Journal ArticleDOI
Gibbs energy analysis of phase equilibria
L.E. Baker,A.C. Pierce,K.D. Luks +2 more
TLDR
In this paper, a self-consistent method for determining whether a predicted equilibrium state is false is presented, which makes use of the equation of state to calculate the Gibbs energy surface and the tangent plane corresponding to the predicted equilibrium solution.Abstract:
For fluid systems that exhibit multiple phases, an equation of state may predict false phase equilibrium solutions. This paper presents a self-consistent method for determining whether a predicted equilibrium state is false. The method makes use of the equation of state to calculate the Gibbs energy surface and the tangent plane corresponding to the predicted equilibrium solution. If the tangent plane lies above the Gibbs energy surface at any point, the predicted equilibrium solution is false. Conversely, if the plane lies entirely below or tangent to the Gibbs energy surface, the solution does describe the equilibrium state.read more
Citations
More filters
Journal ArticleDOI
The isothermal flash problem. Part I. Stability
TL;DR: In this article, a number of numerical methods for stability analysis based on Gibbs' tangent plane criterion are described, which are applicable for both single phase and multiphase systems, mainly for Equation of State calculations using a single model for all fluid phases.
Journal ArticleDOI
The negative flash
TL;DR: In this article, the authors describe a procedure for calculating vapor-liquid equilibrium for systems that physically exist as a single phase, but still yield nonnegative equilibrium compositions that satisfy the material balance and equal fugacity constraints of the P-T flash.
Journal ArticleDOI
Phase equilibria of oil, gas and water/brine mixtures from a cubic equation of state and henry's law
Yau-Kun Li,Long X. Nghiem +1 more
TL;DR: In this paper, the phase equilibria of oil, gas and water/brine mixtures are modeled by a cubic equation of state and where the gas solubility in the aqueous phase is estimated from Henry's law.
Journal ArticleDOI
Modeling Liquid−Liquid Equilibrium of Ionic Liquid Systems with NRTL, Electrolyte-NRTL, and UNIQUAC
TL;DR: In this paper, three different excess Gibbs free energy models are evaluated to predict ternary liquid-phase behavior in systems that contain ionic liquids (ILs) from binary measurements.