explain each step in detail please.

Question 4: The product from the stripping section of a natural gas absorption plant has the following composition: Component Mole fraction CH 0.13 CzHs 0.06 CHE 0.16 nC H30 0.28 nCH2 0.37 It is fed to a distillation column where it is separated into two fractions, one of which contains Imol% butane and the other Imol% propane. Reflux is provided for the distillation column by a partial condenser system from which the overhead product passes directly to the gas main. With the plant operating under steady state conditions at a pressure of 28bar, it is observed that the temperature in the reflux accumulator is 30C and the top tower temperature is 45C. Show that: a) An equilibrium condensation is taking place in the partial condenser b) The quantity of reflux returned per mole of overhead product is approximately 1. It may be assumed that the top plate of the tower behaves as a perfect stage. The nomograph of equilibrium constants is provided