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!
  • Students Click Here

*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


Lean Amine over stripping - when is it considered too much?

Lean Amine over stripping - when is it considered too much?

Lean Amine over stripping - when is it considered too much?

Dear all,

Can you please let me know if you have a minimum limit for H2S content on the lean amine stream?

During regeneration of amine, it is known that operators must ensure the lean loading is less than 0.1 mol/mol and in some case even lower (less than 0.05 to 0.07 mol/mol). Given such a fact and for units processing gas containing H2S and CO2, with a H2S / CO2 ratio less than 0.5, it is recommended to avoid over stripping of the amine to keep some H2S and ensure the formation of a protective FeS layer in the CS equipment.

In this case, what is the minimum amount of H2S in the lean amine stream necessary to ensure the formation of such protective FeS layer and thus minimize corrosion of the amine stripper itself (and remaining equipment in contact with high temperature lean amine)?

I would appreciate if you can share your thoughts on it.

Thank you and kind regards

RE: Lean Amine over stripping - when is it considered too much?

There are several other parameters to consider, not least the specific amine type. Take a look at European Federation Of Corrosion Publication 46 - Corrosion In Refinery Amine Units and see if there is any assistance there.

Baker Hughes had a presentation way back that advocated the following thresholds:

0.08 mol/mol in MEA
0.02 mol/mol in DEA
0.004 mol/mol in MDEA

Steve Jones
Corrosion Management Consultant


All answers are personal opinions only and are in no way connected with any employer.

RE: Lean Amine over stripping - when is it considered too much?

Thank you Steve. I'll also verify the document you are referring.

We have a few units running MEA, but most run MDEA and DGA. I've seen one reference stating that 300 ppm of H2S in the lean amine is the minimum recommended value for units processing acid gas with H2S/CO2 ratio below 0.5. Can you please share your thoughts on this limit?

If you allow me, I have one additional question: In Baker presentation the loading stated refers to H2S loading only? Or is it referring to the total loading (H2S + CO2)? For me this is an important detail, since we are processing gas from different sources and with different H2S/CO2 ratios, ranging from almost sweet to sour.

Again thank you for your prompt response.

Best regards,

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!


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