Currently, actions on components that appear in the List of Selected
Components in the Component Selection main window are limited to deletion or renaming of components.
To delete a component:
Highlight the name of component in the List of Selected Components.
Click Delete.
To rename a component for printout purposes:
Highlight the component.
Click Rename… to open the Rename a Component window.
Enter the new name in the data entry field.
Modifying Component Properties
You can modify properties for any component entered through the Component Selection main data entry window via the Component Property window. To reach this window:
Select Input/Component Properties... from the menu bar or click on the main toolbar.
The Component Properties window is the master navigation point for changing all component properties. Component properties taken from password protected libraries are shown with text “PROT” in GUI and users are not allowed to modify this data.
Note: Component properties cannot be defined before the component names have been entered.
There are three methods available for component property modification:
Method 1: Specifying Fixed Properties
Click Fixed… to open the Components Properties-Fixed Properties window.
Here, you can modify fixed component properties such as molecular weight, critical temperature and NBP. With the exception of assay components, all components can be modified via this window. For those properties having UOM's, all data is displayed with the UOM’s of the current problem.
Starting from this window, use the appropriate button to modify other properties:
Click Critical Properties… to specify critical temperature, critical pressure, critical volume and critical compressibility factor.
Click Molecular Constants… to specify properties such as Dipole
Moment, Radius of Gyration, van der Waals Area parameter and van der Waals Volume parameter.
Click Heats of Formation… to specify Enthalpy of Formation and Gibbs Energy of Formation. In this entry, reference phase designation is a required input. The reference phase can be vapor, liquid or solid. Vapor phase is the default.
Click Miscellaneous Properties to specify Acentric Factor, Solubility Parameter, Rackett Parameter, Liquid Molar Volume, Heat of Vaporization, Heat of Fusion, Normal Melting Point, Triple Point
Temperature, Triple Point Pressure, Heat of Combustion, Gross Heating
100 PRO/II User Guide April 2014
Value, Lower Heating Value, Carbon Number and Hydrogen Deficiency Number.
For PRO/II library components, the values in the database will appear in the various property windows. In cases where there is no library value to serve as the default, the default displayed will be the text “Missing.” You may reassign values for any of these properties.
Method 2: Specifying Temperature-dependent Properties
You may enter or override default data for properties that change with
temperature, such as density and viscosity, for the vapor, liquid or solid phases of the pure components in your simulation. You may supply new data in the form of tables or as correlation coefficients of one of 29 different equation types.
Click Temperature Dependent to open the Component Properties –Temperature Dependent Properties window. All the library and user-defined components from the current problem are displayed. To enter or modify data for a property of a component, click on the corresponding push button for that component. For properties that may apply to more than one phase, you will first be required to select the phase for which you are to supply data in the Component Properties – Phase window,
Click VP to enter or modify liquid or solid vapor pressure data
Click H to enter or modify vapor, liquid or solid enthalpy data
Click Cp to enter or modify solid heat capacity data
Click ∆Ην to enter or modify latent heat data
Click ρ to enter or modify liquid or solid density data
Click µ to enter or modify vapor or liquid viscosity data
Click κ to enter or modify vapor, liquid or solid conductivity data
Click σ to enter or modify liquid surface tension data
In the Component Properties - Data Source Selection window, choose the method of data entry. You may enter data either in tabular form or as coefficients for one of as many as 29 equations.
If you choose the Correlation Coefficients option, you may display the form of the equation by selecting the appropriate Correlation Number in the like-named drop-down list.
Select one of the correlations and supply coefficients as required. If the form of the equation is logarithmic, you may select the base of the logarithm. You may change the units of the equation and may impose maximum and minimum temperatures of applicability.
Note: The full range of equations can be found in the online PRO/II Reference Manual accessible via the Help system. If you choose an equation that is not standard, a message to that effect appears, and the border of the drop-down list box will be yellow.
If you choose the Tabular Data option, the Component Properties –Tabular Data window appears.
Enter temperature and property data. You must enter at least one data pair.