Vapor-Liquid Equilibrium

EOS++ provides a comprehensive set of equations of state models which can be used to model most processes found in the hydrocarbon processing industry:

Peng-Robinson	Standard Peng-Robinson Equation Of State
Advanced Peng-Robinson	Peng-Robinson Equation Of State Recomended for Natural Gas, Refinery and Petrochemical Systems
Natural Gas-Liquids Peng-Robinson	Implementation of Peng-Robinson as specified by the GPA
Gibbs Excess Peng-Robinson	Implementation of Peng-Robinson with accurate polar compounds vapor pressures and Huron-Vidal mixing rules
Redlich-Kwong	Redlich-Kwong equation of state
Soave-Redlich-Kwong	Standard Soave-Redlich-Kwong equation of state
Refinery Soave-Redlich-Kwong	Implementation of Soave-Redlich-Kwong as specified by the American Petroleum Institute
Natural Gas Compressibility Factor Soave-Redlich-Kwong	Implementation of SRK for the calculation of natural gas mixtures compressibility factors
Predictive Soave-Redlich-Kwong	Implementation of SRK using UNIFAC
NIST Steam Tables	Extension of NIST's standard steam tables
Virial Hayden-O'Connell	Implementation of Hayden-O'Connell's virial equation of state

The model parameters are a function of temperature for added flexibility when simultaneously modeling VLE and LLE.



Important polar compounds found in normal hydrocarbon processing such as water, methanol and ammonia are rigorously handled. Supercritical gases such as helium and hydrogen are properly handled and their behavior extrapolated to normal processing conditions.