NRTL Parameters

[floatingpointerror]

Hey guys.


I am trying to understand the code my 'predecessor' has left behind.

The code is in C-format, and basically attempts to do VLE calculations, and LLE using the NRTL Thermodynamic method.

Can anybody tell me what the NRTL parameters Gamma, Phi, Alpha, A, B, and C stand for? What is their physical significance?

Any insights onto the matter would be much appreciated!

 

[PaoloPemi]

I would suggest a book as phase equilibria in chemical engineering or equivalent, NRTL (Non Random Two Liquid) equation can represent vapor liquid or liquid liquid equilibria, I know three fitting parameters (A12, G12, G21), possibly your Phi means fugacity but you should compare your code with the NRTL formulation.

 

[siretb]

Be extremely careful. The A parameters can vary by a factor 1.98 depending on the way it is coded (units)
The ASPEN manual ,available inmine, explains the parameters.