INTERFACIAL-TENSION ESTIMATION IN MODEL EXTRACTION SYSTEMS CONTAININGMIXED DILUENTS

Linear solvation energy relationships, based on application of Kamlet and Taft model, were used to predict the interfacial tension isotherms of 1-(2'- hydroxy-5'-methylphenyl)-decane-1-one oxime in the systems containing octane, toluene and their mixtures as model dilutes. The co rrelations found permit: (i) to predict the interfacial tension and su rface pressure at given concentration of model extractant; (ii) to est imate A and B parameters in Szyszkowski equation and then to predict t he whole adsorption isotherms in systems containing various amounts of toluene; (iii) to predict the surface excess for different concentrat ion of extractant in each individual system. The linear solvation ener gy relationships enable also to formulate semiempirical equations for the interfacial tension, surface pressure and the surface excess isoth erms which contain separated effects of extractant concentration and d iluent properties.