Modeling monomer transport by convection during olefin polymerization

U. Parasu Veera, G. Weickert, U.S. Agarwal

    Research output: Contribution to journalArticleAcademicpeer-review

    27 Citations (Scopus)

    Abstract

    During olefin polymn. on heterogeneous catalyst, a catalyst particle undergoes fragmentation, and the formed polymer gets deposited on the fragments. These polymer-coated fragments (microparticles) together form a porous polymer particle (macroparticle). The multigrain model (MGM) gives a detailed description by accounting for the monomer diffusion phenomena at both levels. The original approach to soln. involved a sequential shell-by-shell detn. of monomer concn. profiles, with both radial boundaries of the shells moving with the particle growth. A fixed boundary system of simultaneous differential equations enables easier computer implementation of the MGM model. Further, in a new development presented here, the interstitial spaces between the microparticles make up the pores through which monomer transport occurs not only by diffusion, but also by convection. The convection is driven by the pressure gradient created by the monomer consumption within the particle. Consistent with recent exptl. observations, significantly higher monomer transport rates are thus predicted. [on SciFinder (R)]
    Original languageEnglish
    Pages (from-to)1062-1070
    Number of pages9
    JournalAIChE Journal
    Volume48
    Issue number5
    DOIs
    Publication statusPublished - 2002

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