✦ LIBER ✦

Temperature effect of TiCl4 impregnation of a recrystallized MgCl2 support on propene polymerization

✍ Scribed by Ho Woo Shin; Jin Suk Chung; In Kyu Song; Wha Young Lee

Publisher: John Wiley and Sons
Year: 1995
Tongue: English
Weight: 290 KB
Volume: 196
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.1995.021961127

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✦ Synopsis

Abstract

The MgCl~2~ support for a propene polymerization catalyst was prepared by the recrystallization method using ethanol as a solvent and ethyl benzoate as an internal electron donor. The recrystallized MgCl~2~ was impregnated with TiCl~4~ at various temperatures, and the effect of impregnation temperature on the catalytic activity and isotactic index (I. I.) of polypropene (PP) was investigated. It was found that ethanol and titanium chloride ethoxide (TCE) in the catalyst play an important role in the catalytic activity and I. I. The support treated with TiCl~4~ at high temperatures showed good performance but large activity reduction during polymerization. The enhanced performance is mainly due to activity Ti species containing small amounts of TCE. The large activity reduction is also mainly due to small amounts of ethanol and TCE, yielding small amounts of atactic sites with low Lewis acidity.

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