Aspen Physical Property System - Physical Property Models

Where the ideal-gas contribution � o and residual contribution � r at a given
mixture density, temperature, and molar composition are:
Where the reduced mixture density � and inverse reduced mixture
temperature � are:
In eq. (2), the ideal-gas contribution of the reduced Helmholtz free energy for
component i is given by:
In eq. (3), the pure substance contribution to the residual part of the reduced
Helmholtz free energy for component i is given by:
In eq. (3), the mixture contribution to the residual part of the reduced
Helmholtz free energy is given by:
The reduced mixture density is given by:
And the reduced mixture temperature is given by:
2 Thermodynamic Property Models 21
(1)
(2)
(3)
(4)
(6)
(5)
(8)
(7)