where NC is the number of components, a- is the relative volatility of component j, and q is the thermal condition of the feed (q = 1 for saturated liquid feed, q = 0 for saturated vapor feed).

Applying this to the binary propane/isobutane system for saturated liquid feed with composition 40 mol% propane and using the average relative volatility of 1.8076 for propane and 1 for isobutane give ajZj (1.8076X0.40) (1X0.60) 1 1

This value of 0 is substituted into the second Underwood equation, using the the distillate composition xD = 0.98 mf propane:

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