9.20. Distillation calculation by the approximate FUG method. A feed at its bubble-point at 100 psia is fractionated at 100 psia to produce a distillate containing 5% of the isobutane (HK) in the feed and 3.5% of the propane (LK) in the bottoms. Use a process simulator with the SRK EOS to calculate N.minRimin, N for R/Rmin = 1.2 and the feed stage by the FUG method. The feed is as follows: Component kmol/h in the feed Ethane Propene Propane Isobutane Isobutene n-Butane 60 90 180 180 250 240