×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

presence of nitrogen in permeate side

presence of nitrogen in permeate side

presence of nitrogen in permeate side

(OP)
I work in a lab where I am developing membrane based CO2 separation processes.
The feed to the membrane is 90%CH4-10%CO2 gas mixture pressurized at 10 atm. The membrane selectively permeates CO2 and some CH4. The permeate side is at atm. pressure and its composition is analyzed using GC by manual injections. However, when I inject permeate sample in the GC I am getting nitrogen peak as well in addition to CO2 and CH4 peaks. I am not sure what could the possible source for this nitrogen as it is not giving the correct permeate side compositions.
I have tried purging permeate and feed side with helium gas and feed gas repectively before introducing it to membrane before starting each experiments but that did not change the result.
The flow at permeate side is measured using bubble flow meter.
Any ideas why I am getting nitrogen peak in my system and how to get rid of that.
Thanks,

RE: presence of nitrogen in permeate side

Does your GC use nitrogen as the carrier gas??

RE: presence of nitrogen in permeate side

(OP)
The carrier gas in GC is helium.

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


Resources

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