Phase Equilibrium of Water+Formic Acid+Acetic Acid+Solvent(Amyl Acetate or Diisobutyl Ketone or Diisopropyl Ether)Quaternary Liquid Systems

摘要

Liquid-liquid equilibrium data of water+formic acid+acetic acid+solvent(amyl acetate,diisobutyl ketone,and diisopropyl ether)quaternary systems were measured at 298.15 K and atmospheric pressure.Complete phase diagrams were obtained by determining solubility curves and tie-lines.A comparison of the extracting capabilities of the solvents was made with respect to distribution coefficients,separation factors,and solvent-free selectivity bases.Reliability of the data was ascertained from Othmer-Tobias plots.The tie-lines were also predicted using the UNIFAC model.It is concluded that the used solvents can be treated as suitable separating agents for dilute aqueous formic and acetic acid mixtures.