文献类型：期刊文献

中文题名：超临界甲醇降解聚碳酸酯的动力学

英文题名：DEGRADATION KINETICS OF POLYCARBONATE IN SUPERCRITICAL METHANOL

作者：陈磊[1];吴勇强[1];倪燕慧[1];黄科[1];朱子彬[1]

机构：[1]华东理工大学化工工艺研究所,上海200237

年份：2004

卷号：55

期号：11

起止页码：1787

中文期刊名：化工学报

外文期刊名：CIESC Journal

收录：CSTPCD;;EI(收录号：2005058821421);Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金资助项目 (No 2 0 0 760 13 )~~

语种：中文

中文关键词：聚碳酸酯;超临界甲醇;动力学;醇解;回收

外文关键词：Activation energy;Degradation;Depolymerization;Gas chromatography;Infrared spectrometers;Mass spectrometers;Mathematical models;Methanol;Molecular weight;Reaction kinetics;Recycling;Size exclusion chromatography

摘要：用高压间歇反应器研究了聚碳酸酯 (PC)在 2 30～ 2 6 5℃、 7 76～ 9 96MPa条件下的降解特性 .通过红外光谱 (IR)、体积排阻色谱 (SEC)和气相色谱 /质谱 (GC/MS)对降解产物进行了定性和定量分析 ,提出了PC在超临界甲醇中的降解机理 ,同时运用连续分布动力学对PC降解历程进行了研究 ,随机断裂降解反应的活化能为 75 72kJ·mol-1.
Depolymerization of polycarbonate (PC) in supercritical methanol was studied to develop a chemical process for waste plastics recycling. Degradation experiments were carried out in a batch-type autoclave at 230-265°C, 7.76-9.96 MPa without any catalyst. Reaction products were analyzed by infrared spectrometer (IR), size exclusion chromatography (SEC) and gas chromatography/mass spectrometer (GC/MS). The number average molecular mass (Mn) of around 27700 for the original PC decreased to 1600 at 245°C within 15 min, meanwhile monomers of PC, dimethyl carbonate (DMC) and bisphenol (A), and byproducts yielded in supercritical methanol. Percent conversion of PC and the yield of monomers and byproducts were measured; and a mechanism of methanolysis was proposed. A mathematical model based on the continuous distribution kinetics for random degradation process and secondary reactions for monomer components can be used to interpret the results. The activity energy obtained was 75.72 kJ·mol-1 for the random degradation.