1 reply to this topic

[Majid Meraj]

Hi folks,

hope everyone is doing well, i am trying to simulate a separator. the feed to the separtor contains CO2,Ammonia,water and Carbamate.

the temperature and pressure condition are very high i.e 204'C and 150kg/cm2. feed is at 156kg thus a reduction of 6Kg pressure.

Is it actually possible to simulate it? if yes then which property package should i use? i would also request to guide me briefly about how to simulate this particular separator? 

[Saml]

Seems you are trying to simulate the high pressure section of a urea plant.

 

Aspen Tech has an example model that can be downloaded from it's support site. It is an example, and not a guaranteed product. They state "consulting may be needed for technology transfer and further model development and validation"

 

Search there for "urea". In my case was the first result. I've tried it, and it does not replicate what we see in the plant. You cannot modify it since is a compiled dll. So try it  and see if it fits your required use. 

 

Most of the publicly available simulations of this system are based on uniquac (available in Aspen, but you need to check all the parameters) or extended uniquac (not available in Aspen).

 

If you have not done it yet, I would strongly recommend that you study the system first before embarking in simulation. It is a system of only 3 components but is complex (3 salts plus double salts - cuadruple points - supercritical components - ionic species - maximum temperature azeotrope - VLS equilibrium at low temperature).

 

All of this makes it very difficult to trust your intuition when you are simulating.

 

One of the best works I've found on this system is a Thesis dissertation by Krishnan RAMASAMY. 

http://repository.tu...iss 1616(1).pdf

 

Hope this helps