Required hand calculation:

EXAMPLE 2-3. Simultaneous solution for flash distillation We have a liquid feed that is 20 mol% methane, 45 mol% n-pentane, and 35 mol% n-hexane. Feed rate is 1500 kmol/h, feed temperature is 45C, and pres- sure is 100.0 psia. The flash drum operates at 30 psia and is adiabatic. Find: T. V/F, x;, y;, L, V. drum Solution A. Define. The process is sketched in the diagram. V, Yi unknown 1500 kmol/h p = 30 psia Tdrum = ? 4-0.20 2p=0.45 24.35 TE=42C L,X; unknown B. Explore. Since To is given, this will be a double trial and error. K values from the DePriester charts or from Eq. (2-30) can be used. For energy balances, enthalpies can be calculated from heat capacities and latent heats. The required data are listed in Table 2-5. C. Plan. Since this is a double trial and error, all calculations will be done on the computer and summarized here. Newtonian convergence will be used for both the Rachford-Rice equation and the energy balance estimate of new