A hydrocarbon feed consisting of a mixture of 20 wt% propane, 30 wt% isobutene, 20 wt% isopentane, and 30 wt% n-pentane is fractionated at a rate of 1000 kmol/hr into a distillate that contains all the propane and 78% of the isopentane in the feed. The mole fraction of isobutene in the distillate is 0.378. The bottom stream contains all the n-pentane fed to the unit. Draw the process flow diagram. Perform a Degree Freedom Analysis (DFA).