×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

Property package for NH3, CO2 in water

Property package for NH3, CO2 in water

Property package for NH3, CO2 in water

(OP)
Can any one suggest which property package is good for simulation (HYSYS/ProII/VMGSIM) of NH3 & CO2 dissolved in water. I need to do a simulation of a distillation column which separates NH3/CO2 from water. I think Peng Robinson or SRK are not good for this mixture.
thanks
Rajesh

RE: Property package for NH3, CO2 in water

you can get fairly close by doing the following:

assume that all the CO2 will react with NH3 to form carbamate (pre-cursor to urea).  so every molecule of CO2 will associate with 2 molecules of NH3.

then assume the excess NH3 will behave like a typical NH4OH ammonia/water compound.

you can get pretty close to estimating vapor pressure of the ammonia/water by doing this.

RE: Property package for NH3, CO2 in water

If the OP is trying to separate or recover the ammonia by distillation or other means he will have to prevent the formation of the Carbonate by adding enough NaOH to tie up the CO2 or he will have a system plugged with the Carbamate.  

RE: Property package for NH3, CO2 in water

you might also want to contact Engineering firms that do Urea plants.  

Many Urea plant process designs use a steam stripper (either live steam or via reboiler) to take water that is ~10% ammonia and 5% urea and get it down to ~10 PPM NH3 and ~10 PPM urea.

This stream typically contains a fair amount of CO2 as well and the relatively high bottom temperatures (~75 psig on the system and so >325°F) causes decomposition of the Urea to CO2 & NH3.

for this type of system, no NaOH was needed.

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!


Resources