Aspen Physical Property System - Physical Property Models

Liquid Volume Quadratic Mixing Rule
With i and j being components, the liquid volume quadratic mixing rule is:
Option Codes
Option Code Value Descriptions
1 0 Use normal pure component liquid volume model for all
components (default)
1 Use steam tables for water
2 0 Use mole basis composition (default)
Parameter
Parameter
Name/Element
1 Use mass basis composition
2 Thermodynamic Property Models 213
Symbol Default MDS Lower
Limit
Upper
Limit
VLQKIJ K ij - x - - —
Units
This model is not part of any property method. To use it, you will need to
define a property method on the Properties | Property Methods form.
Specify the route VLMXQUAD for VLMX on the Routes sheet of this form, or
the model VL2QUAD for VLMX on the Models sheet.
Heat Capacity Models
The Aspen Physical Property System has five built-in heat capacity models.
This section describes the heat capacity models available.
Model Type
Aqueous Infinite Dilution Heat Capacity
Polynomial
Criss-Cobble Aqueous Infinite Dilution
Ionic Heat Capacity
General Pure Component Liquid Heat
Capacity
General Pure Component Ideal Gas Heat
Capacity
General Pure Component Solid Heat
Capacity
Electrolyte liquid
Electrolyte liquid
Liquid
Ideal gas
Solid
Aqueous Infinite Dilution Heat Capacity
The aqueous phase infinite dilution enthalpies, entropies, and Gibbs energies
are calculated from the heat capacity polynomial. The values are used in the
calculation of aqueous and mixed solvent properties of electrolyte solutions: