×
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

VDU ejector off gas

VDU ejector off gas

VDU ejector off gas

(OP)

Off gas from the refinery vacuum distillation unit is routed to fired heater. Off gas is rich in H2S and results with increased SO2 emmision from VDU heater. What are the cost effective solution available to remove H2S from this stream?

Regards,

RE: VDU ejector off gas

depends on strean size and H2S concentration.  Plus stream conditions of temp, press, and other constituants.

RE: VDU ejector off gas

(OP)
Thank you for your replay dcasto. Stream description is:
Pressure:0.05bara
Temperature:50degC
Quantity:1000kg/hr
Composition:
H2S 30 mol%
O2 0.1mol%
N2 1.7mol%
CO 4.4mol%
CO2 0.4mol%
H2 2.4mol%

Rest is light hydrocarbons. Suppose it is necessary to increase stream pressure and send it amine unit, which technologies are available?

Regards,

RE: VDU ejector off gas

looking at the composition, by brain says, the least amount of handling is what will set the technology.  The fewest steps and processes the better.

With that, you will need to compress, if you turely have .05 bar absolute, even .05 bar gauge is tough enough.

Physical solvents require the most pressure, so they would be my last choice.

If you can have brown sulphur, I'd look at direct conversion of the stream in a iron chelate process lo-cat is typical.  

If sulphur specs are tight, then a primary amine would be used.

Shell has a biological based system you could look into.
 

RE: VDU ejector off gas

Milutin, some companies put it to a flare header. The Flare Gas Recovery system is then used to send it to an amine unit. Several risk though (like air into your flare system).  

RE: VDU ejector off gas

If you have a primary amine, the O2 will react and make a salt and you'll have to reclaim the amine much harder.

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