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Modeling and simulation of polypropylene particle size distribution in industrial horizontal stirred bed reactors
Author(s) -
Tian Zhou,
Gu XuePing,
Feng LianFang,
Corriou JeanPierre,
Hu GuoHua
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.36473
Subject(s) - polypropylene , residence time distribution , materials science , polymer , particle size distribution , crystallinity , particle (ecology) , particle size , steady state (chemistry) , chemical engineering , polymerization , molar mass distribution , mass transfer , polymer chemistry , composite material , thermodynamics , chemistry , chromatography , physics , inclusion (mineral) , oceanography , engineering , geology
This work aims at developing a steady‐state particle size distribution (PSD) model for predicting the size distribution of polypropylene particles in the outflow streams of propylene gas‐phase horizontal stirred bed reactors (HSBR), on the one hand and investigating the effect of the catalyst residence time distribution (RTD) on the polymer PSD, on the other hand. The polymer multilayer model (PMLM) is used to describe the growth of a single particle. Knowing the PSD and RTD of a Ziegler–Natta type of catalyst and polymerization kinetics, this model allows calculating the polymer PSD of propylene polymerization in the HSBRs. The calculated polypropylene PSDs agree well with those obtained from the industrial reactors. The results reveal that both the PSD and the RTD of the catalyst affect the polymer PSD but in different manners. The effect of RTD on the PSD is less significant in the case of a nonuniform size catalyst feed. This model also allows investigating the effects of other process parameters on the polymer PSD under steady‐state conditions, including intraparticle mass‐ and heat‐transfer limitations, initial catalyst size, and polymer crystallinity. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012