Abstract
The effect of various hydrotropes such as sodium salicylate, sodium benzoate, and nicotinamide on the solubility and mass transfer coefficient of stearic acid was investigated under a wide range of hydrotrope concentrations, (0 to 3.0) mol·kg−1, and different system temperatures, T = (303 to 333) K. It was found that the solubility and mass transfer coefficient of stearic acid increase with the increase in hydrotrope concentration and also with system temperature. All hydrotropes used in this work showed an enhancement in the solubility and mass transfer coefficient to different degrees. The order of increase in the solubility and mass transfer coefficient of stearic acid with respect to different hydrotropes was found to be sodium salicylate > sodium benzoate > nicotinamide. The maximum enhancement factor value has been determined for both the solubility and the mass transfer coefficient. The effectiveness of hydrotropes was measured in terms of Setschnew constant Ks and reported for all hydrotropes used in this study. In addition the solubility data are also fitted in a polynomial equation as a function of hydrotrope concentration. The solubility data fitted in a polynomial equation give a better fit since the variance is less than 0.6.
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