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.)

GA Air + HS Clean air Product gas (G) Feed gas H + HS STRIPPER 40C ABSORBER 0C (L) (L) (L) 40C HEATER 0C Data on Process Streams G: 100 mol/h 96% H, 4% HS, 1.8 atm G: 99.9% H, 0.1% HS G3: 200 mol air/h G: 40C. 1 atm L: 0.200 mole% HS L: Assume at equilibrium with G at 0C