Exploration of the process of depolymerizing waste PET bottlesusing ethylene glycol
作者：Yu Yang, Shen Guoliang, Xu Tiejun*, Wen Ruiyang
中國分類(lèi)號：TQ323.41
文獻標識碼：B
文章標識碼：1009-797X (2025) 12-0001-04
關(guān)鍵詞：waste PET; ethylene glycol; depolymerization; catalyst
摘要
PET (polyethylene terephthalate), as a thermoplastic with excellent performance, is widely used. However, due to its difficulty in decomposing in the environment, it poses a certain burden on the environment, and the recycling and reuse of PET have received more attention. This experiment studied a new type of green, environmentally friendly, and non-toxic silanol catalyst for the depolymerization of waste PET bottles using ethylene glycol to produce BHET [bis(2-hydroxyethyl) terephthalate]. The effects of reaction temperature, reaction time, and catalyst dosage on the yield of depolymerization product BHET were emphatically investigated. The results showed that at 200 ℃, with a reaction time of 3 hours and a mass ratio of ethylene glycol:PET:catalyst is 4:1:0.04, the yield of reaction product BHET could reach 84%.