Steady-State and Dynamic Modeling of Gas-Phase Polypropylene Processes Using Stirred-Bed Reactors

Neeraj P. Khare, Bruce Lucas, Kevin C. Seavey, Y. A. Liu, Ashuraj Sirohi, Sundaram Ramanathan, Simon Lingard, Yuhua Song, Chau Chyun Chen

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65 Scopus citations

Abstract

This paper describes the development of a comprehensive model for the continuous gas-phase synthesis of polypropylene using stirred-bed reactors. The model considers the important issues of physical property and thermodynamic model selections, polymer properties, catalyst characterization, and reactor residence time, in addition to the traditional Ziegler-Natta polymerization kinetics. Model development involves fundamental chemical engineering principles and advanced software tools, Polymers Plus and Aspen Dynamics. We characterize a Ziegler-Natta catalyst by assuming the existence of multiple catalyst site types. The model contains a single set of kinetic and thermodynamic parameters that accurately predicts the polymer production rate, molecular weight, polydispersity index, and composition for both homopolymer and impact copolymer product grades from a large-scale commercial process. We demonstrate the application of our dynamic model and process control by comparing grade-transition strategies.

Original languageEnglish
Pages (from-to)884-900
Number of pages17
JournalIndustrial and Engineering Chemistry Research
Volume43
Issue number4
DOIs
StatePublished - Feb 18 2004

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    Khare, N. P., Lucas, B., Seavey, K. C., Liu, Y. A., Sirohi, A., Ramanathan, S., Lingard, S., Song, Y., & Chen, C. C. (2004). Steady-State and Dynamic Modeling of Gas-Phase Polypropylene Processes Using Stirred-Bed Reactors. Industrial and Engineering Chemistry Research, 43(4), 884-900. https://doi.org/10.1021/ie030714t