Showing papers in "Fluid Phase Equilibria in 1990"

TL;DR: In this paper, a new explicit mixing rule for a cubic equation of state has been developed, which enables direct incorporation of parameters from existing g E correlations, such as the Wilson equation, the NRTL equation or the UNIFAC equation.

TL;DR: In this article, a translated form of the van der Waals (t-vdW) and of the Peng-Robinson equation of state (EoS) is presented for the C1 to C20 n-Alkanes.

TL;DR: In this paper, a procedure for incorporating information from an excess Gibbs energy model into an equation of state is described, where the gE model is used to define mixing rules for an equation-of-state mixture parameter.

TL;DR: In this paper, the phase behavior of fluid mixtures at high pressure has received great attention over the past decade and the importance of high pressure fluid phase equilibria has now assumed in some industrial areas.

TL;DR: In this paper, a thermodynamic consistency test of vapor-liquid equilibrium data at low pressure has been proposed which permits the over-all check of the data by combining three tests; i) point test and ii) area test based on the generalized Gibbs-Duhem equation, and iii) infinite dilution test on the related thermodynamic equations.

TL;DR: In this article, the LDC Analytical SPA extractor was used to measure the equilibrium solubility of pure crystalline β-carotene in supercritical CO2.

TL;DR: In this article, the performance of equation-of-state methods for the representation of phase equilibria in multicomponent systems is evaluated with respect to their capability of representing pure component properties in the saturation region.

TL;DR: In this paper, the critical temperatures and densities of n-alkanes from pentane to octadecane have been measured using a rapid heating sealed ampoule technique.

TL;DR: In this article, an approach for introducing excess free energy models into mixing rules for cubic equations of state where the "standard state" for the mixing process is zero pressure is presented. But this approach is restricted to three-phase and azeotropic systems.

TL;DR: In this article, two new correlations based on the hole theory of long chain molecules were developed in order to fit the data within experimental error for the higher members of the homologous series and were generally found to be unsatisfactory.

TL;DR: In this paper, the solubility of hydrogen sulfide, carbon dioxide, methane, and ethane in sulfolane has been determined at temperatures in the range 25° to 130°C at pressures up to 7.6 MPa.

TL;DR: In this paper, the authors present a theoretical analysis of the partial molar volumes of binary mixtures in which one component is at the limit of infinite dilution, based upon the Percus-Yevick integral equation theory applied to mixtures, in which the intermolecular forces are modeled using Lennard-Jones 12-6 potentials.

TL;DR: In this article, the extended UNIQUAC model with binary and ternary parameters is modified to include additional quaternary parameters for correlating quaternaries liquid-liquid equilibrium data.

TL;DR: In this article, the potential parameters were determined using a WCA-type perturbation theory by fitting to the vapour pressure and the saturated liquid density at one temperature, and the agreement of the calculated pressures with the experimental pressures is on a gas isochore within ± 0.1 MPa, on two liquid isochores within ± 1 MPa and on a supercritical isotherm within ± 2% up to 1000 MPa.

TL;DR: In this paper, a generalized heat flux Calvet calorimeter, modeled after its Mraw-Kleppa (1984) modification, was used to study the calorimetry of a gas hydrate under free surface and porous media environments.

TL;DR: In this paper, a standard low pressure VLE data set has been developed for testing new VLE models and a total of 104 binary systems have been selected and divided into groups according to the polarity of the components and whether they form ideal or non-ideal systems.

TL;DR: In this article, the apparent molar volumes of citric, oxalic and lactic acids and di-sodium hydrogen citrate were determined in aqueous solutions at 298.15 K.

TL;DR: In this paper, Tsonopoulos's 1974 second virial coefficient correlation is reviewed, with particular emphasis on the dependence of the polar parameter a on the reduced dipole moment, and the 1974 recommendation is discarded in favor of a = −0.0109.

TL;DR: In this paper, a group contribution molecular model for thermodynamic properties of polar and non-polar liquids and their solutions is presented, including energy of vaporization, pVT relationships, excess properties and activity coefficients.

TL;DR: In this paper, the vapor critical states of water + n-decane at pressures up to 230 bar were determined at the temperatures studied, and liquid critical states were determined in disjoint regions at 573.2, 593.2 and 613.2 K.

TL;DR: In this article, the liquid-liquid-vapor (LLV) phase equilibrium loci for the binary mixtures of nitrous oxide + n-octanol, n-hexadecanol and n-decanol were investigated using a visual cell (stoichiometric) technique.

TL;DR: In this article, the authors studied the liquid-liquid-vapor (LLV) locus for the binary mixtures of n-propanol, n-butanol, ethane + n-octanol, and n-decanol.

TL;DR: In this article, an analytical equation for a mixture of hard-sphere ions and dipoles in the mean spherical approximation is presented. But the accuracy of the calculated values varies from 0.5 to 1.5% over the whole range of temperature, pressure and concentration.

TL;DR: In this paper, a static apparatus for the determination of total vapour pressure isotherms of mixtures has been tested and the accuracy of prediction of HE from two (P, x isotherm) was also studied.

TL;DR: In this paper, the authors measured selectivities and selectivities for hydrocarbon solids in pure and mixed supercritical fluids near multicomponent upper critical end points (UCEPs).

TL;DR: Based on the computer simulations of others of square-well mixtures, a predictive model for the coordination numbers has been proposed in this article, and its modification have been extensively tested, and compared with the low density, Lee-Sandler and Lee-Chao models in terms of Monte Carlo simulation data.

TL;DR: In this paper, a simple perturbation term for the Carnahan-Starling (CS) hard-sphere reference equation of state (EOS) is presented, which represents the critical isotherms of eight fluids with the lowest deviations in density and pressure.