Effect of hydrotropes on solubility and mass transfer coefficient of amyl acetate

This paper presents a comprehensive study on the effect of citric acid, sod ium benzoate, sodium salicylate and urea (hydrotropes) on the solubility an d mass transfer coefficient for the extraction of amyl acetate in water. Th e influence of a wide range of hydrotrope concentration (0-3.0 mol/l) and d ifferent temperatures (303-333 K) on the solubility of amyl acetate has bee n studied. The influence of different hydrotrope concentrations on the mass transfer coefficients for amyl acetate-water system has been ascertained. Setschenow constant, K-s, a measure of the effectiveness of hydrotrope has been determined for each case. The solubility of amyl acetate increases wit h increase in hydrotrope concentration and also with system temperature. Co nsequent to the increase in the solubility of amyl acetate, the mass transf er coefficient was also found to increase with increase in hydrotrope conce ntration. A Minimum Hydrotropic Concentration (MHC) was found essential to show a significant increase in the solubility and mass transfer coefficient for amyl acetate-water system. The enhancement factor, which is the ratio of value in presence and absence of a hydrotrope is reported for both solub ility and mass transfer coefficients.