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首页> 外文期刊>Journal of Applied Polymer Science >Kinetic Study of Olefin Polymerization witha Supported Metallocene Catalyst.I.Ethylene/Propylene Copolymerization in Gas Phase
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Kinetic Study of Olefin Polymerization witha Supported Metallocene Catalyst.I.Ethylene/Propylene Copolymerization in Gas Phase

机译：负载型茂金属催化剂催化烯烃聚合的动力学研究I.气相中的乙烯/丙烯共聚合

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摘要

Akinetic study of ethylene homopolymerization and copolymerization is conducted with a supported metallocene catalyst in a gas-phase reactor. An experimen- tal procedure is developed that minimizes the effect of impurities in the reactor and simultaneously yields consistent and reproducible reaction-rate data. The effects of operational parameters such as reaction temperature, pressure, and comonomer con- centration on the kinetics ofbothhomopolymerization and copolymerization are inves- tigated. Online perturbation techniques are implemented to determine key kinetic parameters such as the activation energies for ethylene propagation and catalyst deactivation. A reaction-rateorder close to 2 is obtained for ethylene homopolymeriza- tion from pressure perturbations, while near to first-orderdependency is observed in th~ presence of propylene. To quantify the effects of the operational parameters, a one-site kinetic model forhomopolymerization and a two-site kinetic model for copoly- merization are proposed. The necessary kinetic parameters in the model are estimated using the POL YREDTM package. The resulting kinetic mod~l represents the kinetic data over a wide range ofconditionsforthissupported metallocene catalyst.
机译：在气相反应器中用负载的茂金属催化剂进行乙烯均聚和共聚的动力学研究。开发了一种实验程序，该程序可以最大程度地减少反应器中杂质的影响，同时获得一致且可重复的反应速率数据。研究了反应温度，压力和共聚单体浓度等操作参数对均聚和共聚动力学的影响。实施在线扰动技术来确定关键动力学参数，例如用于乙烯扩散和催化剂失活的活化能。对于乙烯均聚而言，由于压力扰动，反应速率接近2，而在丙烯的存在下，反应速率接近1阶。为了量化操作参数的影响，提出了用于均聚的一点动力学模型和用于共聚的两点动力学模型。使用POL YREDTM软件包估算模型中必要的动力学参数。所得的动力学模型代表了该负载的茂金属催化剂在宽范围条件下的动力学数据。

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