DISSOLUTION OF SOLID PARTICLES IN LIQUIDS

The behavior of the dissolution of solid particles in liquids is modeled kinetically. It is assumed that a surface layer exists near the solid-liquid interface; the diffusion of solute molecules through this layer is the rate controlling step. Analytical expressions for the description of the temporal variation of the size of a particle and for the dissolution time of a particle are derived. The present analysis takes the effect of the dissolved solute on the bulk liquid concentration into account, and, therefore, is applicable for both low solubility cases and for high solubility cases. The effects of polydispersed particles and variable surface layer thickness on dissolution kinetics are discussed. A criterion for neglecting the effect of dissolved solute on bulk liquid concentration is suggested. © 1991.