Showing papers in "Fluid Phase Equilibria in 1997"

TL;DR: In this paper, the P-x-y diagrams for carbon dioxide + methanol, carbon dioxide+ ethanol, and carbon dioxide plus acetone were determined by a novel technique of density measurement at 291, 298, 303, 308, 313 K, and pressures up to 8 MPa.

TL;DR: In this paper, a vanishing interfacial tension (VIT) technique is presented to enable rapid and cost-effective determination of minimum miscibility pressure and composition, which can be applied to optimize injection gas composition for an Alberta field project.

TL;DR: In this paper, experimental techniques for the determination of infinite dilution activity coefficients and their improvements are reviewed, and the most extensively used gas-liquid chromatographic method can be divided into the stationary phase GLC, non-steady-state GLC and relative measurement GLC.

TL;DR: In this paper, the authors present experimental values of the density, refractive index, speed of sound, and dynamic viscosity of the binary mixtures (methanol, ethanol or 1-propanol) with (n-pentane, n-hexane, N-heptane, and n-octane) at 298.15 K and atmospheric pressure, as a function of the molar fraction.

TL;DR: In this article, the solubility of pure water was measured at low temperatures and moderate pressures below the gas hydrate forming conditions, within the experimental accuracy, Henry's law was obeyed according to the Krichevsky-Kasarnovsky relation.

TL;DR: In this article, the authors extended the Cubic-Plus-Association Equation of State (CPA EoS) to binary systems containing one associating compound (alcohol) and an inert one (hydrocarbon).

TL;DR: In this paper, experimental hydrate dissociation data for cyclopentane and neophane in their binaries and ternaries with methane or/and nitrogen over a wide range of temperature (282-301 K and 276-293 K, respectively) have been reported.

TL;DR: In this article, three-phase equilibrium conditions (aqueous liquid-vapor-hydrate) of four pure gases, five binary, five ternary mixtures and five natural gases were measured in a high-pressure cell applying the isochoric method.

TL;DR: In this article, experimental three phase (aqueous liquid solution, vapor and incipient solid hydrate) equilibrium data for two mixtures of methane and CO 2 in the presence of methanol, ethylene glycol and electrolytes were obtained.

TL;DR: In this paper, a two-Yukawa function was developed for the structure and thermodynamic properties of the Lennard-Jones fluid, utilizing the new function, and the results from the expressions developed are satisfactorily compared with the Monte Carlo simulation data, the theory of Weeks et al and the latest 33-parameter equation of state (EOS).

TL;DR: In this paper, the short-range interactions were described by SRK-EOS coupling with van der Waals on fluid mixing rules, while the long-range interaction were represented by the modified Debye-Huckel model.

TL;DR: In this paper, K-value formulations are developed for use in performing vapor-liquid equilibria (VLE) calculations on Fischer-Tropsch (F-T) systems.

TL;DR: In this article, the authors measured the solubility of β-carotene in supercritical carbon dioxide and nitrous oxide using a dynamic multi-pass flow system and compared the results with data from the literature.

TL;DR: In this article, a UNIFAC-based model is proposed to describe experimental thermodynamic properties of aqueous and non-aqueous solutions containing common sugars, e.g., d -glucose, d -fructose and sucrose.

TL;DR: In this article, the Cubic Plus Association Equation of State (CPA EoS) is applied to liquid-liquid equilibrium (LLE) calculations in alcohol hydrocarbon mixtures, which combines the physical term of the classical SRK EoS with the association term based on the perturbation theory of Wertheim.

TL;DR: In this article, a series of fluoroether amphiphiles have been developed to address the solubility problem of carbon dioxide as a processing fluid are primarily attributed to its insolubility of polar compounds.

TL;DR: A flow mixing unit using a SETARAM C-80 calorimeter, developed for measuring the enthalpy of solution of two fluids, has been used to measure enthalpies of absorption of carbon dioxide in a 30 wt.% aqueous solution of methyldiethanolamine (MDEA) at three temperatures 313.15, 353, 393, and three pressures 2.0, 5.0 and 10.0 MPa as mentioned in this paper.

TL;DR: In this article, a temperature dependent volume correction is proposed which can match the true critical point of the pure component, and provides accurate densities for polar and non-polar pure substances both near to and far from the critical point.

TL;DR: Based on the similarity between P-v-T and T-μ-P relationships, viscosity (μ) models for pure hydrocarbons (mainly for n -alkanes) have been developed from the three-parameter Patel-Teja (PT) and twoparameter Peng-Robinson (PR) cubic equations of state, and have been successfully extended to hydrocarbon mixtures containing defined components as well as undefined C 7 + -fraction as mentioned in this paper.

TL;DR: In this article, the critical temperatures and the critical pressures of normal alkanes were derived using the pulse-heating method of a wire probe immersed in the liquid under investigation applicable to thermally unstable substances.

TL;DR: In this article, the authors used the gradient theory of inhomogeneous fluids to calculate interfacial tensions (IFTs), which can improve the scaling behavior of pure hydrocarbons under near-critical conditions.

TL;DR: In this paper, 10 new main groups for the gases SO 2, NO, N 2 O, He, Ne, Kr, Xe, HCl, HBr and SF 6 have been added to the already existing 59 main groups.

TL;DR: In this article, a new method for directly computing phase equilibria for quantum fluids is presented, which is a combination of the path integral formalism with the Gibbs ensemble technique.

TL;DR: In this paper, a perturbed hard-sphere chain (PHSC) equation of state was developed for normal fluids and polymers, including mixtures, based on the analytic solution by Chang and Sandler to the second-order perturbation theory of Barker and Henderson for the square well fluid of variable width.

TL;DR: In this article, the group contribution-associating-equation of state (GCA-EOS) was applied for modeling high pressure phase equilibrium of mixtures containing gases and associating fluids.

TL;DR: In this article, the Kelvin equation is generalized by applying it to a case of a multicomponent non-ideal mixture, which is necessary to describe the two-phase equilibrium in a capillary medium with respect to both normal and retrograde condensation.

TL;DR: In this paper, a parametric crossover equation of state for pure fluids and binary mixtures, which incorporates the scaling laws asymptotically close to the critical point and is transformed into the regular classical expansion far away from critical point, is proposed.

TL;DR: In this article, a group contribution method is proposed for estimating the critical properties and acentric factors of paraffins, naphtenes and aromatics with emphasis on extrapolating to very heavy compounds.

TL;DR: In this article, a systematic approach is proposed for estimating the solubility parameter of a system, which is based on the original definition of cohesive energy density and solubile parameter, and the potential energy and volume V of the system are obtained from a simple equation-of-state model.

TL;DR: In this article, a new two-parameter model was presented for correlating the viscosity data of pure saturated liquids in a wide temperate range, and the correlation relates the visosity, a non-equilibrium property, to equilibrium properties.