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A comparative study describing gas-phase propylene polymerization in  fluidized-bed reactors using Ziegler-Natta catalyst is presented. The reactor  behavior was explained using a two-phase model (which is based on principles  of fluidization) as well as simulation using the Aspen Polymers process  simulator. The two-phase reactor model accounts for the emulsion and bubble  phases which contain different portions of catalysts with the polymerization  occurring in both phases. Both models predict production rate, molecular  weight, polydispersity index (PDI) and melt flow index (MFI) of the polymer.  We used both models to investigate the effect of important polymerization  parameters, namely catalyst feed rate and hydrogen concentration, on the  product polypropylene properties, such as production rate, molecular weight,  PDI and MFI. Both the two-phase model and Aspen Polymers simulator showed  good agreement in terms of production rate. However, the models differed in  their predictions for weight-average molecular weight, PDI and MFI. Based on  these results, we propose incorporating the missing hydrodynamic effects into  Aspen Polymers to provide a more realistic understanding of the phenomena  encountered in fluidized bed reactors for polyolefin production

Comparative simulation study of gas-phase propylene polymerization in fluidized bed reactors using aspen polymers and two phase models