Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Ethylene Oxide Separation Column In Chemcad

Ethylene Oxide Separation Column In Chemcad

Ethylene Oxide Separation Column In Chemcad


Respected forum Members,
I am trying to simulate a separation column in ChemCad,
I have taken the exact specs given in the literature and used in the ChemCad simulations. But the simulation does not provide any results in the outlet stream (all zeros) or any warning.
ChemCad file attached, https://filebin.net/g08tsn89d87vjtco
Any input is appreciated. 

Column Specs
Property Package Ideal (Raults law)

RE: Ethylene Oxide Separation Column In Chemcad

Thank you so much for taking the time and doing the simulation. would it be possible for you to share the simulation file with me? If not possible can you please tell me how much EO was removed from the outlet Gas streams? I can share CHemCAD which is installed in the virtual machine. Thank you again.

RE: Ethylene Oxide Separation Column In Chemcad

Thank you for your comments.

Yes, I agree that EO is very soluble in water. I also tried with NRTL but failed to converge this specific column in Aspen Plus and ChemCad. I realized that this unit operation predominately separates gases (methane, ethylene (unreacted), Carbon dioxide) and liquids (water and Ethylene Oxide) so currently using UNIFAC. My initial assumption was it would be easier to converge this unit operation with most of the property packages. But I was wrong.

In the downstream column that actually separates water and Ethylene Oxide, we have used experimental regression data.

RE: Ethylene Oxide Separation Column In Chemcad

Unfortunately, I have Pro II version 9.1 will try to simulate it. Thank you.

RE: Ethylene Oxide Separation Column In Chemcad

If you want to proceed to really build the scrubber on the basis of simulation, the appropriate thermodynamic model should be elecNRTL (you can change the vapor phase to RK model). You are not supposed to use UNIFAC model (it is my recommendation). you can estimate missing interaction parameters using UNIFAC model using NRTL (the best approach is ofcourse VLE experimental data regression....). Further, for such scrubbers rather than using equilibrium model, in my experience, rate-based model would be more efficient. Also, make sure your Henry's components are selected appropriately to predict the solubility of gas correctly.

RE: Ethylene Oxide Separation Column In Chemcad

Thank you again. Can you please direct me to any documentation? where we have used different property models for different phases.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close