Van Der Waals Equation
Mostrando 13-20 de 20 artigos, teses e dissertações.
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13. Modeling the high-pressure behavior of binary mixtures of carbon dioxide+alkanols using an excess free energy mixing rule
The behavior of binary mixtures of carbon dioxide+alkanol (1-butanol, 2-butanol, 1-pentanol, or 2-pentanol) at high pressures was modeled using the Stryjek-Vera version of the Peng-Robinson equation of state. Two mixing rules were compared for this purpose: the classical one-fluid van der Waals and the Wong-Sandler mixing rules. In the case of the latter mix
Brazilian Journal of Chemical Engineering. Publicado em: 2004-12
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14. Modelagem do equilibrio de fases em misturas de dioxido de carbono supercritico e compostos presentes em produtos naturais / Phase equilibria modeling of mixtures of supercritical carbon dioxide and compounds present in natural products
Modeling and simulation of supercritical extraction processes request a good prediction of conditions of phase equilibrium, conditions that determine the higher concentration of liquid or solid (solute) to be extracted by supercritical fluid (solvent). The main problem in modeling of systems found in supercritica1 extraction processes is the great size diffe
Publicado em: 2002
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15. Equilibrio liquido-vapor utilizando uma nova relação P-V-T cubica
A new cubic P-V-T relation is proposed in order to calculate thermodynamic properties of purê components and multicomponent system in conditions of vapor-liquid equilibria,. The ralation is suitable for applicatios to system involving non-polar and polar compounds. The new equation also predicts both the low and high prossure ranges of the equilibrium diagr
Publicado em: 1993
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16. One- and Two-Fluid van der Waals Theories of Liquid Mixtures, II. 6:12 Molecules*
The equation of state of mixture of 6:12 molecules is calculated using the one- and two-fluid van der Waals theories, the three-fluid theory, and the Flory theory. The one-fluid van der Waals theory is found to be in the best agreement with the quasi-experimental, machine-simulation results.
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17. One- and Two-Fluid van der Waals Theories of Liquid Mixtures, I. Hard Sphere Mixtures*
The equation of state of a mixture of hard spheres is calculated using the one- and two-fluid van der Waals theories and the three-fluid theory. The one-fluid theory is found to be in the best agreement with the machine-simulation results.
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18. A van der Waals-type equation of state for fluids with associating molecules
The basic assumptions of van der Waals theory are contained in two well-known concepts: excluded volume (repulsive forces) and a homogeneous, isotropic field potential (attractive forces). We have superimposed on these, one more well-known concept: the existence of dimers, trimers, etc., at chemical equilibrium. With reasonable simplifying assumptions, we ob
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19. Evaporation and instabilities of microscopic capillary bridges
The formation and disappearance of liquid bridges between two surfaces can occur either through equilibrium or nonequilibrium processes. In the first instance, the bridge molecules are in thermodynamic equilibrium with the surrounding vapor medium. In the second, chemical potential gradients result in material transfer; mechanical instabilities, because of v
The National Academy of Sciences.
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20. Binding of small basic peptides to membranes containing acidic lipids: theoretical models and experimental results.
We measured directly the binding of Lys3, Lys5, and Lys7 to vesicles containing acidic phospholipids. When the vesicles contain 33% acidic lipids and the aqueous solution contains 100 mM monovalent salt, the standard Gibbs free energy for the binding of these peptides is 3, 5, and 7 kcal/mol, respectively. The binding energies decrease as the mol% of acidic