Vapor-liquid equilibrium for salt containing systems: Correlation of binary solvent data and prediction of behavior in multicomponent solvents

Authors

  • R. W. Rousseau,

    Corresponding author
    1. Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27607
    • Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27607
    Search for more papers by this author
  • J. E. Boone

    1. Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27607
    Search for more papers by this author

Abstract

When salts or electrolytes are encountered in the design of separation equipment, the effects of these electrolytes on the vapor-liquid equilibrium behavior of nonelectrolytes are often neglected. This is the case because there has not been a method for the correlation of data for salt containing systems which can be used for varying salt and solvent compositions. Boone, Rousseau, and Schoenborn (1976) proposed a method for correlating data from binary solvent-salt systems which are not restricted in this manner. This work proposes an extension that correlates phase equilibrium behavior using the Prausnitz UNIQUAC equation, which can be used for systems having regions of immiscibility. In addition, the model used for binary solvent systems is extended to multisolvent salt systems, and it is shown that vapor-liquid equilibrium data for these systems can be predicted from data on binary solvent-salt systems.

Ancillary