6.33. A two-stage process is used to separate H2S from a gas containing 96% H2 and 4% H2S by volume. The H,S is absorbed in a solvent, which is then regenerated by air in a stripping column. The...

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Extracted text: 6.33. A two-stage process is used to separate H2S from a gas containing 96% H2 and 4% H2S by volume. The H,S is absorbed in a solvent, which is then regenerated by air in a stripping column. The Henry's law constant for the absorption of H2S in the solvent at 0°C is 22 atm/mole fraction. Air + H,S Data on Process Streams G: 100 mol/h 96% H2, 4% H,S, 1.8 atm STRIPPER 40°C 40°C Ga G: 99.9% H2, 0.1% H,S Clean air G: 200 mol air/h HEATER Product gas G: 40°C, 1 atm ABSORBER 0°C 0°C L: 0.200 mole% H,S 4: Assume at equilibrium with G2 at 0°C Feed gas H, + H,S (a) Briefly explain in your own words the functions of the three process units. Include in your explanation the purpose of the air in the stripper and the reason the stripper operates at a higher temperature than the absorber. (b) Calculate the molar flow rate of pure solvent and the volumetric flow rate of the gas at Ga. neglecting evaporation of solvent in both columns. (See flowchart.)