Chemical recycling of poly(ethylene terephthalate) (pet) by hydrolysis and glycolysis

摘要: In this paper we review an interesting method of PET recycling, i.e. chemical recycling; it is based on the concept depolymerizing condensation polymer through solvolytic chain cleavage into low molecular products which can be purified and reused as raw materials for production high-quality products. work our attention confined to hydrolysis (neutral, acid alkaline) glycolysis processes operating conditions mechanism each are reported described. The neutral has auto accelerating character; two kinetic models have been proposed: half-order a second order model. could explained by modified shrinking core model under reaction control alkaline first-order with respect hydroxide ion concentration. To describe glycolysis, different proposed where EG act or not internal catalyst. Further experimental theoretical investigations required shed light promising recycling reviewed in work.