Chapter 3. Vapor-Liquid Equilibrium

  1. Bruce A. Finlayson

Published Online: 8 FEB 2006

DOI: 10.1002/0471776688.ch3

Introduction to Chemical Engineering Computing

Introduction to Chemical Engineering Computing

How to Cite

Finlayson, B. A. (2006) Vapor-Liquid Equilibrium, in Introduction to Chemical Engineering Computing, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/0471776688.ch3

Author Information

  1. University of Washington, Seattle, Washington, USA

Publication History

  1. Published Online: 8 FEB 2006
  2. Published Print: 27 FEB 2006

ISBN Information

Print ISBN: 9780471740629

Online ISBN: 9780471776680



  • isothermal flash;
  • adiabatic flash;
  • K-value;
  • Rachford-Rice equation;
  • fugacity;
  • activity coefficient;
  • fugacity coefficient;
  • partial pressure;
  • group contribution methods;
  • Henry's law;
  • Excel commands ‘Goal Seek’ and ‘Solver’;
  • MATLAB commands ‘fzero’ and ‘fsolve’;
  • Aspen Plus vapor-liquid equilibria


Excel, MATLAB, and Aspen Plus are demonstrated to solve for the vapor-liquid equilibrium of a mixture. The equations are developed in general, and then the computer programs are used to solve sample problems. Thermodynamic models include Redlich-Kwong-Soave, Wilson equation.