1 reply to this topic

Hi all, I am Eng.Antonio Aulicino (University Federico II of Naples, Italy).
My target is to design an absorber column for toluene not with pure water, but with a solution of water and copolymer that enhanced the solubility of toluene in water.
So I created a pseudo-toluene.
For the pseudo-Toluene I inserted the true data except the data of water solubility because I inserted the solubility of Toluene in the solution water-copolymer. The problem is that Aspen seems not to use the data I inserted, in fact the ammount of toluene dissolved in water is not the value that I inserted. To check the ammount of toluene dissolved in water i used a FLASH that can achieve the thermodynamic equilibrium, but, as I said, the final value of the amount of toluene dissolved in the water isn't the value that I have setted. I have the impression that Aspen doesn't use my data, why? I would like to insert the Henry's constant (but I don't know how), so I can give the Henry's constant corresponding to the solubility of toluene in the solution of water and copolymer. Thanks all

[chenblue]

Getting physical properties of a mixture is very difficult, so the general way to do this is using standard test method of measuring distilling curve, like ASTM-D86 or TBP, etc. These methods are generally using for petrochemicals. Anyway, measuring is the best way if you have those instruments.