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[Nomad_913]

Hello.

 

While I simulated a process in Unisim, I got to have a question.

In overall equipment except distillation column, they were set as Peng-Robinson equation.

On the other hand, I set NRTL in column due to the better separation between materials.

 

I set the column fluid pkg in 'Basis Environment' as setting the column subflowsheet to NRTL.

However, when I checked the bottom stream, it seemd to be calculated with PR EoS.

(The temperature was different between in column environment and the results main flowsheet)

 

I don't understand it intuitively. Doesn't the bottom results automatically show the output calculated with NRTL?

 

Would you explain this principle? I couldn't find about it in Unisim User guide.

 

Thanks a lot!!