Pseudocomponents(ASPEN Plus)

About Pseudocomponents(ASPEN Plus)

1. Pseudocomponents(ASSAY)

Pseudocomponents represent fractions of a petroleum mixture within specified ranges of true boiling point (TBP). You can enter cut point temperatures to specify these ranges, or use the default cut points. ADA/PCS cuts the TBP distillation curve at these temperatures to determine the proportions of the pseudocomponents. Material which boils at temperatures above the highest cut point is included in the highest-temperature pseudocomponent. Material which boils at temperatures below the lowest cut point is included in the lowest temperature cut point, except for specific components specified as light ends. (See About Light Ends.) Pseudocomponents are not created for cutpoint temperatures outside the range of the distillation curve data unless All is selected for the Pseudocomponent generation option on the Components | Petro Characterization | Generation | Cuts sheet.

ADA/PCS determines the normal boiling point of each pseudocomponent by integrating the distillation curve to produce a volume-fraction or weight-fraction average boilingpoint (depending on the basis of the entered distillation curve).

 

2. Pseudocomponents(User-defined)

You can also create user-defined pseudocomponents on the Components | Specifications | Selection sheet. Rather than being generated from assay data, thesepseudocomponents are characterized by the data you enter on the Components | Pseudocomponents form.

You must enter two of the following types of data for each user-defined pseudocomponent:

• Molecular weight

• Normal boiling temperature

• Specific gravity or API gravity