Batch Crystallization with Crystals Attrition

Abstract

The dependence of the mean crystal size of the products from batch crystallizers on the batch time occasionally exhibits a maximum, which can be explained by secondary nucleation due to the attrition of crystals. A kinetic equatation of nucleation, comprising a term for crystal attrition, can be used for the theoretical description of such behaviour. A mathematical model of a batch crystallizer with crystal attrition has been verified on the calcium sulfate precipitation.

Effect of Operating Parameters and Chemical Additives on Crystal Habit and Specific Cake Resistance of Zinc Hydroxide Precipitates

“…Agglomerates may disengage or small crystals adhering to 'thefaces of large crystal may wash off (Sarig and Mullin' 1980). There is also evidence suggesting the existence of an optimum particle age which yields maximum crystal size (Nyvlt and Zacek 1993). For short aging times, the crystal size increases with time.…”

Mesoscale clusters in multicomponent systems: the effect of solution preparation and pre-treatment on primary nucleation of a carbamazepine-saccharin cocrystal

“…It has long been an established fact that the propensity for nucleation is sensitive to the pre-treatment history of the system, for melts 22 as well as solutions of inorganic 23 and organic molecules, 24,25 macromolecules, 26 covering such esoteric cases as the tendency of sugars to crystallize in raisins, 27 and how to increase the working temperature range of energy storage materials. 28 A number of studies of the effect of superheating on the metastable zone width 23,[29][30][31][32] and nucleation induction time 23,33,34 have established qualitatively the effects previously reported; that the propensity to nucleate decreases with increasing time and temperature of superheating during pre-treatment.…”