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Download August 11, 2009

Focus on the HYSYS Reboiler

In this article we focus on a feature relaased in HYSYS v7 which will be of interest to many HYSYS users - support for various reboiler configurations in the column, available from the Input Expert.

The HYSYS release notes outline features and enhancements in a number of different areas, summarized at the end of this article.


Reboiler Configurations

When a reboiled absorber or distillation column are added using the Input Expert, a new page is available which provides some options for setting up the reboiler in HYSYS:



If the default selection is used – “Once-through” and “Regular Hysys reboiler”, then the reboiler will be set up exactly as it has been done previously. The column subflowsheet appears as follows:




Users now have the ability to select a different reboiler type or a different circulation option:

Reboiler Configuration


Reboiler Type

  • Regular HYSYS reboiler – Applicable to the once-through option – heating and separation are accomplished in the reboiler.
  • Heater – The reboiler is modeled using a heater followed by a separator which withdraws the liquid product and routes vapour to the column.
  • Heat Exchanger – The reboiler is modeled using a heat exchanger followed by a separator which withdraws the liquid product and routes vapour to the column.


The addition of this new functionality to HYSYS should be useful for many engineers. We do have some cautions, however:

  • We have learned from experience that subflowsheets for Amine columns should in general not be manipulated; adding additional equipment to the subflowsheet for amine contactors and regenerators may give incorrect results.
  • Adding more equipment to the column subflowsheet can make the column more difficult to solve. In some cases it may be preferable to model equipment outside of the column subflowsheet (for example, when modeling a heat exchanger instead of the standard reboiler)


If you have any comments on this functionality which you would like to share with us or other HYSYS users, please e-mail us.


List of new features

The new features in HYSYS v7.0 as per the Aspentech release notes are as follows:

“Aspen HYSYS V7.0 includes the following new features and enhancements in the following areas:

  • Enabling Aspen Properties compounds and property methods for simulations
  • APV70 and NISTV70 compound databases
  • New thermodynamic property models
  • Electrolyte capabilities
  • Process Economic Evaluation
  • Hydrates Utility
  • Process Utilities
  • Improved Input Summary
  • Unit Operation Enhancements
  • Aspen Custom Models (ACM) enhancements HYSYS
  • Additional CapeOpen 1.1 Support
  • PID support vendor specific control algorithms
  • Calculated residence time for every tray of the tray section
  • Level Tap option now available for the Sump Bottom tray of columns
  • Rigorous heat exchanger modeling speed improvements


Do you have questions or comments regarding this article? Click here to contact us.

By James Holoboff, M.Sc., P. Eng.

James has over 25 years of experience in process engineering and emissions management for the chemical and petroleum industries. He brings a strong background in the development and application of computer simulation models to Oil & Gas industry challenges. James worked for Hyprotech/Aspentech for almost 10 years in various capacities including Global Technical Support Manager and Business Development Manager for the Project Services Division. He then spent 5 years providing process engineering and simulation consulting to a number of operating companies and engineering firms. James has been a Managing Partner for Process Ecology for 10+ years, during this time providing process engineering services, emissions reporting, project management, and software development support. James is a Chemical Engineering graduate from the University of Calgary and holds an MSc in Chemical Engineering from the same institution. In his spare time, when he’s not playing ice hockey or cycling, he is recovering from injuries incurred from those sports.

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