The effect of mixedness on crystal size distribution in a continuous crystallizer

Zuoliang Sha, Marjatta Louhi-Kultanen, Kohei Ogawa*, Seppo Palosaari

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)


The concept of a MSMPR crystallizer, in which all crystals are assumed to disperse perfectly in suspension regardless of the crystal size, has mostly been used in the study on crystallization in order to simplify the discussion. However, there is a possibility that the spacial suspension density distribution in a crystallizer affects the crystal size distribution of the product. In this work, the effect of the spatial suspension density distribution in the crystallizer on the crystal size distribution of the product has been studied experimentally by using two types of continuous crystallizers. For expressing the mixing degree of all crystals of all sizes in the crystallizer, the multi-component mixedness defined by Ogawa was used after the definition was expanded. Experimental results show that the suspension density and the crystal size distribution are different at different heights in the crystallizers. The variation of the mixedness with impeller rotational speed is made clear. It is clarified that the mean crystal size of product crystals increases with decreasing mixedness. The usefulness of mixedness as an indicator of the classification in the crystallizer is made clear.

Original languageEnglish
Pages (from-to)55-60
Number of pages6
Issue number1
Publication statusPublished - Feb 1998
MoE publication typeA1 Journal article-refereed


  • Continuous Crystallizer
  • Crystal Size Distribution
  • Crystallization
  • Mixing
  • Suspension

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