by jasper » 14 June 2013, 15:09
This is not an easy system from a thermodynamic point of view. The CO2 that dissolves in the liquid is only part of the CO2 that will be adsorbed; the CO2 that reacts with the amines is what you are interested in. Also the reaction of H2O to form H2CO3 should probably be catered for, which depends on the pH and ionic strength.
To model such a system with any accuracy you need a specific property package that does reactions and electrolytes in the liquid phase. TEA will not do this for you.
Of course if you have measurements of the results within the operating region that you are interested in you can also approach the CO2 absorption as an interpolation problem. But this too requires some custom thermodynamics package.