Abstract
The fluidized-bed crystallizers have long been used in the chemical industry and recently for water treatment as the so-called pellet reactors. This report summarizes the experimental results regarding hydrodynamics and crystal growth rates in laboratory-scale fluidized-bed crystallizers. The two-step crystal growth model rather than the over-all model is adopted to explain the observed kinetic behaviors. In using the two-step growth model, the disadvantage is the uncertainty of the surface-reaction order. A reliable method is suggested to explore the surface-reaction order using a lean fluidized-bed crystallizer. The crystal growth process of sparingly soluble salts, which have been studied recently for a few systems, seems more complex than that of soluble salts. Then, a comparison of crystal growth kinetics of soluble salts is made between the dense and lean fluidized-bed crystallizers. As a conclusion, the two-step growth model is suitable for the estimation of crystal growth rates in the design of a liquid fluidized-bed crystallizer.
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