A feed to a column has the composition given in the table below and is at a pressure of 14 bar and a temperature of 60 °C. Calculate the flow and composition of the liquid and vapour phases. Take the equilibrium data from the Depriester charts given in Chapter 8.

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Feed ethane (C) propane (C3) isobutane (iC4) n-pentane (nC5) kmol/h 20 20 20 20 Zi 0.25 0.25 0.25 0.25