Abstract
This article describes a simple and inex- pensive experimental technique, easy to set-up in a laboratory, for the measurement of solute solubilities in liquids (or gases). Experimental values of solubility were determined for the dissolution of benzoic acid in water, at 293-338 K, of 2-naphthol in water, at 293-373 K, and of salicylic acid in water, at 293-343 K. The experimental results obtained are in good agree- ment with the theoretical values of solubilities presented in literature. Empirical correlations are presented for the prediction of solubility over the en- tire range of temperatures studied, and they are shown to give the solubility value with very good accuracy. List of symbols a radius of the active sphere (m) A area of a soluble sphere (m 2 ) c solute concentration (kg/m 3 ) c0 bulk concentration of solute (kg/m 3 ) c * saturation concentration of solute (kg/m 3 ) cout concentration in the outlet stream (kg/m 3 ) d diameter of inert particles (m) d1 diameter of active sphere (m) D diameter of test column (m) DL longitudinal dispersion coefficient (m 2 /s) D¢m effective molecular diffusion coefficient (m 2 /s) DT transverse (radial) dispersion coefficient (m 2 /s) K permeability in Darcy's law (m 3 s/kg) k average mass transfer coefficient (m/s) L length of test column (m) n number of soluble spheres (-) p pressure (kg/ms 2 ) Pe¢ peclet number based on diameter of active
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