INTERFACIAL-TENSION IN 4-ALKYLPHENYLAMINE HYDROCARBON WATER-SYSTEMS

Interfacial tension isotherms were determined in hydrocarbon-water systems for 4-alkylphenylamines containing from 6 to 16 carbon atoms in their alkyl groups, and the surface excess isotherms were computed using various adsorption isotherms. Palladium (II) was extracted with 4-alkylphenylamines from 3 N HCl solutions. The maximum extraction rate of palladium (II) is observed for 4-decyl- and 4-dodecylphenylamines characterized by their best adsorption at the interface. Compounds easily soluble in the aqueous phase (4-hexylphenylamine) or in toluene (4-hexadecylphenylamine) extract palladium (II) slower than 4-decyl- and 4-dodecylphenylamines. © 1990.