Some Basic Aspects of Reaction Engineering of Precipitation Processes

Gandhi, KS and Kumar, R and Ramkrishna, Doraiswami (1995) Some Basic Aspects of Reaction Engineering of Precipitation Processes. In: Industrial & Engineering Chemistry Research, 34 (10). pp. 3223-3230.

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Abstract

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. This paper shows 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:	Journal Article
Publication:	Industrial & Engineering Chemistry Research
Publisher:	American Chemical Society
Additional Information:	Copyright of this article belongs to American Chemical Society.
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	26 May 2011 06:34
Last Modified:	26 May 2011 06:34
URI:	http://eprints.iisc.ac.in/id/eprint/37907

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