Measurements of Isothermal Vapor–Liquid Equilibrium and Critical Point-Based Perturbed-Chain Statistical Association Fluid Theory Phase Behavior Modeling of the Propane + Phenol and Tetracosane + Propane/n-Butane Mixtures (original) (raw)
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Fluid Phase Equilibria, 2002
Isothermal vapor-liquid equilibrium (VLE) data for the propane + 1,1,1,2,3,3,3-heptafluoropropane (R227ea) binary system were measured at 293. 16, 303.14, 313.14, 333.15, 343.16 and 353.18 K and pressures up to 3.5 MPa. The experimental method, used in this work, is of the static-analytic type. It takes advantage of two pneumatic capillary samplers (Rolsi TM , Armines' patent) developed in the Cenerg/TEP laboratory. The peculiarity of R227ea-propane binary system is to present azeotropic behavior at each studied temperature.
Journal of Chemical & Engineering Data, 2017
Isothermal vapour-liquid equilibrium data for the system of hexafluoroethane (R-116) + nbutane are reported in this paper. The measurements were undertaken at six different temperatures ranging from 273.27 to 323.19 K, with pressure ranging from 0.104 to 3.742 MPa. Two of the temperature sets were measured below, and the remaining four were measured above the critical temperature of R116. The measurements were performed in a "static-analytic" type VLE apparatus. The sampling of the equilibrium phases was performed via pneumatic ROLS® capillary samplers (Armine's patent). The equipment was developed in the CEP/TEP laboratory at MINES ParisTech. Combined expanded uncertainties in the measurements were estimated to be 0.02 K for temperature, 0.0006 MPa for pressure, and 0.004 for composition, based on the NIST guidelines. Each set of isothermal vapour-liquid equilibrium data was correlated with the Peng-Robinson equation of state (PR-EOS). The
Fluid Phase Equilibria, 2004
Since ethyl acetate and n-heptane can form the lowest azeotropic mixture, p-xylene and butyl butyrate were selected as extracting agents to separate the azeotrope (ethyl acetate + n-heptane) using extractive distillation. The binary isobaric vapour-liquid equilibrium (VLE) data for the binary systems (ethyl acetate + p-xylene), (ethyl acetate + butyl butyrate) and (n-heptane + butyl butyrate) were determined at 101.3 kPa using a Rose-Williams still. The measured experimental data were checked by the van Ness method and Herington test. Besides, the determined VLE data were fitted by the NRTL, UNIQUAC and Wilson thermodynamic models. The calculated root-mean-square deviation values of the temperature and vapour phase mole fraction are no more than 0.19 K and 0.0053, respectively. The results showed that three thermodynamic models can be used to correlate the determined experimental data for the three binary systems. Meanwhile, the binary interaction parameters for the three thermodynamic models were optimized, which are a great help for the optimization and simulation of separating the azeotropic mixture (ethyl acetate + n-heptane).
Journal of Chemical and Engineering Data, 2005
Binary vapor-liquid equilibrium data were measured for the n-butane (HC-600) + difluoromethane (HFC-32), + pentafluoroethane (HFC-125), 1,1,1,2-tetrafluoroethane (HFC-134a) systems at temperatures from 313.15 K to 333.15 K. These experiments were carried out with a circulating-type apparatus with on-line gas chromatography. The experimental data were correlated well with the Peng-Robinson equation of state using the Wong-Sandler mixing rules.
Vapor−Liquid Equilibrium for the Difluoromethane (R32) + n -Butane (R600) System
Journal of Chemical & Engineering Data, 2005
Vapor-liquid equilibria (VLE) for the difluoromethane (R32) + n-butane (R600) system that shows liquidphase immiscibility below 246 K were measured at (263.15, 278.15, and 293.15) K by means of a static analytical method. The (T-P-x-y) VLE data were correlated using various equations of state and various mixing rules to compare the ability of these models to correlate data for this strongly nonideal system. The correlation of the VLE data and published VLLE data shows that the system is azeotropic at temperatures higher than the upper critical end point, UCEP, (246 K), heterohomoazeotropic between (246 and 230) K, and heteroazeotropic below 230 K. A comparison with the available VLE data in the literature was performed.
Vapor Liquid Equilibrium for Six Binary Systems of C 4 -Hydrocarbons + 2-Propanone
Journal of Chemical & Engineering Data, 2006
Isothermal vapor-liquid equilibrium of the six binary systems 2-propanone + n-butane, + 2-methylpropane, + 1-butene, + cis-2-butene, + 2-methylpropene, + trans-2-butene were measured from (364.1 to 365.46) K with an automated static total pressure apparatus. Measured pTz data was reduced into pTxy data using the Barker method. Error analysis was conducted for all measured and calculated data. All measured systems exhibited positive deviation from Raoult's law, and an azeotropic point was found for the n-butane + 2-propanone system. Parameters of Wilson and UNIQUAC activity coefficient models were regressed with the experimental VLE data. Results obtained with two predictive methods, UNIFAC and COSMO-RS, were compared with measured data.
Fluid Phase Equilibria, 2013
The organic Rankine cycle (ORC) is one solution to recover energy from high temperature hot sources. It requires working fluid with high critical coordinate values. It is named for its use for an organic high molecular masse fluid with a liquid-vapor phase change. The knowledge of phase diagram of working fluid is a crucial task in refrigeration process. In this context, a new mixture of decafluorobutane (R3110) and 1,1,1,3,3-pentafluorobutane (R365mfc), is studied by means of experimental measurements and modeling procedures. The purpose is to obtain the isothermal vapor-liquid equilibrium data (R3110 + R365mfc) of binary system ranging from (333.26 to 441.61) K temperature, and (0.2016 to 3.0927) MPa pressure. The data were obtained with accurate within u(T, k = 2) = 0.02 K, u(P, k = 2) = 0.0003 MPa and u(z) = 0.004 for molar composition. In the present work, the static analytic method is another time investigated to achieve a high quality data as it was largely demonstrated previously by the team of our laboratories. The experimental data are correlated using the classical equations: Peng-Robinson equation of state, the Mathias-Copeman alpha function, and the Wong-Sandler mixing rules involving the NRTL model. The predicted critical line is well reproduced.
2010
This work presents experimental data of vapor-liquid phase behavior in the binary system of trifluoroethane (HFC-143a) + ethyl fluoride (HFC-161) with a single-phase circulation over the temperature range (253.15 to 303.15) K. The correlated results of the vapor-liquid equilibrium data with the Peng-Robinson (PR) equation of state (EoS), combined with the first Modified Huron-Vidal (MHV1) mixing rule and Wilson model, are presented. It is shown that there is a good agreement between the correlated results and the experimental data. The average and maximum absolute derivations of vapor mole fraction are within 0.0209 and 0.0437, respectively, and the average and maximum relative derivations of pressure are within 1.14 % and 2.88 %, respectively. In addition, from the correlation results, it is revealed that there is no azeotrope in the binary system, and the system exhibits from slightly negative deviations to slightly positive deviations when the temperature increases.
Journal of Chemical & Engineering Data, 2002
The research on the isothermal vapor-liquid phase behavior for the ethane (R170) + hexafluoroethane (R116) system is presented in this paper. The vapor-liquid equilibrium (VLE) data were measured at four temperatures 189. 31, 192.63, 247.63 and 252.80 K with an apparatus based on recirculation method. The experimental results were correlated with the Peng-Robinson equation of state using two types of mixing rules, the Panagiotopoulos-Reid mixing rule and the Huron-Vidal mixing rule involving the NRTL model. The calculated data using the regressed parameters were compared with the previous measured results, and good agreements can be observed.