Kinetics of catalytic glycolysis of PET wastes with sodium carbonate
Kinetics of catalytic glycolysis of PET wastes with sodium carbonate
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DOI：
10.1016/j.cej.2011.01.031
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发表时间：
2011-03-15
影响因子：
15.1
通讯作者：
Gutierrez-Ortiz, Jose I.
中科院分区：
文献类型：
--
作者：
Lopez-Fonseca, Ruben;Duque-Ingunza, Itxaso;Gutierrez-Ortiz, Jose I.
在间歇反应器中研究了聚对苯二甲酸乙酯废物与乙二醇糖酵解制备高纯对苯二甲酸乙酯的动力学。使用过量的乙二醇（如：PET摩尔比为7.6:1），在碳酸钠作为活性催化剂的情况下进行反应。分析了温度（165-196℃）、平均粒径（0.14-3 mm）、搅拌速度（50-800 rpm）、反应时间（0-10 h）、催化剂类型和浓度等操作条件对反应性能的影响。动力学计算选择PET粒径为0.25 mm，搅拌速率为600 rpm。分别。在PET：催化剂摩尔比为100:1的条件下，在196℃下反应1 h，得到了约80%的BHET收率。建立了一个简单的理论幂律模型来预测转化的时间演变。该动力学模型与实验数据一致。估计了正反反应的速率常数。得到了反应活化能（185 kJ mol(-1)）和反应焓（12 kJ mol(-1)）。(C) 2011 Elsevier B.V.版权所有
The kinetics of glycolysis of poly(ethylene terephthalate) wastes with ethylene glycol to give highly pure bis(2-hydroxyethyl terephthalate) was examined in a batch reactor. An excess of ethylene glycol (EG:PET molar ratio of 7.6:1) was used and the reaction was carried out in the presence of sodium carbonate as active catalyst. The influence of several operating conditions covering temperature (165-196 degrees C), mean particle size (0.14-3 mm), stirring rate (50-800 rpm), reaction time (0-10 h), and catalyst type and concentration was analysed. The selected PET particle size and stirring rate for kinetic calculations were 0.25 mm and 600 rpm. respectively. Using a PET:catalyst molar ratio of 100:1 about 80% BHET yield was attained at 196 degrees C after 1 h. A simple theoretical power-law model was developed to predict the time evolution of conversion. This kinetic model was found to be consistent with experimental data. The rate constants for both direct and reverse reactions were estimated. Also the values of the activation energy (185 kJ mol(-1)) and enthalpy of reaction (12 kJ mol(-1)) were derived. (C) 2011 Elsevier B.V. All rights reserved.