Generalized Correlations
The generalized correlations predict K-values with semi-rigorous methods. The Grayson-Streed and Chao-Seader methods use the Redlich-Kwong equation for the vapor fugacities and empirical correlations for the liquid fugacities. The Braun-K10 method uses a convergence pressure method. A variety of generalized correlations are used for the other properties, i.e., enthalpies, entropies and densities.
The following generalized correlations are available:
K-values: Braun-K10 method
Enthalpies: Johnson-Grayson method
Entropies: Curl-Pitzer method
Vapor densities: Ideal behavior
Liquid densities: API method
K-values: Grayson-Streed method
Enthalpies, entropies: Curl-Pitzer method
Vapor densities: SRK method
Liquid densities: API method
K-values: Improved-Grayson-Streed method
Enthalpies, entropies: Curl-Pitzer method
Vapor densities: SRK method
Liquid densities: API method
K-values: Grayson-Streed-Erbar method
Enthalpies, entropies: Curl-Pitzer method
Vapor densities: SRK method
Liquid densities: API method
K-values: Chao-Seader method
Enthalpies, entropies: Curl-Pitzer method
Vapor densities: SRK method
Liquid densities: API method
K-values: Chao-Seader-Erbar method
Enthalpies, entropies: Curl-Pitzer method
Vapor densities: SRK method
Liquid densities: API method
K-values: Vapor pressure/ System pressure
Enthalpies: Pure component liquid and vapor enthalpies
Entropies: None
Vapor Densities: Ideal Gas Law
Liquid Densities: Pure component saturated liquid density curves
Additional Information
Descriptions of the individual thermodynamic methods may be accessed from the Thermodynamic System - Modification Window by selecting the type of property, i.e., K-value, liquid enthalpy, etc., the method and pushing the Help button.
More detailed information can be found in PRO/II Reference Manual under the topic Generalized Correlation Methods.
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