Electrolyte Models
The built-in electrolyte models in PRO/II simulate aqueous systems in a wide range of industrial applications. The models apply to fixed component lists with a pre-defined set of thermodynamic methods for K-values, enthalpies and densities. It is not possible to define individual methods for K-value, enthalpy or density.
To use the electrolyte models, you must select Electrolyte in the Thermodynamics Main Window.
Application Range
The suggested range of applicability for the electrolyte models is summarized below:
Temperature: 32-390 F (0-200 C)
Pressure: 0-200 atm
Dissolved gases: 0-30 mole %
Ionic solutes: 0-30 ionic strength
Amine Systems
Pressure: 0-30 atm
LLE Systems
Organic solutes: 0-10 weight %
The following electrolyte models are available:
Calculations and Units
Electrolyte models may not be be used to calculate:
- non-aqueous electrolyte systems
- free water decant
- water dew points
- hydrocarbon dew points
- entropy and heat capacity
The following unit operations are available with Electrolyte Models.
Flash Pump
Valve Mixer
Splitter Pipe
Simple heat exchanger LNG heat exchanger
Conversion reactor Equilibrium reactor
Stream calculator Heating/Cooling curves
Calculator Controllers
Optimizer
Mixed Thermodynamic Applications
The PRO/II electrolytes use a different enthalpy basis from that used for other thermodynamic systems. When both are used, PRO/II automatically takes care of the difference but it may appear to be confusing. To avoid this, select the Electrolyte enthalpy method for all non-electrolyte thermodynamic systems in a mixed application. All systems will then use the electrolyte basis.
User-added Models
If there is no pre-defined model which is suitable for your application, you may add your own models to PRO/II. If you wish to do this, contact your nearest SimSci support office.
Databank Search Order
When using Electrolyte thermodynamics, the OLILIB component databank should be searched first and the SIMSCI databank second. See Component Databank Search Order for more details.
Additional Information
Descriptions of the individual thermodynamic methods may be accessed from the Thermodynamic System - Modification Window by selecting the type of property, i.e., K-value, liquid enthalpy, etc., the method, and pushing the Help button. More detailed information can be found in the sections "Electrolyte Mathematical Model" and "Electrolyte Thermodynamic Equations" in Chapter 2, Volume 1 of the PRO/II Reference Manual .
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