Phase and extraction equilibria in the water-ethoxylated nonylphenol-sodium sulfate system

Phase equilibria in the water-ethoxylated nonylphenol (neonol AF 9-12)-sodium sulfate system were studied at 25 degrees C using isothermal titration and isothermal section methods. It was found that neonol AF 9-12 exerts a dehydrating effect on sodium sulfate. The optimum extraction parameters were determined for the studied system: the neonol AF 9-12: Na2SO4 weight ratio is 1:3, and the water weight fraction is 80.0%. The effect of the hydrochloric acid concentration on the distribution of iron(iii) ions and ions of the indium subgroup elements was investigated, and the distribution of iron(iii) ions in the presence of organic complexing agents including antipyrine, diantipyrylmethane, and acetylacetone was studied. Conditions for quantitative extraction of thallium(iii) in the form of tetrachlorothallate ion by neonol AF 9-12 were established. The possibility of concentrating the iron(iii) in the form of the acetylacetonate complexes was demonstrated.