A two-stage process is used to separate H₂S from a gas containing 96% H and 4?? H₂S by volume. ?The H₂S 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 fractions

(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 04, neglecting evaporation of solvent in both columns. (See flowchart.)

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GA Air + H₂S Clean air Product gas (G₁) Feed gas H₂ + H₂S STRIPPER 40°C ABSORBER 0°C (L₁) (L₂) (L₂) 40°C HEATER 0°C Data on Process Streams G₁: 100 mol/h 96% H₂, 4% H₂S, 1.8 atm G₂: 99.9% H₂, 0.1% H₂S G3: 200 mol air/h G₁: 40°C. 1 atm L₁: 0.200 mole% H₂S L₂: Assume at equilibrium with G₂ at 0°C