Vapor-liquid equilibrium data at atmospheric pressure of the system: acetone-methanol-salt are studied. The Salts, Kl, NaCl, MgCl₂, CaCl₂, LiCl, and CaBr₂ are examined to observe the salt effect on the acetone-methanol system.
Effective salts are CaCl₂, LiCl and CaBr₂, which are more soluble in methanol than Kl, NaCl and MgCl₂. CaCl₂, LiCl and CaBr₂ are observed to shift the azeotropic composition from 8O.1 to 88.6, 91.0 and 94.0 mole % of acetone, respectively. The salt effect at each infinite dilute concentration of acetone and methanol increases with the increasing solubility of each salt in the rich concentration component.