NDLI: Effect of Water on the Supported Ziegler–Natta Catalysts: Optimization of the Operating Conditions by Response Surface Methodology

Content Provider	Springer Nature Link
Author	Rahbar, Ameneh Nekoomanesh Haghighi, Mehdi Bahri Laleh, Naeimeh Abedini, Hossein
Copyright Year	2015
Abstract	In this study different water containing adducts, with MgCl2·nEtOH·mH2O formula, were synthesized through melt quenching method. After characterization of support samples, the final catalysts were prepared by reaction of the samples with TiCl4 and tested in slurry phase propylene polymerization. The prepared catalysts showed similar stereospecificities but different activities in polymerization experiments, so that, with increasing water amount from m = 0.0 to m = 0.4 wt%, the catalyst activity reached its maximum value of 4.62 kgPP/g Cat.h, and then by further water increase, from m = 0.4 to m = 1.0 wt%, the activity decreased. After optimizing water content, to reach the maximum efficiency of the catalytic system, optimization of the synthesis conditions was considered via response surface methodology. The studied operation conditions affecting the catalyst efficiency were volume ratio of TiCl4 to toluene (V), initial TiCl4 injection temperature (I) and TiCl4 injection time (T). Results showed that catalytic performance is strongly dependent on its preparation conditions. Analysis of variance indicated that V and I are the most effecting parameters on the catalyst activity with F-value of 39.64, and 8.12, respectively. Indeed, it was found that TiCl4 injection time had no enormous effect on the catalyst activity, but in combination with V, the injection time increment through the scrutinized range decreased the polymerization activity. The obtained model provided a promising tool for designing suitable catalysts for polypropylene production using MgCl2/TiCl4 based Ziegler–Natta catalysts.The focus of the present study is to explore how the presence of water in the adduct synthesis step affects the final ZN catalyst performance in propylene polymerization. Besides water amount, effect of important catalyst synthesis parameters on the catalytic performance was studied as well through response surface methodology.
Starting Page	1186
Ending Page	1195
Page Count	10
File Format	PDF
ISSN	1011372X
Journal	Catalysis Letters
Volume Number	145
Issue Number	5
e-ISSN	1572879X
Language	English
Publisher	Springer US
Publisher Date	2015-03-18
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ziegler–Natta catalyst Propylene polymerization Water Response surface method Activity Catalysis Industrial Chemistry/Chemical Engineering Organometallic Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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