Aspen Physical Property System - Physical Property Models

The apparent fugacities and partial molar enthalpies, Gibbs energies and
entropies of H2S and CO2 are calculated by standard thermodynamic
relationships. The chemical reactions are always considered.
The values of the coefficients for the seven equilibrium constants (A1i, ... A5i)
and for the two Henry's constants B1i and B2i are built into the Aspen Physical
Property System. The coefficients for the equilibrium constants were
determined by regression. All available data for the four amines were used:
monoethanolamine, diethanolamine, disopropanolamine and diglycolamine.
You are not required to enter any parameters for this model.
References
R.L. Kent and B. Eisenberg, Hydrocarbon Processing, (February 1976),
pp. 87-92.
Maxwell-Bonnell Vapor Pressure Model
The Maxwell-Bonnell model calculates vapor pressure using the Maxwell-
Bonnell vapor pressure correlation for all hydrocarbon pseudo-components as
a function of temperature. This is an empirical correlation based on API
procedure 5A1.15, 5A1.13. This model is used in property method MXBONNEL
for calculating vapor pressure and liquid fugacity coefficients (K-values).
References
API procedure 5A1.15 and 5A1.13.
Solid Antoine Vapor Pressure Model
The vapor pressure of a solid can be calculated using the Antoine equation.
Parameters for some components are available for the extended Antoine
equation from the Aspen Physical Property System pure component databank.
This equation can be used whenever the parameter PSANT is available.
The equation for the solid Antoine vapor pressure model is:
Extrapolation of ln pi *,s versus 1/T occurs outside of temperature bounds.
Parameter
Name/
Element
190 2 Thermodynamic Property Models
Symbol Default MDS Lower Limit Upper
Limit
Units
PSANT/1 C 1i — x — — PRESSURE,
TEMPERATURE
PSANT/2 C 2i — x — — TEMPERATURE
PSANT/3 C 3i 0 x — — TEMPERATURE
PSANT/4 C 4i 0 x — — TEMPERATURE
PSANT/5 C 5i 1000 x — — TEMPERATURE