文献类型：期刊文献

中文题名：聚对苯二甲酸乙二醇酯在超临界甲醇中解聚的研究

英文题名：Depolymerization of Polyethylene Terephthalate in Supercritical Methanol

作者：陈磊[1];吴勇强[1];倪燕慧[1];朱子彬[1]

机构：[1]华东理工大学化工工艺所,上海200237

年份：2004

卷号：18

期号：5

起止页码：585

中文期刊名：高校化学工程学报

外文期刊名：Journal of Chemical Engineering of Chinese Universities

收录：CSTPCD;;EI(收录号：2004538760415);Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金 (20076013)。

语种：中文

中文关键词：聚对苯二甲酸乙二醇酯;甲醇;超临界;解聚;动力学

外文关键词：Autoclaves;Depolymerization;Methanol;Reaction kinetics;Scanning electron microscopy

摘要：在间歇高压反应器中研究了聚对苯二甲酸乙二醇酯(PET)在超临界甲醇中的解聚反应特性, 通过扫描电镜观测了不同解聚条件下固相聚合物的内部结构,提出了解聚反应历程并得到了不同解聚条件下反应表观活化能。在甲醇的非临界区域,PET在甲醇中表现为溶胀过程,解聚程度低,反应在聚合物表面进行,反应表观活化能为27.19kJmol-1,解聚过程为传质、扩散控制;在甲醇的临界区域, PET完全溶于甲醇,解聚反应在均相中进行,反应表观活化能为89.79kJmol-1,为化学反应控制。
Depolymerization of polyethylene terephthalate (PET) in supercritical methanol was carried out by using a batch autoclave reactor. Internal structure of depolymerized PET obtained under different decomposition conditions was detected by scanning electron microscope (SEM). The depolymerization mechanism was proposed. In the sub-critical region of methanol, the depolymerization reaction primarily occurs on the surface of PET, which mainly shows a swelling process with the total depolymerization rate of PET less than 20% within 60 min at 200°C. In the super critical region of methanol, the depolymerization reaction occurs out in homogeneous phase, and PET solves quickly with the total depolymerization rate of PET increasing observably to 85.42% within 20 min at 265°C. A kinetic model to describe the depolymerization of PET was proposed, where the reaction activity energy was evaluated to be 89.79 kJ·mol-1 and 27.19 kJ·mol-1 in super critical and sub-critical methanol respectively. The controlling process of depolymerization changes from mass transfer and scatter process in sub-critical methanol to chemical reaction in supercritical methanol.