 ISSN 0235-7216 ISSN 2424-4538 (online) |
2008 m. Nr. 2 Glycolysis of industrial poly(ethylene terephthalate) waste directed to bis(hydroxyethylene) terephthalate and aromatic
polyester polyols
Industrial PET waste was recycled by glycolysis using both 1,2-ethanediol (ethylene glycol) to obtain bis(hydroxyethylene) terephthalate (BHET) and 2,2’-oxydiethanol (diethylene glycol) in the absence or presence of glycerol and adipic acid to obtain aromatic polyester polyols (APP). A high yield (ca 82%) of high quality BHET was obtained under 3 h of reflux at 190 °C. APP with the hydroxyl number in the range 290 to 430 mg KOH/g and viscosity in the range 3000 to 38000 mPa · s were prepared. APPs synthesized in the presence of functional additives were amorphous, more viscous and much more stable against crystallization. The effect of the amount and type of the organometallic catalyst on the properties of APP was investigated. Keywords: industrial PET waste, glycolysis, aromatic polyester polyols, recycling |
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