Showing papers in "Fluid Phase Equilibria in 1985"

TL;DR: In this paper, experimental measurements have been made on the initial hydrate formation temperatures and pressures in systems containing methane, ethane, propane, carbon dioxide or hydrogen sulfide in the presence of methanol solutions.

TL;DR: Schmidt, R and Wagner, W, 1985 A new form of the equation of state for pure substances and its application to oxygen Fluid Phase Equilibria was presented and expressed analytically in the form of free energy as a function of density and temperature This fundamental equation contains, in addition to pure polynomial and BWR-terms, new exponential functions especially convenient for the critical region.

TL;DR: The reliability of the resulting Peng-Robinson equation for predicting volumetric and phase behavior is illustrated for complex hydrocarbon systems in this article, where modifications to improve the performance of the equation for two-and three-phase systems containing water are described.

TL;DR: In this paper, a formulation of the generalized van der Waals partition function derived earlier is used, together with insights obtained from computer simulation, to develop two new equations of state for the square-well fluid.

TL;DR: Nagata and Kawamura as mentioned in this paper used pure liquid association constants determined by the method of Brandani and a single value of the enthalpy of the hydrogen bond equal to −23.2 kJ mol −1 for pure alcohols.

TL;DR: Sandler et al. as discussed by the authors provided a new derivation of the generalized van der Waals partition function for pure fluids and mixtures, and showed how this partition function can be used as a basis for understanding equations of state, their mixing rules, and excess free energy (activity coefficient) models.

TL;DR: In this paper, the authors present a tool for recalculating exact excess quantities from erroneous data likely to be found in the literature, using examples taken from among the properties of the water-acetonitrile system.

TL;DR: In this article, a model of associated mixtures is proposed, in which a chemical contribution term described by an athermal associated model is combined with a physical contribution terms described by a Flory new theory formalism.

TL;DR: In this paper, the CO2/nC13H28 system is characterized by two liquid-liquid-vapor (l-l-g) loci, a lower liquid-upper liquid (l -l) critical branch extending from high pressures to the upper critical end point (UCEP), and two liquid vapor (lg) critical branches which cross near the lower critical end points (LCEP).

TL;DR: In this paper, an extended Soave-Redlich-Kwong equation of state with Mathias' polar correction factor has been used to describe the equilibrium behavior of these mixtures.

TL;DR: The behavior of two mixtures of CH 4, CO 2, H 2 S and H 2 O was studied over a temperature range from ≈37.8° to 204°C at pressures in the 0.4-18.5 MPa range as mentioned in this paper.

TL;DR: In this paper, the excess proerties of 2,2,4-trimethylpentane with several polar components of different polarity [acetonitrile, 2-butanone, bisdichloroethylether, t-butylchloride, chlorobenzene] have been determined.

TL;DR: In this paper, a static apparatus is described with the help of which vapour-liquid equilibria can be measured with a good precision particularly in the range of pressure 1-10 bar.

TL;DR: In this article, the vapour-liquid equilibrium of the system decane + CO 2 was investigated in the temperature range 343-402 K and at pressures between 100 and 200 bar, and the integrated molar absorptivities were found to be independent of pressure, temperature, and concentration within the limits of experimental error.

TL;DR: In this paper, a method for the calculation of approximate saturation temperatures or pressures for multicomponent mixtures with iteration in only a single variable is described, where errors with magnitude of order ∈ in the assumed composition of the incipient phase result in an error of order 2 only in the corresponding saturation temperature or pressure.

TL;DR: In this paper, the Mansoori-Carnahan-Starling expression is used for the repulsive part of the equation of state while the attractive part uses a simple van der Waals form.

TL;DR: In this article, the speeds and densities for binary solutions of n-alkanes were measured at 298.15 K under pressures up to the freezing line or 100 MPa.

TL;DR: In this article, it was shown that when the n-C n is replaced by the corresponding series of highly-branched alkane isomers, anomalous positive contributions occur in H E, S E and V E, but negative in C P E, ΔC v and ΔαγVT, dV E /dT and ΔγVT seem little affected.

TL;DR: In this article, the two and three phase boundaries for a mixture containing nominally 0.50 mole fraction methane, 0.10 mole fraction carbon dioxide and 0.40 mole fraction hydrogen sulfide were determined experimentally for a range of temperatures from c. 29 to − 83°C at pressures up to c. 13 MPa.

TL;DR: A classification of various techniques of experimental determination of the PVT properties of liquids and liquid mixtures is given in this paper, with a brief description of the methods and of the instruments.

TL;DR: In this paper, the vapour-liquid equilibria (VLE) determined by an ebulliometric total pressure method under isothermal conditions for binary systems formed by N -methylpyrrolidone with hexane (333.25 and 343.15 K), dodecane (393.75 and 393.35 K), propylbenzene (352.15 and 373.75

TL;DR: In this paper, the application of several recent modifications of the Redlich-Kwong equation of state to the calculation of thermodynamic and physical properties is discussed, and the strengths and weaknesses of these modifcations and outlines the limitations of simultaneously predicting these properties with a single cubic equation.

TL;DR: In this article, the effect of the molecular shape on the excess quantities is demonstrated for mixtures of spherical with linear molecules and an extension of the combining rule to nonspherical molecules is attempted.

TL;DR: In this article, a flow vibrating-tube densimeter for operation to high temperatures and pressures constructed at the University of Delaware has been used to investigate organic liquids, pure components as well as mixtures.

TL;DR: In this article, the authors describe the origin and development of the UNIFAC group-contribution method for predicting activity coefficients, and the many practical applications of this method, and its limitations and shortcomings are discussed.

TL;DR: In this paper, a method based on the Raoult's ideal solution model was developed to estimate differences arising from the use of such rigorous laws instead of relationships previously used for the calculation of excess quantities.

TL;DR: In this paper, a modified static method for the ternary systems methanol-chloroform-acetone and constituent binaries at 313.15 and 323.15 K was presented.

TL;DR: The data available in the literature for the excess enthalpies of ethanal, propanal and butanal were examined on the basis of DISQUAC, a simple extension of the quasi-chemical group contribution theory applied in Parts I and II to correlate and predict excess enthpies and excess Gibbs energies of n-alkanal+n-alkane mixtures as discussed by the authors.

TL;DR: The concept of local composition has received much attention during the past few years, much of which has been devoted to justifying the empirical model proposed by Wilson in 1964 as mentioned in this paper, and expressions relating these compositions to thermodynamic properties of equilibrium fluid mixtures are derived.

TL;DR: In this paper, a molecular-thermodynamic model was established for the solubilities of gases in nonpolar and polar solvents and in aqueous solutions of electrolytes.