Thermodynamic study of binary mixture of 2-butanol + monoethanolamine at different temperatures; PC-SAFT and ERAS models

Abstract

In this paper, to study the possible intermolecular interactions in the binary mixtures 2-butanol with monoethanolamine, values of density were measured at temperatures 293.15 to 323.15 K and atmospheric pressure (P = 0.0815 MPa). From experimental densities, values of excess molar volume, VmE thermal expansion coefficient, α excess thermal expansion coefficient, αE and isothermal coefficient of excess molar enthalpy, (∂HmE/∂P)T, x were calculated. Excess molar volume is negative for the mentioned binary mixture over the whole range of concentration and becomes more negative with the increase in the temperature. ERAS model with the six adjustable parameters was used to correlate the excess molar volumes at different temperatures. Agreement between experimental data and predicted values through this model was reasonable at all temperatures. The maximum standard deviation for the mentioned binary mixture was 1%. Also, PC-SAFT model with one adjustable parameter and different schemes (2B, 3B, 4C) was applied to correlate the binary densities. A comparison among the performance of three approaches shows that the scheme 3B-2B at 293.15 K with the average absolute deviation (AAD) 1.63% has the best agreement with experimental data. When the PC-SAFT model with the prediction ability (p = 0) was implemented, the minimum of AAD increased to 4.66%.