You may supply petroleum components directly with this window. The tabular input may be used to supply as many components as desired in a single visit to the menu. All necessary physical and thermodynamic properties for petroleum components are computed from three correlating parameters: normal boiling point, standard liquid density and molecular weight. You must supply at least two of these properties for each petroleum component; PRO/II uses internal correlations to determine the third parameter, when missing. The property estimation methods are designed for use with hydrocarbon components such as those found in petroleum fluids.
Note: Properties of light end components depart significantly from the values predicted by PETRO component characterization. For this reason, it is strongly recommended that petroleum components should have a carbon number of 6 or more. To model species with lower carbon numbers, use fully defined components, such as those found in the component data libraries.
Usage
From the Component Selection Main Window, push the Petroleum button.
Supply as many petroleum components as desired, using the tabular input. See Editing Tabular Data for further information on tabular data entry.
Additional Information
At least two of the three correlating properties, normal boiling point, standard liquid density and molecular weight must be supplied for each petroleum component. PRO/II uses internal correlations to determine the third property, if missing.
Petroleum component names are optional. If you do not supply a name for a petroleum component, PRO/II generates a name of the form "NBP XXX", where "XXX" is the normal boiling point for the component.
Normal boiling points and/ or standard liquid densities may be provided in dimensional units different from those shown by selecting the data field and using the Unit-of-Measure Selection Window which is displayed when the UOM button on the Toolbar is pushed.
Molecular weight is the most difficult property to predict accurately, especially for cracked stocks such as FCC and coker cycle oils, FCC slurry, etc. Therefore, this property should always be supplied when possible for the most accurate characterization of a petroleum component.
All the derived values appear in green color, as default values. If the user fully changes any value, the changed value is saved in the database and is never calculated in the future.
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