The Importance of Classification in Well-Mixed Crystallizers

  • A. H. Janse
  • E. J. De Jong


When a slurry is removed from a crystallizer, classification or non ideal product removal can occur. Classification means that the concentration of particles In the product stream and the average concentration in the crystallizer are different. Recently more information about the classification phenomenon has become available (1–4). It was realized that this phenomenon is very important for the correct Interpretatlonof measured population density curves as well as for the particle size control in industrial crystallizers. Therefore some so-called classification experiments using glass beads and water have been carried out in a 42.5 1 crystallizer. In this paper we present some of our results and discuss the importance of the classification phenomenon.


Glass Bead Fluid Velocity Terminal Velocity Product Stream Stirrer Speed 
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  1. 1.
    Aeschbach, S. and Bourne, J.R.; Chem. Eng. J. 4 (1972), 234.CrossRefGoogle Scholar
  2. 2.
    Bourne, J.R. and Sharma, R.N.; Paper presented at the first European Conf. on Mixing and Centr. Separation 9–11 Sept. 1974 Cambridge.Google Scholar
  3. 3.
    Janse, A.H. and de Jong, E. J.; Preprint of the G. V.C./A. I.Ch.E. Joint Meeting Muchen 17–20 sept. 1974 no. A6–2.Google Scholar
  4. 4.
    Rehakova, M. and Novsad, N.; Coll.Czech. Chem. Comm. 36 (1971), 3004–3012.Google Scholar
  5. 5.
    Rushton, J.H.; Preprint A.I.Ch.E. Inst, of Chem. Engrs. Joint Meeting London, june 1965.Google Scholar
  6. 6.
    Zwietering, T.N.; Chem. Eng. Sci. 8 (1958), 244.CrossRefGoogle Scholar
  7. 7.
    Kolar, V.; Coll. Czech. Chem. Comm. 26 (1961), 613.Google Scholar
  8. 8.
    Asselbergs, C.J. and de Jong, E.J.; Paper in this symposium.Google Scholar

Copyright information

© Plenum Press, New York 1976

Authors and Affiliations

  • A. H. Janse
    • 1
  • E. J. De Jong
    • 1
  1. 1.Laboratory for Chemical EquipmentDelft University of TechnologyDelftThe Netherlands

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