Some basic aspects of reaction engineering of precipitation processes

Gandhi, K. S. ; Kumar, R. ; Ramkrishna, Doraiswami (1995) Some basic aspects of reaction engineering of precipitation processes Industrial & Engineering Chemistry Research, 34 (10). pp. 3223-3230. ISSN 0888-5885

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Analysis of precipitation reactions is extremely important in the technology of production of fine particles from the liquid phase. The control of composition and particle size in precipitation processes requires careful analysis of the several reactions that comprise the precipitation system. Since precipitation systems involve several, rapid ionic dissociation reactions among other slower ones, the faster reactions may be assumed to be nearly at equilibrium. However, the elimination of species, and the consequent reduction of the system of equations, is an aspect of analysis fraught with the possibility of subtle errors related to the violation of conservation principles. We show how such errors may be avoided systematically by relying on the methods of linear algebra. Applications are demonstrated by analyzing the reactions leading to the precipitation of calcium carbonate in a stirred tank reactor as well as in a single emulsion drop. Sample calculations show that supersaturation dynamics can assume forms that can lead to subsequent dissolution of particles that have once been precipitated.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:11526
Deposited On:16 Nov 2010 13:50
Last Modified:02 Jun 2011 05:08

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