EFFECT OF SOME INORGANIC SALTS ON THE TERNARY LIQUID-LIQUID EQUILIBRIA OF THE WATER PLUS 4-METHYL-2-PENTANONE PLUS PROPANOIC OR BUTANOIC ACID AT 35-DEGREES-C

The effect of sodium chloride, sodium nitrate, sodium sulfate, zinc su lfate, and ammonium sulfate on the liquid-liquid equilibria (LLE) of m ater + 4-methyl-2-pentanone + propanoic or butanoic acid at 35 degrees C has been studied. The ternary LLE data of the systems have been pre dicted using the NRTL equation, the parameters of which were obtained from the infinite dilution activity coefficient values. The distributi on data of the salt containing ternary liquid systems have been correl ated through the use of the modified Campbell equation, and the consta nts obtained have been used to determine the extract phase solute conc entrations and also to calculate the salt effect parameter. Results ba sed on the modified Campbell equation show the following order of effe ctiveness of salts for systems containing propanoic acid: Na2SO4 > ZnS O4 > NaCl > (NH4)(2)SO4 > NaNO3. And for systems with butanoic acid: ( NH4)(2)SO4 > Na2SO4 > NaCl > ZnSO4 > NaNO3.