Aspen Physical Property System - Physical Property Models

The binary parameters �ca,B , �ca,B and �B,ca are now the adjustable parameters
for an apparent binary system of a single electrolyte and a single solvent.
The excess Gibbs energy expression (equation 24) must now be normalized
to the infinite dilution reference state for ions:
This leads to:
By taking the appropriate derivatives of equation 33, expressions for the
activity coefficients of all three species can be determined.
Multicomponent Systems
The Electrolyte NRTL model can be extended to handle multicomponent
systems.
The excess Gibbs energy expression is:
104 2 Thermodynamic Property Models
(32)
(33)
(34)
(35)
(36)