Experimental Isobaric Vapor−Liquid Equilibrium Data for Binary Mixtures of Cyclic Ethers with (1-Methylethyl)benzene

Abstract

Isobaric vapor−liquid equilibrium (VLE) measurements are reported for binary mixtures of tetrahydrofuran and tetrahydropyran with (1-methylethyl)benzene at 97.3 kPa. The data were obtained using a vapor recirculating-type (modified Othmer’s) equilibrium still. Both mixtures show negative deviation from ideality. None of the systems form an azeotrope. The experimental data obtained in this study are thermodynamically consistent according to the Herington and Black tests. The activity coefficients have been satisfactorily correlated by means of the Margules and NRTL equations. Excess Gibbs free energy has been calculated from the experimental data. The vapor−liquid equilibrium predictions have been done by the UNIFAC group contribution method too.

Comments on “Experimental Isobaric Vapor−Liquid Equilibrium Data for Binary Mixtures of Cyclic Ethers with (1-Methylethyl)benzene” (Gill, B. K.; Rattan, V. K.; Kapoor, S. J. Chem. Eng. Data 2008, 53, 2041−2043)

“…In addition, when there is a good fit of the residues of the equilibrium pressure, then an unreliable fit of the activity coefficients is obtained (as shown in Figure ). Finally, it is important to mention that no statistically significant consistency fit is able to match the experimental uncertainty of 0.27 kPa declared by Gill et al The above analysis does not change if a higher-order Legendre series is employed.…”

“…Activity coefficient plot for the system tetrahydropyran (2) + (1-methylethyl)benzene (3) at 97.3 kPa. ●, Experimental data of Gill et al; −, Calculated using a 1-parameter Legendre polynomial.…”

Vapor–Liquid Equilibrium, Densities, and Interfacial Tensions of the System Ethanol + Tetrahydro-2H-pyran

“…Ethanol (Merck) and tetrahydro-2 H -pyran (Aldrich) were used as received, without considering additional purification. Table reports the purity of the components (as determined by gas chromatography, GC), together with the normal boiling points of the pure fluids ( T b ), the mass densities (ρ), the refractive indexes ( n D ) at 298.15 K, and the interfacial tensions (σ) of pure fluids at 303.15 K. The reported values are also compared with those reported in the literature. − …”

“… a Daubert and Danner b Riddick et al c Giner et al d Gill et al e Interpolated data from Villares et al …”

Extractive distillation with the mixture of ionic liquid and solid inorganic salt as entrainers

“…Furthermore, the experimental data were assessed through thermodynamic consistency by applying the Herington area test (see Supporting Information for more details). [47][48][49] Similarly, isobaric VLE experiments were conducted to determine whether the mixtures of [ 2 and to determine the optimum solid inorganic salt. On this basis, the isobaric VLE data at 101.3 kPa were measured for the ternary system of ethanol (1) …”