Effect of Particle-Impeller Impact Rate on Properties of Product Crystals in Agitated Crystallizers of Different Sizes.

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Crystallization experiments of aluminium potassium sulfate were carried out in agitated crystallizers of different sizes equipped with six-bladed Rushton disc turbines. Properties of the product crystals, that is the agglomerate ratio, the size distribution, the Sauter mean diameter and the total number of product crystals, were measured and the particle-impeller impact rate was calculated according to a correlation previously derived by the authors. By comparing these results, the effects of particle-impeller impact rate on the properties of product crystals were investigated. As a result, it was found that the total number of product crystals increases, the agglomerate ratio decreases and the size distribution becomes narrow with an increase in impact rate. The results obtained for agitated crystallizers of different sizes indicated that the same agglomerate ratio, size distribution or weight mean diameter of the product crystals is given at a constant mean energy dissipation rate throughout the vessel. On the other hand, the same dimensionless number of product crystals is obtained at a constant impeller tip speed for geometrically similar systems.

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