Phase equilibria calculations for ill‐defined mixtures using the prsv equation of state

Abstract

A method for the calculation of vapor-liquid equilibria (VLE) for multicomponent systems using continuous thermodynamics is presented. The Extended Spline Fit Technique (ESFT) is used to represent the molar distribution curve of petroleum fluids. A continuous version of the Peng-Robinson-Stryjek-Vera (PRSV) equation of state (EOS) with Generalized Single Carbon Number Properties (GSCNP) is utilized. For continuously distributed components, following the suggestion of Hendriks (1987), the number of equations solved is reduced through integration over the range of the distributing variable using Legendre-Gauss quadrature. Integrated equations are solved using accelerated successive substitution. Flash, dew and bubble point calculations for an imaginary and a real system yield satisfactory results.On prCsente une mCthode de calcul des Cquilibres liquide-vapeur pour des systkmes multicomposantes au moyen de la thermodynamique continue. La technique de calage par spline Ctendue est utiliste pour reprCsenter la courbe de distribution molaire des fluides de petrole. Une version continue de I'Bquation d'Ctat Peng-Robinson, Stryjek-Vera est utilisCe avec les propriCtts du nombre de carbone simples gCnCralisCes. Pour les composantes distribukes de faGon continue, suivant la suggestion de Hendriks (1987), le nombre d'bquations est rBsolu par intCgration dans la garnme de la variable de distribution, au rnoyen d'une quadrature de type Gauss-Legendre. Les Bquations inttgrCes sont resolues par substitution successive accBlCrCe. Les calculs de point eclair, de point de rosCe et de point de bulle pour un systkrne imaginaire et un systkme rCel donnent des rCsultats satisfaisants.

Prediction of Vapor-Liquid Equilibria Using Peng-Robinson and Soave-Redlich-Kwong Equations of State

“…Several papers have followed the initial attempts of Stryjek and Vera [21±23] which have evaluated parameters for the PRSV EoS. Proust and Vera [47], Cheluget and Vera [48] and recently Ghosh and Taraphdar [49] have listed the PRSV parameters for a wide variety of compounds. The thermodynamic information required for the pure compounds for evaluating the parameters are available in several collections like the compilation by Daubert and Danner [50] which contains a wide information base with pertinent references.…”

Prediction of Vapor-Liquid Equilibria Using Peng-Robinson and Soave-Redlich-Kwong Equations of State

“…(1)). Proust and Vera [47], Cheluget and Vera [48] and recently Ghosh and Taraphdar [49] have listed the PRSV parameters for a wide variety of compounds. Several papers have followed the initial attempts of Stryjek and Vera [21±23] which have evaluated parameters for the PRSV EoS.…”