prop-005h hypothetical components

Prop-005H Revised: Nov 7, 2012

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Hypothetical Components and Petroleum Assays with Aspen HYSYS V8.0

1. Lesson Objectives Create hypothetical components in Aspen HYSYS

Characterize a petroleum assay

2. Prerequisites Aspen HYSYS V8.0

3. Background Aspen HYSYS allows you to create non-library or Hypothetical components. These hypothetical components can

be pure components, defined mixtures, undefined mixtures, or solids. A wide selection of estimation methods

are provided for various Hypo groups to ensure the best representation of behavior for the Hypothetical

component in the simulation.

In order to accurately model a process containing a crude oil, such as a refinery operation, the oil properties

must be defined. It is nearly impossible to determine the exact composition of an oil assay, as there are far too

many components in the mixture. This is a situation where hypothetical components are useful. Boiling point

measurements of distillate fractions of an assay can be used to characterize the oil properties.

The examples presented are solely intended to illustrate specific concepts and principles. They may not

reflect an industrial application or real situation.

4. Problem Statement and Aspen HYSYS Solution

Problem Statement

Create a hypothetical component group in Aspen HYSYS and characterize a petroleum assay to be used in a

refinery simulation.

Aspen HYSYS Solution

4.01. Start a new simulation in Aspen HYSYS V8.0.

4.02. Create a component list. In the Component Lists folder select Add. Change the Select field to

Hypothetical and enter the Initial and Final Boiling Points for the hypothetical group shown below.

Click Generate Hypos when complete. This will generate a group of hypothetical components with

estimated properties based on the specified boiling point of each cut.


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4.03. Click Add All to add the entire hypothetical group to the component list.


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4.04. Define property package. In the Fluid Packages folder select Add. Select Peng-Robinson as the

property package.

4.05. Enter the simulation environment by clicking the Simulation button in the bottom left of the screen.


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4.06. Add a Material Stream to the flowsheet from the Model Palette. Double click the stream and go to the

Composition form under the Worksheet tab.

4.07. You will notice that the mole fractions of all the components are empty. If you would like to assign an

oil assay to this stream go to the Petroleum Assay form under the Worksheet tab. Select the option

Create New Assay On Stream.


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4.08. Click the Petroleum Assay Specifications button. This page allows you to enter assay distillation data or

import data from a known oil assay.


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4.09. Click the Import From button and select Assay Library to import data from a known assay in the HYSYS

assay library.

4.10. Say, for example, that we want to model a refinery process using Bachaquero heavy crude from

Venezuela. Scroll down the list of assays and select Bachaquero, Venezuela. Click Import Selected

Assay.


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4.11. After a few moments the MacroCut Data window will be filled with distillation cut data for Bachaquero

heavy crude.

4.12. Click the Calculate Assay button to assign mole fractions to the hypothetical components defined for

the stream. Exit the MacroCut Data window and view the Components form of the material stream.


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4.13. The composition for the stream is now defined and will model the properties of the selected petroleum

assay through the use of hypothetical components.

5. Conclusions This example demonstrates how to create hypothetical components and how to assign a petroleum assay to a

stream in order to model the assay properties in a simulation.

6. Copyright Copyright 2012 by Aspen Technology, Inc. (AspenTech). All rights reserved. This work may not be

reproduced or distributed in any form or by any means without the prior written consent of

AspenTech. ASPENTECH MAKES NO WARRANTY OR REPRESENTATION, EITHER EXPRESSED OR IMPLIED, WITH

RESPECT TO THIS WORK and assumes no liability for any errors or omissions. In no event will AspenTech be

liable to you for damages, including any loss of profits, lost savings, or other incidental or consequential

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prop-005h hypothetical components

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