• the effects of partial replacement of ticl4 by ti(or)4 on the performance of mgcl2-supported ziegler–natta catalysts

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     in a ti-based ziegler–natta catalyst with in situ generated mgcl2, the titanium tetrachloride (ticl4) was partially replaced by titanium tetra-alkoxide (ti(or4)), where r was either ethyl or n-butyl, and the effect of the addition order of the titanium compound was evaluated. for comparison, two other catalysts were synthesized: (1) one had the same amount of ti, exclusively from ticl4; (2) the other is employed in industrial processes and was used as the reference. ti3+ comprised 85% of the total amount of titanium added during the catalyst synthesis. the amount of soluble ti in the supernatant phase was at most 0.002 mol l−1, indicating that the added ti reacted with the support. in general, ziegler–natta catalysts demand a significant amount of raw materials, while these catalysts require a lower amount of titanium compounds and save a significant amount of solvent in particular during the synthesis (approximately 80%). the preparation time of the catalysts was also reduced. the performance of these catalysts during ethylene polymerization suggests that adding ti(or)4 created a catalyst with a similar activity and ability to form high-density polyethylene as the reference catalyst.

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