文献类型：期刊文献

中文题名：超临界甲醇降解对苯二甲酸丁二酯的研究

英文题名：DEPOLYMERIZATION OF POLYBUTYLENE TEREPHTHALATE IN SUPERCRITICAL METHANOL

作者：黄婕[1];齐文杰[1];吴勇强[1];朱子彬[1]

机构：[1]华东理工大学化学工艺研究所,上海200237

年份：2005

卷号：15

期号：2

起止页码：309

中文期刊名：高分子学报

外文期刊名：Acta Polymerica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金 (基金号 2 0 0 760 13 )资助项目

语种：中文

中文关键词：对苯二甲酸;丁二酯;超临界甲醇;降解;工程塑料;综合性能;电子电气;全球范围;需求量;合金

外文关键词：supercritical fluid; depolymerization; polybutylene terephthalate; dissolution

摘要：Depolymerization of polybutylene terephthalate (PBT) in supercritical methanol was studied using a stainless stirred batch\|type autoclave under high temperature (453～533?K) and high pressure (7～12?MPa) conditions.The main depolymerization products were dimethyl terephthalate (DMT) monomer and ethylene glycol.The effects of different reaction temperature and pressure on depolymerization of PBT were investigated by analysis of the solid phase and liquid phase products.Considering the critical point of methanol (512 6?K,8 09?MPa),the reaction pressure was varied with in the range of 7～12?MPa.The results showed that the reaction pressure had little influence on the depolymerization and the depolymerization rate was affected greatly by the reaction temperature.The depolymerization of PBT was only 30% in 40?min at lower temperatures (453～463?K) but reached 100% in 20?min when the temperature was above 513?K.Depolymerization kinetics of polybutylene terephthalate in supercritical methanol was studied.The results showed that the depolymerization reaction rate constant ( k 1) in the temperature range of 513～533?K was much larger than the rate constant ( k 2) in the range of 453～483?K.The dissolution characteristics of PBT in supercritical methanol were the critical factors for depolymerization of PBT in a short time.These findings suggest that the supercritical methanol treatment for depolymerization of polymers such as PBT will be potential for obtaining useful chemicals.
Depolymerization of polybutylene terephthalate (PBT) in supercritical methanol was studied using a stainless stirred batch-type autoclave under high temperature (453 similar to 533 K) and high pressure (7 similar to 12 MPa) conditions. The main depolymerization products were dimethyl terephthalate (DMT) monomer and ethylene glycol. The effects of different reaction temperature and pressure on depolymerization of PBT were investigated by analysis of the solid phase and liquid phase products. Considering the critical point of methanol (512.6 K, 8.09 MPa), the reaction pressure was varied with in the range of 7 - 12 MPa. The results showed that the reaction pressure had little influence on the depolymerization and the depolymerization rate was affected greatly by the reaction temperature. The depolymerization of PBT was only 30% in 40 min at lower temperatures (453 similar to 463 K) but reached 100% in 20 min when the temperature was above 513 K. Depolymerization kinetics of polybutylene terephthalate in supercritical methanol was studied. The result's showed that the depolymerization reaction rate constant (k(1)) in the temperature range of 513 - 533 K was much larger than the rate constant (k(2)) in the range of 453 483 K. The dissolution characteristics of PBT in supercritical methanol were the critical factors for depolymerization of PBT in a short time. These findings suggest that the supercritical methanol treatment for depolymerization of polymers such as PBT will be potential for obtaining useful chemicals.