NDLI: Effect of fragment size distribution on reaction rate and molecular weight distribution in heterogeneous olefin polymerization

Content Provider	Springer Nature Link
Author	Nouri, Marzieh Arabi, Hassan Parvazinia, Mahmoud
Copyright Year	2015
Abstract	A one-dimensional polymeric flow model is used to study the effect of particle fragment size and size distribution on molecular weight distribution and particularly on reaction yield in heterogeneous olefin polymerization. The broadness of molecular weight distribution is explained by a multi-active site assumption, while the high rate of reaction for active catalysts due to diffusion limitations in the particle is questionable. In this study, the modeling is shifted from particle to fragment level. The fragments are assumed to be spherical and homogeneous with regular physical properties, separated from each other by interconnected cracks. There is only monomer diffusion taking place inside the particle, while in comparison the diffusion inside the cracks is much higher. Diffusion coefficient is assumed to be similar in all cracks. The polymer particle is taken to be made up of seven different size fragments from 0.5 to 3.5 µm, distributed in five different patterns. The results show that by introducing the fragments and fragment size distribution in the particle model higher yields of polymerization can be achieved. In other words, the fragments and cracks inside the particle can make strong impact on the reaction yield while the results show that the broadness of molecular weight and consequently a higher PDI can be justified by the multiple sites assumption.
Starting Page	437
Ending Page	448
Page Count	12
File Format	PDF
ISSN	10261265
Journal	Iranian Polymer Journal
Volume Number	24
Issue Number	6
e-ISSN	17355265
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-05-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Olefin polymerization Polymeric flow Fragment size Ceramics, Glass, Composites, Natural Methods Heterogeneous catalyst Particle modeling
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Polymers and Plastics

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