Abstract
Effect of bottom shapes of vessels on crystal size distribution was investigated using a flat, a dished and a profiled bottom vessels for seeded batch crystallization of aluminum potassium sulfate. Two evident crystal size subdistributions (two maxima) were obtained for the flat and dished bottom vessels whereas only a single maximum was observed and the fraction of small crystals became larger than the other two types of vessels in the case of the vessel with a profiled bottom. The flow pattern and the particle motion in vessels with three different bottom shapes were measured in detail prior to the experiment. The results demonstrate that agglomeration of particles due to the induced circulation at the bottom of vessels with flat and dished shapes is the cause for the presence of two maxima.
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