INVESTIGADORES
ZABALOY Marcelo Santiago
congresos y reuniones científicas
Título:
TOOLS FOR UNDERSTANDING THE FLUID-FLUID AND SOLID-FLUID EQUILIBRIA OF BINARY ASYMMETRIC MIXTURES
Autor/es:
S.B. RODRIGUEZ-REARTES; M. CISMONDI; L. CARDOZO-FILHO; M.S. ZABALOY
Lugar:
NATAL, BRAZIL
Reunión:
Conferencia; PROSCIBA 2010: II Iberoamerican Conference on Supercritical Fluids.; 2010
Institución organizadora:
Universidade Federal do Rio Grande do Norte – UFRN
Resumen:
Often in the literature the calculation of solid-fluid and fluid-fluid  equilibria for binary systems is limited to the ranges of conditions of the  experimental data on which the model parameters rely. However, a deeper  understanding of the possible qualitative behavior of the system under study  can be achieved by performing calculations at conditions well beyond those of  the experimental data. Due to the highly non-linear nature of some phase  coexistence boundaries, such as some isoplethic lines, the algorithms for  carrying out the calculations over a wide range of conditions should have the  ability of selecting, among the variables involved, the optimum one, i.e., the  variable that should be specified for calculating the next point on the curve.  This is a feature of the so called path-following methods. Such methods are  useful for calculating several types of phase equilibrium lines (critical, liquidliquid-  vapor, azeotropic, solid-fluid-fluid, isoplethic, isothermal, etc.). Three  phase lines are particularly important since they set limits of existence for  isothermal and/or isobaric and/or isoplethic hyper-lines. A given hyper-line  may meet more than one stable three-phase line. This implies that a hyper-line,  e.g., an isopleth, may be made of a number of segments of varying nature. In  this work, we couple a model applicable to fluid-fluid and solid-fluid  equilibria to a set of path-following methods, to study the rich phase behavior  of the binary system made of CO2 and n-Eicosane (C20H42). This system is  representative of the most complex binary systems that can be found. The  model assumes a solid phase only formed by the pure heavy component. The  fluid phases were described through the Peng-Robinson equation of state (PREOS).  The model is relatively simple but it can generate a wide variety of  phase behaviors.