Aspen Physical Property System - Physical Property Models

The contribution to the activity coefficient of component I from the
combinatorial term is thus:
Molecular components
It is easy to show that activity coefficients for molecular components from the
Flory-Huggins term are normalized; that is
where I applies to all molecular components in the solution.
Ionic components with symmetric reference state
Applying Eq. 10, the symmetric activity coefficients for ionic components from
the Flory-Huggins term can be carried out as follows:
with
where I applies to all molecular components in the solution.
128 2 Thermodynamic Property Models
(70)
(71)
(72)
(73)
(74)
(75)
(76)
(77)
Ionic components with infinite dilution aqueous solution
Applying Eq. 12, the unsymmetric activity coefficients for ionic components in
aqueous solutions can be carried out as follows:
(78)
(79)