Calculate product compositions, stage temperatures, interstage vapor and liquid flow rates and compositions, reboiler duty, and condenser duty for the following column specifications. Feed (bubble-point liquid at 250 psia and 213.9F):

Column pressure = 250 psia; partial condenser and partial reboiler; Distillate rate = 23.0 lbmol/h; reflux rate = 150.0 lbmol/hr; Number of equilibrium stages (exclusive of condenser and reboiler) = 15;
Feed is sent to middle stage. For this system at 250 psia, K-values and enthalpies may be computed by the Soave–Redlich–Kwong equations.

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Component Ethane Propane n-Butane n-Pentane n-Hexane lbmol/h 3.0 20.0 37.0 35.0 5.0