A Kinetic Model for Ethylene Polymerization with a Polymer Supported Ziegler-Natta Catalyst
A Kinetic Model for Ethylene Polymerization with a Polymer Supported Ziegler-Natta Catalyst
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聚合物负载齐格勒-纳塔催化剂乙烯聚合的动力学模型
DOI：
10.1080/10543414.1999.10744501
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
D. Bacon
中科院分区：
文献类型：
--
作者：
A. Shariati;C. Hsu;D. Bacon
建立了一个包含两类活性中心的聚合物负载Ziegler-Natta催化剂淤浆法乙烯聚合动力学模型，用于预测聚合反应的转化率、聚合速率和分子量。该模型包括活化的活性位点，传播，失活，链转移由氢和单体扩散通过聚合物层周围的催化剂颗粒的活性位点的效果。允许活性位点从I型转化为II型。聚合数据是在恒温、恒压下由半间歇淤浆反应器获得的。实验程序根据中心复合设计进行，其中单体分压、催化剂负载量、氢气与单体的比率、温度和催化剂粒度作为工艺变量。
ABSTRACTA kinetic model including two types of active sites was developed for the polymerization of ethylene in slurry with a polymer supported Ziegler-Natta catalyst to predict monomer conversion, polymerization rate and molecular weights. The model includes activation of active sites, propagation, deactivation, chain transfer by hydrogen and the effect of monomer diffusion through the polymer layer around the catalyst particles to the active sites. Transformation of active sites from type I to type II is allowed. The polymerization data were obtained from a semibatch slurry reactor under constant temperature and pressure. The experimental program was carried out according to a central composite design with monomer partial pressure, catalyst loading, hydrogen to monomer ratio, temperature, and catalyst particle size as process variables.