3 replies to this topic

[Hiren Parmar]

We have a process condensate stripper operating at 31-32 barg pressure. Process condensate contains Methanol 890ppm, Ammonia 530ppm, CO2 1500ppm , Amines 200ppm. Total condensate flow is 42000 kg/hr. Condensate temp. is 215deg C. Steam used at 31bar g , 344 deg C condition and flow 16.5 MT/hr . Stripped Condensate analysis shows Methanol 9ppm, Ammonia 5ppm , CO2 NT, Amines 21ppm.Now I tried to simulate this tray tower of 20 nos of Valve trays in Aspen as well as Chemcad but I couldn't get desired result . Can anybody help me how can I simulate this column? Which property method will be useful?

[Satyajit]

Hi Hiren,

PC stripper works quite well in aspen plus. Use PSRK property method.

Kind regards,

Satyajit

[J_Leo]

Hi Hiren, 

 

(1) ppm in wt or mol?

(2) what kind of amine?

(3) MT/hr = metric ton / hr?

[Hiren Parmar]

@Satyjit Thanks for reply . I had tried using PSRK method as well but it's not effective for NH3,Amines and CO2 removal. NH3 remains in stripped condensate ,hardly any NH3 is stripped out. . In fact Chemcad suggested PSRK model for my system but it doesnot strip out the Ammonia . I think the problem lies due to combine of Methanol and Amine system hence any specific model for methanol or amine system doesnot work here. 

 

@J_Leo Thanks.  It's a CO2 removal process using activated 40% wt/wt MDEA solution . PPM is mass and yes Metric ton per hour.