Fluid Phase Equilibria Vapor–liquid equilibrium for the ternary carbon dioxide–ethanol–nonane and decane systems (original) (raw)
Related papers
Fluid Phase Equilibria, 2012
The vapor-liquid equilibrium (VLE) data of ternary systems (methane + n-decane + n-tetradecane) at ambient temperature and various pressures, 1-8 MPa, have been measured using a designed pressure-volume-temperature (PVT) apparatus. The phase compositions and saturated liquid phase properties, density and viscosity, have been measured for each pressure. The densities of three different (n-decane + n-tetradecane) binary mixtures have also been measured at ambient temperature over a wide range of pressures (1-10 MPa). The generated experimental data have been correlated with two cubic equations of state (EoS), Peng-Robinson (PR) and Soave-Redlich-Kwong (SRK). The binary interaction parameters and the volume shift values from the experimental information on the binary pairs, (methane + n-decane) and (methane + n-tetradecane), have been used to predict the VLE data of ternary system (methane + n-decane + n-tetradecane). Both equations of state have been found to be capable of describing the phase equilibria of binary pairs as well as ternary systems over the range of studied conditions.
The Journal of Supercritical Fluids, 2008
Vapor-liquid equilibria (VLE) data for the carbon dioxide + ethanol system at 293.15, 303.15, 313.15, 333.15, and 353.15 K up to 11.08 MPa are reported. The experimental method used in this work was a staticanalytical method with liquid and vapor phase sampling. The new experimental results are discussed and compared with available literature data. Measured VLE data and literature data for carbon dioxide + ethanol system were modeled with a general cubic equation of state (GEOS) using classical van der Waals (two parameters conventional mixing rule-2PCMR) mixing rules. A single set of interaction parameters was used to calculate the global phase behavior in the binary mixture carbon dioxide + ethanol in a wide range of temperatures (283.3-453.15 K).
J. Chem. Eng. Data, 2011
VaporÀliquid equilibria (VLE) data at (333.2, 343.2, 363.2, and 373.2) K and pressures between (1.1 and 14.1) MPa and critical data (pressureÀtemperatureÀcomposition) at pressures between (9.1 and 13.9) MPa for the carbon dioxide + ethanol system are reported. The experimental method used in this work was a static analytical method with liquid phase sampling using a rapid online sampler injector (ROLSI) coupled to a gas chromatograph (GC) for analysis. Measured VLE data and literature data for carbon dioxide + ethanol system were modeled with a general cubic equation of state (GEOS) using classical van der Waals (two-parameter conventional mixing rule, 2PCMR) mixing rules. A single set of interaction parameters, representing the critical pressure maximum (CPM) well, was used in this work to represent the new VLE data and critical points and to predict the densities of the mixtures in a wide range of temperature, pressure, and composition. The calculation results were compared to the new data reported in this work and to available literature density data. The results show a satisfactory agreement between the model and the experimental data.
High pressure vapor–liquid equilibrium for the ternary system ethanol/(±)-menthol/carbon dioxide
Journal of Supercritical Fluids, 2014
In this work the phase behavior of the ternary system ethanol/(±)-menthol /CO 2 was studied at the temperatures of 313 and 323 K, in the pressure range 8-10 MPa. Experiments were performed using a high pressure phase equilibrium apparatus with a visual cell. CO 2 is more selective towards ethanol, separation factors ranging from 1.6 to 7.6 at the conditions tested. The pTxy data obtained were correlated with the Peng-Robinson equation of state combined with the Mathias-Klotz-Prausnitz mixing rule. The model gave a good fitting to the data, with a total average absolute deviation of 3.7%, and was able to predict the occurrence of a threephase region observed experimentally at 313 K and 9 MPa.
Chemical Engineering Transactions, 2017
In this work, binary and ternary systems composed by hydrocarbons and CO2 in liquid-vapor equilibrium conditions (LV) were thermodynamically modeled using Peng-Robinson (PR) and Patel-Teja (PT) equations of state (EoS) in combination with van der Waals mixing rule with two adjustable parameters (vdW -2, kij and lij). The model was formulated as a minimization of the Mean Absolute Deviation (%AAD) between the predicted and experimental values for liquid and vapor phases using the simplex algorithm, through the software Phase- Equilibrium 2000 (PE-2000). Low deviations, %AAD = 2.33% for PR EoS and %AAD = 3.06% for PT EoS were observed for binary systems in the evaluation of 160 experimental points (EP). Ternary systems were modeled with low deviations too, %AAD = 1.12% for EoS PR and %AAD = 1.18% for EoS PT were observed in the evaluation of 69 EP. Both tested EoS proved to be useful to represent LV equilibrium in this kind of system.
Fluid Phase Equilibria, 2013
Isothermal vapor-liquid-liquid equilibrium data were measured for the ethanol + water + diethyl carbonate (DEC) ternary system and the constituent binaries using static headspace gas chromatography (HSGC) at 353.15 and 363.15 K. Multiple headspace extraction was used to calibrate the gas chromatograph. The activity coefficients were calculated using the Gibbs-Duhem equation and thermodynamic correlations. The thermodynamic consistency of the experimental vapor-liquid and vapor-liquid-liquid equilibrium data was verified. The experimental data were correlated using NRTL and UNIQUAC models, obtaining new UNIQUAC and NRTL interaction parameters for the VLE and VLLE.