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Attrition and Secondary Nucleation in Agitated Crystal Slurries

  • P. D. B. Bujac

Abstract

The objective of our study is to determine methods of scaling-up nucleation rates, measured in the laboratory, for the design and optimisation of full-scale crystallisers. It is usually accepted that the dominant form of nucleation occurring in continuous industrial crystallisers is secondary nucleation. Recent research has shown that this nucleation is caused by some form of attrition mechanism, (1, 2). This mechanism is either the detachment, by impact or fluid-shear, of clusters from a parent crystal or the fracture of the parent crystal surface, by some form of comminution, and the production of discrete crystal fragments. The major factors influencing this mechanism are the system super-saturation and the crystalliser hydrodynamics. The supersaturation will control both the parent crystal surface and the survival and development of the clusters or fragments into product crystals. The crystalliser hydrodynamics will control the collision energies and collision frequencies of the parent seeds.

Keywords

Nucleation Rate Attrition Rate Coulter Counter Seed Crystal Secondary Nucleation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Clontz N A and McCabe W L, Chem. Eng. Progr. Symp. Ser., No. 110, 67, (1971) 6.Google Scholar
  2. 2.
    Strickland-Constable R F, “Kinetics and Mechanism of Crystallisation”, Academic Press, London (1968).Google Scholar
  3. 3.
    Ramshaw C and Parker I B, Trans. Instn. Chem. Engrs., 51, (1973), 72.Google Scholar
  4. 4.
    Randolph A D and Cise M D, AIChEJ. 18, (1972), 798.CrossRefGoogle Scholar
  5. 5.
    Randolph A D and Sikdar S K, AIChEJ. 20, (1974), 410.CrossRefGoogle Scholar
  6. 6.
    Garabedian H and Strickland-Constable R F, J. Crystal Growth, 13/14, (1972), 506.ADSCrossRefGoogle Scholar
  7. 7.
    Wey J S and Terwilliger J P, AIChEJ. 20, (1974), 1219.CrossRefGoogle Scholar
  8. 8.
    Rosen H N, AIChEJ, 20, (1974), 388.CrossRefGoogle Scholar
  9. 9.
    Garabedian H and Strickland-Constable R F, J. Crystal Growth 12, (1972), 53.ADSCrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1976

Authors and Affiliations

  • P. D. B. Bujac
    • 1
  1. 1.ICI Corporate LaboratoryRuncorn, CheshireEngland

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