SALT EFFECT ON LIQUID-LIQUID EQUILIBRIUM OF THE METHYL ISOBUTYL KETONE-ACETIC ACID-WATER SYSTEM AT 35-DEGREES-C

The effect of inorganic salts (sodium chloride, sodium nitrate, sodium sulphate, zinc sulphate and ammonium sulphate) on the methyl isobutyl ketone-acetic acid-water system at 35 degrees C has been studied and the correct experimental procedure for the determination of the data o f salt containing ternary liquid-liquid equilibrium (LLE) systems asce rtained. The Campbell correlation is modified to fit the data of salt containing ternary liquid systems. The distribution data of these salt containing systems have been correlated through the use of the modifi ed Nernst, modified Campbell and the Eisen-Joffe equations and the con stants obtained have been used to predict extract phase solute concent rations and also to calculate the salt effect parameter. Results based on the modified Nernst equation show the following order of effective ness of salts: ZnSO4 > Na2SO4 > (NH4)(2)SO4 > NaCl > NaNO3. The order of effectiveness of the salts based on the salt effect parameter deriv ed from the modified Campbell and the Eisen-Joffe constants are also d iscussed.