Investigation on isobaric vapor liquid equilibrium for acetic acid + water + ( n-propyl acetate or iso-butyl acetate)

• Published in: Fluid phase equilibria Vol. 305; no. 1; pp. 68 - 75
• Main Authors: Zhang, Chundong, Wan, Hui, Xue, Lijun, Guan, Guofeng
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.06.2011; Elsevier
• Subjects: Acetates; Acetic acid; Chemistry; Computational fluid dynamics; Exact sciences and technology; Fugacity; General and physical chemistry; Iso-butyl acetate; Least squares method; Liquid-vapor equilibria; Liquids; Mathematical models; n-Propyl acetate; Phase equilibria; Vapor–liquid equilibrium; Iso-butyl acetate; Vapor–liquid equilibrium; Acetic acid; n-Propyl acetate; Water; Ternary system; Vapor-liquid equilibrium; Isobar; Thermodynamic model; Liquid vapor equilibrium; Phase equilibrium
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/j.fluid.2011.03.006

► Isobaric VLE data for acetic acid + water + ( n-propyl acetate or iso-butyl acetate) at 101.33 kPa have been measured. ► The thermodynamic consistency of all binary experimental data has been tested by the Herington and Fredenslund method. ► The nonideal behavior in vapor phase have been corrected by the chemical theory. Isobaric vapor–liquid equilibrium (VLE) data for acetic acid + water, acetic acid + n-propyl acetate, acetic acid + iso-butyl acetate, acetic acid + water + n-propyl acetate, acetic acid + water + iso-butyl acetate are measured at 101.33 kPa with a modified Rose still. The nonideal behavior in vapor phase caused by the association of acetic acid are corrected by the chemical theory and Hayden–O’Connell method, and analyzed by calculating the second virial coefficients and apparent fugacity coefficients. The VLE data for acetic acid + water, acetic acid + n-propyl acetate, and acetic acid + iso-butyl acetate are correlated through the NRTL and UNIQUAC models using the nonlinear least square method. The obtained NRTL model parameters are used to predict the ternary VLE data. The ternary predicted values obtained in this way agree well with the experimental values.