fuel cell automotive systems are being considered that will require hydrogen of 95% purity. A refinery stream 800,000, containing 72.5% H2, 25% CH4 and 2.5% C2H is available. To convert this gas to required purity, oil absorption, activated charcoal absorption and membrane separation are being considered. For oil absorption an available n-octane stream can be used as the absorbent. Because the 95%H2 must be delivered at less than 375 psia, the absorber will operate at 400 psia and 100F. If at least 80% of the hydrogen fed to the absorber is to leave in the exit gas, determine the following: (a) the minimum absorbent rate in gpm; (b) the absorbent rate if 1.5 times the minimum amount is used; (c) the number of theoretical stages; (d) the stage efficiency for each of the three species in the feed gas, using the O'Connell correlation; (e) the number of trays actually required; and (f) the exit gas composition, accounting for octane stripping.