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The effects of partial replacement of TiCl4 by Ti(OR)4 on the performance of MgCl2-supported Ziegler–Natta catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41001 45874 2012 9 PDF Available
Title
The effects of partial replacement of TiCl4 by Ti(OR)4 on the performance of MgCl2-supported Ziegler–Natta catalysts
Abstract

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.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (97 K)Download as PowerPoint slideHighlights► Partial replacement of TiCl4 by Ti(OR)4 in Ziegler–Natta catalysts. ► Reduction of preparation time and reagents. ► Similar characteristics to the industrial plant catalyst in terms of activity and high density polyethylene properties.

Keywords
Ziegler–Natta catalyst; High-density polyethylene; Titanium tetra-alkoxide
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The effects of partial replacement of TiCl4 by Ti(OR)4 on the performance of MgCl2-supported Ziegler–Natta catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 423–424, 7 May 2012, Pages 69–77
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us