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Kinetic and morphological study of a magnesium ethoxide‐based Ziegler–Natta catalyst for propylene polymerization |
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| Authors: | Ali Dashti Ahmad Ramazani SA Yuichi Hiraoka Sang Yull Kim Toshiaki Taniike Minoru Terano |
| Affiliation: | 1. Chemical Engineering and Petroleum Department, Sharif University of Technology, PO Box 11155/9465, Tehran, Iran;2. School of Materials Science, Japan Advanced Institute of Science and Technology, 1‐1 Asahidai, Nomi, Ishikawa 923‐1292, Japan;3. Yuki Gosei Kogyo Co., Japan;4. Samsung Total Petrochemicals Co., Korea |
| Abstract: | BACKGROUND: Kinetic and morphological aspects of slurry propylene polymerization using a MgCl2‐supported Ziegler–Natta catalyst synthesized from a Mg(OEt)2 precursor are investigated in comparison with a ball‐milled Ziegler–Natta catalyst. RESULTS: The two types of catalyst show completely different polymerization profiles: mild activation and long‐standing activity with good replication of the catalyst particles for the Mg(OEt)2‐based catalyst, and rapid activation and deactivation with severe fragmentation of the catalyst particles for the ball‐milled catalyst. The observed differences are discussed in relation to spatial distribution of TiCl4 on the outermost part and inside of the catalyst particles. CONCLUSION: The Mg(OEt)2‐based Ziegler–Natta catalyst is believed to show highly stable polymerization activity and good replication because of the uniform titanium distribution all over the catalyst particles. Copyright © 2008 Society of Chemical Industry |
| Keywords: | Ziegler– Natta propylene polymerization kinetics morphology Mg(OEt)2‐based catalyst |