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dc.contributor.author
Klaue, Antoine
dc.contributor.author
Kruck, Matthias
dc.contributor.author
Friederichs, Nic
dc.contributor.author
Bertola, Francesco
dc.contributor.author
Wu, Hua
dc.contributor.author
Morbidelli, Massimo
dc.date.accessioned
2019-02-25T13:27:31Z
dc.date.available
2019-02-01T04:44:52Z
dc.date.available
2019-02-06T14:01:21Z
dc.date.available
2019-02-25T13:27:31Z
dc.date.issued
2019-01-16
dc.identifier.other
10.1021/acs.iecr.8b05296
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/322308
dc.identifier.doi
10.3929/ethz-b-000322308
dc.description.abstract
In Ziegler–Natta catalysis, the catalyst particle size has a strong influence not only on catalyst performance but also on the morphology and particle size distribution of the final polymer particles. Fundamental insight into the catalyst particle formation process is therefore of industrial importance when addressing specific requirements in the final products. In the present work, we fully characterize a single-step catalyst preparation process, which comprises a reactive precipitation of a MgCl2-supported Ziegler–Natta catalyst, through decomposition of the hetero-bimetallic complex, Mg(OR)2·Ti(OR)4, by addition of ethyl aluminum dichloride (EADC). We track the evolution of both of the concentrations of the metals (Mg, Ti, Al) as well as Cl in the liquid phase and the size of the formed catalyst particles. It is observed that the liquid-phase composition is governed by the EADC feed rate under fully Cl-starved conditions. The process can be divided into two stages: The first stage is dominated by the precipitation of the Mg-based support, and the second stage involves complex adsorption–precipitation of the Ti species. The growth of the catalyst particle size occurs only in the first stage and is controlled by the aggregation and breakage events during the MgCl2 precipitation. It follows that the hydrodynamic stress in the reactor plays the essential role in controlling the catalyst size. In the second stage, no further particle growth occurs, not only because of the depletion of Mg in the liquid phase but also because the adsorbed Ti complex stabilizes the particles against aggregation. Finally, we have performed polymerization tests with the prepared catalysts and found that the size distribution of the polymer particles indeed closely replicates the one of the used catalyst particles.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Chemical Society
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.title
Insight into the Synthesis Process of an Industrial Ziegler-Natta Catalyst
en_US
dc.type
Journal Article
dc.rights.license
In Copyright - Non-Commercial Use Permitted
dc.date.published
2018-12-21
ethz.journal.title
Industrial and Engineering Chemistry Research
ethz.journal.volume
58
en_US
ethz.journal.issue
2
en_US
ethz.pages.start
886
en_US
ethz.pages.end
896
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2019-02-01T04:44:55Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-02-06T14:01:56Z
ethz.rosetta.lastUpdated
2019-02-25T13:27:39Z
ethz.rosetta.versionExported
true
ethz.COinS
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