Aspen Physical Property System - Physical Property Models

References
B.C. Cajander, H.G. Hipkin, and J.M. Lenoir, "Prediction of Equilibrium Ratios
from Nomograms of Improved Accuracy," Journal of Chemical Engineering
Data, vol. 5, No. 3, July 1960, p. 251-259.
J.M. Lenoir, "Predict K Values at Low Temperatures, part 1," Hydrocarbon
Processing, p. 167, September 1969.
J.M. Lenoir, "Predict K Values at Low Temperatures, part 2," Hydrocarbon
Processing, p. 121, October 1969.
Chao-Seader Pure Component Liquid
Fugacity Model
The Chao-Seader model calculates pure component fugacity coefficient, for
liquids. It is used in the CHAO-SEA property method. This is an empirical
model with the Curl-Pitzer form. The general form of the model is:
Where:
188 2 Thermodynamic Property Models
=
Parameter
Name/Element
Symbol Default MDS Lower Limit Upper
Limit
Units
TC T ci — — 5.0 2000.0 TEMPERATURE
PC p ci — — 10 5
OMEGA � i
References
10 8
— — -0.5 2.0 —
PRESSURE
K.C. Chao and J.D. Seader, "A General Correlation of Vapor-Liquid Equilibria
in Hydrocarbon Mixtures," AIChE J., Vol. 7, (1961), p. 598.
Grayson-Streed Pure Component Liquid
Fugacity Model
The Grayson-Streed model calculates pure component fugacity coefficients for
liquids, and is used in the GRAYSON/GRAYSON2 property methods. It is an
empirical model with the Curl-Pitzer form. The general form of the model is:
Where:
Parameter
Name/Element
Symbol Default MDS Lower Limit Upper
Limit
Units
TC T ci — — 5.0 2000.0 TEMPERATURE