Phase Equilibria - ChE Links

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AQUAlibrium
Software package by John Carroll for predicting fluid phase equilibria in natural gas-water systems; runs under DOS. Site also includes some excellent tutorials on phase equilibrium calculations and an introduction to gas hydrates.

ChemApp Light
Free version of ChemApp, programmer's library with subroutines for the calculation of multicomponent, multiphase chemical equilibria and the associated energy balances. Many versions for various compilers on DOS, Windows, Unix, and Macintosh platforms.

EQS4WIN Lite
Free Lite version of a program that solves equilibrium problems from a wide range of fields using the unified theoretical approach and algorithms of Smith and Missen. For MS Windows.

Fluid Phase Equilibria Page
From Quest Consultants, online calculator for the vapor pressure curve of a pure component or the pressure-temperature phase envelope of a mixture, uses the Peng-Robinson equation of state.

Gas-Vapor Phase Equilibrium Calculations
A mini-tutorial by W. R. Smith that discusses the calculation of dew-point temperatures and pressures in gas-vapor systems.

Henry's Law Constants (Solubilities)
List of data for more than 500 species in water. Available in postscript format, subdivided into small files, or as a plain ASCII text file.

MINEQL+, A Chemical Equilibrium Modeling System
Software for the calculation of chemical equilibria. Includes graphical display of output, calculation of acid/base, redox and precipitation reactions, surface adsorption calculations, synthetic titrations.

Multiflash
Commercial software from Infochem for multiphase equilibrium calculations using equation of state, activity coefficient and transport property models. Available as an interactive Windows program and as a DLL for linking to other Windows software.

Phase Equilibrium Diagrams
Introduction to solid-fluid equilibria (SFE) and phase diagrams, includes a Java applet illustrating ternary SFE phase diagrams.

VLECalc
From William D. Kovats, Windows 9x/NT program for vapor-liquid equilibrium calculation and batch distillation simulation using UNIFAC and NRTL, free for non-commercial and educational use, requires MS Excel 97 and Visual Basic 4 Runtime Library, 1.67 MB.

By: Dr. Bernhard Spang, Associate Content Writer (read the author's Profile)
b.spang@hamburg.de