高校化学工程学报2011，Vol.25Issue(5)：904-910,7.
超/亚临界水中聚对苯二甲酸乙二醇酯的解聚
Depolymerization of Polyethylene Terephthalate in Sub-and Supercritical Water
摘要
Abstract
Depolymerization of polyethylene terephthalate (PET) in sub- and supercritical water was carried out in a batch autoclave. The influences of experimental parameters, such as reaction time, reaction temperature and the ratio of water to PET, on the depolymerization ratio and the yield of TPA (terephthalic acid) and EG (ethylene glycol) were investigated. The HPLC, FT-IR, GC and GC-MS were used to analyze the solid product (TPA) and liquid product (EG), respectively. It was found that the depolymerization temperature and time are two critical factors for the depolymerization process, and the PET could be effectively depolymerized under the temperature of 220-400X2, pressure of 2.2-31.5 Mpa and reaction time of 5-90 min. The optimal PET depolymerization conditions found are temperature of 320℃, reaction time of 15 min and the ratio (water to . PET) of 8. Under these conditions, PET could be depolymerized totally and the yields of TPA and EG could reach 93.23% and 39.90%, respectively. In addition, a reaction mechanism of the hydrolysis of PET was proposed, and the kinetic analysis shows that the depolymerization reaction in sub- and supercritical water is a first-order reaction and its activation energy is 90.47 kJ·mol-1. The obtained results could enforce the basic knowledge of selecting PET depolymerization medium and the technological parameters for PET depolymerization.关键词
超/亚临界水/解聚/聚对苯二甲酸乙二醇酯/对苯二甲酸/乙二醇Key words
sub- and supercritical water/ depolymerization/ polyethylene terephthalate/ terephthalic acid/ ethylene glycol分类
资源环境引用本文复制引用
王媚娴,潘志彦,戴娟娟,林春绵..超/亚临界水中聚对苯二甲酸乙二醇酯的解聚[J].高校化学工程学报,2011,25(5):904-910,7.基金项目
国家自然科学基金资助项目(20677052,20777070). （20677052,20777070）
