Multicomponent flash algorithm for mixtures containing polydisperse polymers

Authors

  • Stefan Behme,

    1. Chair of Thermodynamics and Thermal Separation Processes, Technical University of Berlin, 10623 Berlin, Germany
    Current affiliation:
    1. ZT-ENG-Healthcare Prozessplanung, Bayer Corp., B58-2, 800 Dwight Way, Berkeley, CA 94710
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  • Gabriele Sadowski,

    1. Chair of Thermodynamics and Thermal Separation Processes, Technical University of Berlin, 10623 Berlin, Germany
    Current affiliation:
    1. Lehrstuhl für Thermodynamik, Universität Dortmund, Emil-Figge-Strasse 70, 44227 Dortmund, Germany
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  • Yuhua Song,

    1. Aspen Technology, Inc., Cambridge, MA 02141
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  • Chau-Chyun Chen

    Corresponding author
    1. Aspen Technology, Inc., Cambridge, MA 02141
    • Aspen Technology, Inc., Cambridge, MA 02141
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Abstract

An algorithm called POLYMIX is introduced for flash calculations of multicomponent systems containing polydisperse polymers. The polydispersity of polymers is taken into account through the concept of pseudocomponents. In industrial practice, a relatively high number of pseudocomponents are often required to represent multimodal polymer molecular-weight distributions. The algorithm formulation is independent of use of specific segment-based polymer equations of state for computing thermodynamic properties of polymer mixtures. The algorithm further offers the advantage that the computing time for polymer flash calculations is independent of the number of pseudocomponents used to represent the polydisperse polymer. Applications to polymer mixtures containing polyethylene and polypropylene are presented.

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