PET) in 60 mL of ethylene glycol (EG) (T = 185 °C, t = 2 h, and catalyst = 0.111 g Na2CO3). The glycolysis of PET gave the actual conversion, crystal yield, and purity of BHET monomers of 93.0 ± 0.7, 70.3… Show more

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“…The solutions were heated to 70 °C and thoroughly stirred to ensure complete dissolution of l -histidine and the additives. Cooling was subsequently conducted at a rate of 1 °C/min ,,,, until the first crystals were detected by a laser monitoring device, , at which point the temperature was maintained for 5–30 min to obtain a sufficient amount of crystals (the temperature at which the crystals appeared in each experiment can be found in Supporting Information S1). Crystals in all the experiments are known to appear at temperatures below 35 °C.…”
Section: Experimental and Simulation Sectionsmentioning
confidence: 99%
“…The solutions were heated to 70 °C and thoroughly stirred to ensure complete dissolution of l -histidine and the additives. Cooling was subsequently conducted at a rate of 1 °C/min ,,,, until the first crystals were detected by a laser monitoring device, , at which point the temperature was maintained for 5–30 min to obtain a sufficient amount of crystals (the temperature at which the crystals appeared in each experiment can be found in Supporting Information S1). Crystals in all the experiments are known to appear at temperatures below 35 °C.…”
Section: Experimental and Simulation Sectionsmentioning
confidence: 99%