NRTL recommended model parameters

For several binary systems recommended model parameters for the -models Wilson, NRTL, and UNIQUAC are given in Tables 5.9-5.11. Typical results for the system acetone-water using the NRTL model are shown in Figure 5.34. It can be... 

For the second case, Equation 9 was used with Equations 3 and 4 to reduce the same binary Ga-Sb data sets. The stoichiometric liquid mixture activity product was fixed at the melting temperature by the NRTL model parameters. The remaining thermodynamic properties found in Equation 9 were assigned the values recommended by Chang et al. (4.). 

To get an idea about the relative volatilities of components we proceed with a simple flash of the outlet reactor mixture at 33 °C and 9 bar. The selection of the thermodynamic method is important since the mixture contains both supercritical and condensable components, some highly polar. From the gas-separation viewpoint an equation of state with capabilities for polar species should be the first choice, as SR-Polar in Aspen Plus [16]. From the liquid-separation viewpoint liquid-activity models are recommended, such as Wilson, NRTL or Uniquac, with the Hayden O Connell option for handling the vapor-phase dimerization of the acetic acid [3]. Note that SR-Polar makes use of interaction parameters for C2H4, C2H6 and C02, but neglects the others, while the liquid-activity models account only for the interactions among vinyl acetate, acetic acid and water. To overcome this problem a mixed manner is selected, in which the condensable components are treated by a liquid-activity model and the gaseous species by the Henry law. 

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