Particle Growth and Single Particle Modeling

Soares, João B. P.; McKenna, Timothy F. L.

doi:10.1002/9783527646944.ch7

Cited by 5 publications

References 29 publications

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Multiscale modelling of multizone gas phase propylene (co)polymerization reactors—A comprehensive review

et al. 2022

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Catalysts and polymerization processes have evolved over the years. Such significant developments have allowed producers to broaden the range of polymer microstructure and process productivity, thereby making it possible to offer a wide range of end-use properties at a reasonably low cost. However, these advantages in catalyst performance and reactor operation require that we understand as much as possible about reactor operation in the broadest sense. In addition to the fundamental experimental study of polymer chemistry, this means that one needs to develop complete, robust process models. The present paper provides a rapid overview of recent developments in various gas phase propylene (co)polymerization reactors in use today, concentrating on multizone gas phase polypropylene reactors: i.e.,

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Multiscale modelling of multizone gas phase propylene (co)polymerization reactors—A comprehensive review

et al. 2022

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Effect of the structure of titanium–magnesium catalysts on the morphology of polyethylene produced

Mikenas

Koshevoy

Захаров

2017

J. Polym. Sci. Part A: Polym. Chem.

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The structure and formation of polyethylene (PE) particles on supported titanium–magnesium catalysts having different structural characteristics (sizes of microcrystallites, mesopores, and subparticles) were studied for the first time. Scanning electron microscopy was used to identify structural elements of the polymer particles formed over such catalysts and to reveal morphological changes in the growing polymer particles when the yield was increased from approximately 0.2 g PE/g catalyst to approximately 13 kg PE/g catalyst. A relationship was found between structural characteristics of the porous catalyst particles, morphology of the nascent polymer particles, and bulk density of the polymer powder. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 2298–2308

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Influence of the particle size of the MgCl₂ support on the performance of Ziegler catalysts in the polymerization of ethylene to ultra‐high molecular weight polyethylene and the resulting polymer properties

Philippaerts

Ensinck

Baulu

et al. 2017

J. Polym. Sci. Part A: Polym. Chem.

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A highly systematic size series of Ziegler catalysts with similar porosities and surface textures are synthesized by varying the stirring speed during the MgCl 2 support synthesis. Besides the mean particle size, the only substantial difference observed between the various catalysts is the size and number of nodules per particle. Varying the mean diameter of the catalyst particles between 1.5 and 11.9 mm, leads to a pronounced impact on the activity in ultra-high molecular weight polyethylene (UHMWPE) polymerization, while the M w capabilities are only affected to a limited extend. In addition, it is observed that both the M w s as the polymer bulk density (BD) increases during the course of the polymerization. This particularity allows to optimize the M w and/or BD at a set polymer size, by tuning the catalyst particle size. This is particularly interesting in UHMWPE production, as control of the morphological and structural properties of the UHMWPE reactor powders are critical for efficient processing as well as the performance of the final product.

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Particle Growth and Single Particle Modeling

Cited by 5 publications

References 29 publications

Multiscale modelling of multizone gas phase propylene (co)polymerization reactors—A comprehensive review

Multiscale modelling of multizone gas phase propylene (co)polymerization reactors—A comprehensive review

Effect of the structure of titanium–magnesium catalysts on the morphology of polyethylene produced

Influence of the particle size of the MgCl₂ support on the performance of Ziegler catalysts in the polymerization of ethylene to ultra‐high molecular weight polyethylene and the resulting polymer properties

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Particle Growth and Single Particle Modeling

Cited by 5 publications

References 29 publications

Multiscale modelling of multizone gas phase propylene (co)polymerization reactors—A comprehensive review

Multiscale modelling of multizone gas phase propylene (co)polymerization reactors—A comprehensive review

Effect of the structure of titanium–magnesium catalysts on the morphology of polyethylene produced

Influence of the particle size of the MgCl2 support on the performance of Ziegler catalysts in the polymerization of ethylene to ultra‐high molecular weight polyethylene and the resulting polymer properties

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Product

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Influence of the particle size of the MgCl₂ support on the performance of Ziegler catalysts in the polymerization of ethylene to ultra‐high molecular weight polyethylene and the resulting polymer properties