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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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D. Problems

*Answers to problems with an asterisk are at the back of the book.

D1. A 5-stage countercurrent absorber is used to absorb acetone from air into water at 3 atm pressure and 20°C. The total inlet gas flow rate is 100 kmol/h. The inlet gas is 0.004 mole fraction acetone. The inlet liquid contains 0.0001 mole fraction acetone. Outlet gas is 0.0002 mole fraction acetone. Assume total liquid and gas flow rates are constant. At 20°C the Henry’s law constant for acetone in water is H = 1.186 atm/(mole fraction). Find the liquid flow rate required and the mole fraction acetone in the outlet liquid.

D2. We are absorbing hydrogen sulfide at 15°C into water. The entering water is pure. The feed gas contains 0.0012 mole frac hydrogen sulfide ...

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