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Question: a spiralwound nonporous cellulose acetate membrane separator is used to...

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A spiral-wound, nonporous cellulose acetate membrane separator is used to separate a gas containing H2, CH4, and C2Hs. The permeate is 95 mol% pure H2 and contains no ethane. The relative split ratio (separation factor, SP) for H2 relative to methane is 47. Using the fol lowing data and an infinite surroundings temperature of 80°F, compute the: (a) irreversible production of entropy in Btu/h-R; (b) lost work in Btu/h; and (c) minimum work of separation in Btu/h. Why is it neg ative? What other method(s) might be used to make the separation? Stream flow rates and properties Feed flow rates, lbmol/h 2 CH4 C2H6 3,000 884 120 Feed Permeate Retentatee Vapor 80 50 8,380 4.222 Vapor Phase condition Temperature, °F Pressure, psia Enthalpy, Btu/lbmol Entropy, Btu/lbmol-K Vapor 80 80 365 8,550 1.520 365 8,890 2.742

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