Questions regarding the binary interaction parameter
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Dear senior teachers, I am a beginner in ASPENPLUS and would like to ask a question. For example, when calculating the liquid-vapor equilibrium relationship for methanol and water vapor, if the NRTL-RK property method is selected, why are only the binary interaction parameters for the liquid phase displayed, and not those for the gas phase mixture?
When using ASPEN PLUS for simulation, if NRTL-RK is selected as the property method, it focuses primarily on the non-ideal behavior of the liquid phase. The NRTL model is used to describe the interactions between components in liquid mixtures, while the RK (Redlich-Kwong) equation is employed to describe the equation of state for gaseous phases. In this case, the gas phase is typically assumed to be an ideal gas; therefore, no additional binary interaction parameters are needed to describe the interactions between components in the gas phase. So you only see the interaction parameters for the liquid phase; since the gas phase is assumed to be ideal, no interaction parameters are shown for it. .
Using NRTL is sufficient; there is no need to use NRTL-RK