Z. Rojkowski

Warsaw University of Technology, Warszawa, Masovian Voivodeship, Poland

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Publications (3)7.42 Total impact

  • Zbigniew H. Rojkowski
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    ABSTRACT: It is shown that the population balance in a mixed suspension mixed product removal crystallizer (MSMPRC), for the case of constant (initial) crystal growth rate dispersion mechanism, can be transformed into a form similar to that valid for the size-dependent growth rate mechanism. This allows one to interpret the experimental crystal size distribution data resulting from the dispersion in terms of size-dependent mean growth rate. An example of fitting several empirical models of constant growth rate dispersion and of size-dependent growth rate to series of experimental data for aluminum ammonium alum crystallizing from its water solution in the MSMPRC is presented and discussed.
    No preview · Article · Dec 1993 · Chemical Engineering Science
  • Z. Rojkowski

    No preview · Article · Dec 1990 · Chemical Engineering Science
  • Z. Rojkowski
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    ABSTRACT: Semilogarithmic population density plots of a crystal product from MSMPR (mixed-suspension, mixed-product-removal) crystallizers frequently show concave-upward curvature. This has been explained either by the apparent size-dependent growth of crystals or by the phenomenon of crystal growth rate dispersion. Even though most of recent experiments support the latter reason, experimental data from MSMPR crystallizers still are considered to yield kinetics under the assumption of size-dependent growth, partly because it is just easier. When size distributed nucleation, size-dependent growth, and negligible crystal attrition are assumed, the population balance in an MSMPR crystallizer at a steady state is represented in partial differential equation form. The proper initial condition for balance equation is derived and its consequences are discussed.
    No preview · Article · Apr 1990 · AIChE Journal

Publication Stats

19 Citations
7.42 Total Impact Points


  • 1990-1993
    • Warsaw University of Technology
      • Faculty of Chemical and Process Engineering
      Warszawa, Masovian Voivodeship, Poland