Urea Final Separator Simulation (help)

[Reda Galih]

Dear all,

I was trying to make simulation of Urea Final Vacuum Consentrator (FA-203) in our plant but I didn't get the good result. Is it because of properties of urea in DWSIM or something else?

I also attached my simulation

Thank you

(I post it in help classic UI too because no answer here)

[Reda Galih]

attachements

[Gregor Reichert]

Hi,
first of all, you should use only a single flash algorithm -> Nested Loop (SVLLE)
The same is for property package -> initially try Raoults Law (ideal, without interaction parameters).
Now you should check solubility data of urea in water first!

If you got that right, you may proceed to evaporation of that solution

regards, Gregor

[Gregor Reichert]

Hi,
i modified the existing urea component to give realistic results for liquid density of solutions and a deminishing vapour pressure as a solute in water.

But when you calculate solubility, the results are not even half of literature data. Therefore boiling points are not correct as well.

@Daniel:
I think we will need some kind of regression of interaction coefficients for NRTL/UNIQUAC models from solubility data.

[Daniel Medeiros]

Gregor, if I'm not mistaken the regression tool supports SLE.

[Reda Galih]

It works, so closed with the design!

I used the Urea_modified.json from Gregor

Thank you Gregor and Daniel