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Effect of Inorganic Salts on the Isobaric Vapor–Liquid Equilibrium of the Ethyl Acetate–Ethanol System

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Department of Chemical Engineering, Indian Institute of Technology, Madras, Chennai-600 036, India
Cite this: J. Chem. Eng. Data 2013, 58, 3, 560–569
Publication Date (Web):February 20, 2013
Copyright © 2013 American Chemical Society

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    The effect of various salts such as magnesium nitrate, calcium nitrate, zinc nitrate, and magnesium chloride on vapor–liquid equilibrium (VLE) of the ethyl acetate–ethanol system was studied experimentally in a modified Othmer still at atmospheric pressure. The influence of cation and anion of the salts on the VLE of the ethyl acetate–ethanol system was examined. It was observed that the order of effect of salts for breaking the azeotrope was Zn(NO3)2 > Ca(NO3)2 > Mg(NO3)2 > MgCl2. Salting-out coefficients were calculated using the scaled particle theory. The experimental vapor–liquid equilibrium data with salt was compared with that calculated using the scaled particle theory, and the agreement was satisfactory. Thus, it may be seen that the scaled particle theory can be used to estimate the salt effect of polar solvents in nonaqueous systems.

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    Scaled particle theory for the ethyl acetate (1) + ethanol (2) + salt (3) system. This material is available free of charge via the Internet at

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