Figure 7 . Results for the CHEMCAD, Aspen HYSYS, and DWSIM simulation models. All three agree within reasonable accuracy.
Figure 8 compares the results for each column with the ideal stage model. For the TPR column, both the argon and nitrogen values match the model at around 4.5 stages. For the PTL column the argon and nitrogen values match the model at around 5 and 7 stages, respectively, while for the AMPH column both argon and nitrogen match at around 8 stages.