A New Preparation Method for Porous Titanium Trichloride†
Hiroshi UENO*, Kunihiko IMANISHI, Satoshi UEKI and Tadanao KOHARA
Corporate Research & Development Laboratory, Tonen Corporation; 1-3-1 Nishi-tsurugaoka, Ohi-machi, Iruma-gun, Saitama 356-8505 Japan
A preparation method for high performance porous titanium trichloride catalyst for propylene polymerization was established. α-Titanium trichloride was selectively obtained by reducing titanium tetrachloride with a concentrated alkylaluminum compound. Highly active porous titanium trichloride catalyst was obtained from the mixture of dibutyl ether (ether/Ti>1.0) and hexachloroethane (C2Cl6/Ti>0.8). This catalyst showed 15% higher activity than conventional porous titanium trichloride catalyst. In the treatment of the mixture, crystalline structure would be transformed from α-form to δ-form by the action of chlorine radical. It is considered that the stability and the amount of chlorine radical are important to obtain high activity catalyst.
† The New Preparation Method of High Performance Porous Titaniumtrichloride Catalyst for Propylene Polymerization. Part 2.
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