Non-saturated mixture densities of the binary systems of carbon dioxide and the organic solvents ethanol, acetone, acetonitrile and dimethyl sulfoxide from 6-12 MPa (original) (raw)
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Journal of Chemical & Engineering Data, 1998
Vapor-liquid equilibrium data for binary systems containing methanol and ethyl esters, from methanoate to butanoate, are measured in a small recirculating still at 141.3 kPa and reported. Employing the same equilibrium still, the experimental vapor pressures are obtained for the ethyl esters considered here and correlated with a suitable equation. The densities and derived excess volumes for the same mixtures are also reported at 298.15 K. Azeotropes are found in the mixtures of methanol (1) + ethyl methanoate (2) and + ethyl ethanoate (2) at x 1 ) 0.337, T ) 333.7 K and x 1 ) 0.742, T ) 343.8 K, respectively. The data are correlated by using a new equation containing temperature-dependent coefficients. The estimates of various quantities including the excess enthalpies appear to be satisfactory. Activity coefficients calculated from experimental values are compared with those predicted by ASOG and UNIFAC groupcontribution models.
Journal of Molecular Liquids, 2007
Vapor-liquid equilibrium data for polar solvent-hydrocarbon mixtures are relatively plentiful for paraffins and aromatics; they are somewhat less plentiful for olefins. However, almost no data a t all have been published for such mixtures wherein the hydrocarbon possesses a triple bond. This paper reports vapor-pressure measurements of binary mixtures of I-hexyne with acetone, acetonitrile, dimethyl carbonate, nitroethane and dimethyl formamide in the temperature range 0 to 70°C. The results are compared with those for polar solvent-hydrocarbon mixtures wherein the hydrocarbon is paraffinic, olefinic, or aromatic.
Solubility data of a mixture containing 80.52 % ethanol and 19.48 % octane was measured in carbon dioxide solvent using a high-pressure type phase equilibrium apparatus at pressures up to 100 bar and at temperature of 75 °C. The experimental results showed that considerable separation was not achieved in this ethanol and octane ratio using carbon dioxide. From the point of view of the phase diagram for the current ternary system, the experimental results showed a closed loop. There was a two-phase region (vapor-liquid) in area (1) for ethanol-octane and CO 2 mixture. Furthermore, there was a one-phase region (liquid phase) in area (2) for the studied mixture. There also was a one-phase region (vapor phase) in area (3) for current mixture. According to the ethanol mole fractions extracted from the ternary system was investigated no effect of pressure on the solvent-free molar fraction of ethanol in both, the vapor and liquid phases. equilibria Many researchers have proven that carbon dioxide is chemically reactive toward alcohols, general oxygen-containing compounds and it also produces weak complexation in condensed mixtures of these substances . However, percentage of octane and ethanol extraction by high pressure CO 2 solvent increases with a decrease of pressure in the binary systems of CO 2 -octane and CO 2ethanol respectively, but extraction percentage of ethanol is more than octane at the same conditions . Furthermore, the azeotrope of the ethanol-octane systems occurs at around a ratio of ethanol: octane = 84: 16 [4], similar to the chosen ethanol-octane ratio in this study.
Liquids
Vapor–liquid equilibrium (VLE) and density data for binary systems of branched alkanes + ethyl acetate are scarce in the literature. In this study, the binary mixtures 3-methylpentane + ethyl acetate and 2,3-dimethylbutane + ethyl acetate were investigated. Density measurements at atmospheric pressure were performed using a vibrating tube density meter at 293.15, 298.15 and 303.15 K. Large and positive excess molar volumes were calculated and correlated using a Redlich–Kister-type equation. Isobaric VLE data at 101.3 kPa were obtained using a Gillespie-type recirculation ebulliometer. Equilibrium compositions were determined indirectly from density measurements. The experimental data were checked for consistency by means of the Fredenslund test and the Wisniak (L-W) test and were then successfully correlated using the NRTL model. The newly studied binary systems display high deviations from ideality and minimum boiling azeotropes, the coordinates of which are reported in this work.
Fluid Phase Equilibria, 2004
The statistical associating fluid theory (SAFT) equation of state is employed for the correlation and prediction of vapor-liquid equilibrium (VLE) of binary mixtures of alcohols with water, carbon dioxide, butane, hexane, benzene, and other alcohols. In addition, ternary VLE for water/ 1,2-propanediol (propylene glycol)/1,2-ethanediol (ethylene glycol), carbon dioxide/methanol/ ethanol, and water/1,3 propanediol/1,2,3-propanetriol (glycerol) mixtures is predicted. In the SAFT equation, three molecular parameters, the Lennard-Jones (L-J) potential well depth, the soft-sphere diameter of the segments, and the number of segments of the molecule, are needed. These parameters are obtained from the thermodynamic properties of pure substances. For selfassociating pure substances, two additional parameters are needed, namely, the bonding volume and the association energy. The binary interaction parameters are fitted to experimental vaporliquid equilibrium data for binary systems. These binary parameters are used to predict the phase equilibria for ternary mixtures without any additional adjustment. The results were found to be in good agreement with the experimental data.
Journal of Chemical & Engineering Data, 1999
ABSTRACT Excess molar enthalpies and excess molar volumes of binary mixtures containing ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, or poly(ethylene glycol)s (PEG200, PEG300, PEG400, and PEG600) + benzyl alcohol were determined at 308.15 K and at atmospheric pressure using a flow microcalorimeter and a digital density meter. Results were fitted to the Redlich-Kister polynomial to estimate the binary interaction parameters. The results are interpreted in terms of molecular interactions between the components.
Simulations are presented of the liquid-phase-vapor-phase equilibria of binary mixtures (methane + ethane, methane + carbon dioxide, ethane + carbon dioxide) and ternary mixtures (methane + ethane + carbon dioxide) in the Gibbs ensemble. Methane, ethane, and carbon dioxide are described with molecular models of the types 1CLJ, 2CLJ, and 2CLJQ, respectively. The equality of the chemical potentials in the two phases is maintained by transfer of the smallest molecule and exchange for the remaining molecules. The successful acceptance ratio of exchange is usually more than 10 times larger than that for transfer. The results are in relatively good agreement with experimental and other simulation data. S1089-5647(98)00094-7 CCC: $15.00
A Global Model to Predict Density of Non-Aqueous Binary Mixtures at Various Temperatures
2012
The combined form of the Jouyban-Acree model and the calculated Abraham solute parameters has been used to predict the density of binary solvent mixtures at various temperatures. The proposed model has been trained using 290 binary solvent systems at different temperatures (278.15 to 353.15 K) and concentration ranges. The results are discussed in terms of mean relative deviations (MRDs) between computed and experimental densities as an accuracy criterion. The MRD of the proposed model is 1.2 ± 1.9 %, indicating that the proposed model, together with the calculated Abraham parameters, is accureate to reproduce the concentration and temperature dependence of density values of binary solvent mixtures.