Ethylene Polymerization Kinetics and Microstructure of Polyethylenes Made with Supported Metallocene Catalysts

被引:22
作者
Mehdiabadi, Saeid [1 ]
Lhost, Olivier [2 ]
Vantomme, Aurelien [2 ]
Soares, Joao B. P. [1 ]
机构
[1] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada
[2] Total Res & Technol Feluy, B-7181 Seneffe, Belgium
关键词
CHAIN BRANCHING DISTRIBUTION; OLEFIN POLYMERIZATION; ZIEGLER-NATTA; ETHYLENE/1-HEXENE COPOLYMERIZATION; POLYOLEFIN CHAINS; ACTIVE-SITES; PARTICLE; GAS; HOMOPOLYMERIZATION; LENGTH;
D O I
10.1021/acs.iecr.1c01091
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The microstructure of polyolefins made with a metallocene supported on a porous carrier is generally less homogeneous than when the polyolefin is made with the same unsupported metallocene. For instance, the molecular weight and chemical composition distributions of ethylene/1-olefin copolymers are often broader when they are made with a supported metallocene. In this article, a mathematical model is used to quantify this phenomenon. The polymerization of ethylene was investigated in parallel semi-batch reactors using a metallocene catalyst supported on an inorganic porous carrier. Ethylene pressure, polymerization temperature, and H-2 concentration were the factors changed to study ethylene polymerization kinetics with this catalyst system. Modeling results showed that a three-site model was needed to describe the molecular weight distributions of the polyethylene samples made with this catalyst.
引用
收藏
页码:9739 / 9754
页数:16
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