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Size distribution dynamics in a salting out crystallizer
Author(s) -
Murray D. C.,
Larson M. A.
Publication year - 1965
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690110431
Subject(s) - nucleation , crystallization , chemistry , work (physics) , salting out , suspension (topology) , thermodynamics , steady state (chemistry) , kinetics , growth rate , salting , chemical engineering , mathematics , engineering , physics , geometry , food science , organic chemistry , quantum mechanics , homotopy , aqueous solution , pure mathematics
A laboratory continuous mixed suspension salting out crystallizer was designed and constructed to test the dynamic crystallization model proposed by Randolph and Larson. The model relates the crystal size distribution to nucleation and growth kinetics and operating conditions. The ammonium alum‐ethanol‐water system was selected because of its ease of operation and control. The results of this work were in agreement with the steady state model. Under the conditions of these experiments, it was found that the nucleation rate dN o / dt was related to the growth rate r by dN o /dt = k 1 r 2 . The crystallizer was also operated under unsteady state conditions which resulted from variations in the production rate. The theoretical model with experimentally determined parameters was simulated on an analog computer and solved for production rate changes. The results indicated that the model was in agreement with the dynamic data for production rate upsets.