Using the Antoine equation, we can calculate the bubble point temperature of the feed for propane and n-butane. Where Psat is the vapor pressure of the component, T is the temperature in Kelvin, and A, B, and C are constants specific to each component. The relative volatility can be calculated using the Antoine equation: To find Nmin from the Fenske equation, we need to calculate the relative volatility between the key components (propane and n-butane) at the bubble point temperature of the feed.
