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Stability of the class II classified product crystallizer with fines removal

1973; Wiley; Volume: 19; Issue: 6 Linguagem: Inglês

10.1002/aic.690190610

1547-5905

Alan D. Randolph, Gary L. Beer, James P. Keener,

Chemical and Physical Properties in Aqueous Solutions

Abstract The stability of crystal‐size distribution (CSD) in the classified product crystallizer with fines removal was investigated using spectral techniques to determine stable solutions of the linearized population balance. The model used to describe the crystallizer assumed rapid growth kinetics (high yield), magma‐dependent secondary nucleation, and recycle of dissolved fines. Fines removal and classified product removal were characterized in the model by piece‐wise constant removal rates ( R – 1) and z times the MSMPR removal rate, respectively. Stability regions were presented as critical values of the kinetic nucleation/growth rate exponent i = d (log B °)/ d (log G ) versus dimensionless parameters of the system. The parameters which influence CSD stability were maximum fines size and removal rate, product classification size and removal rate, and the magama‐characterizing exponent in the nucleation expression. Whether or not dissolved fines are recycled directly back to the crystal magma also influences stability.