Question

2. A gas mixture at 1.0 atm pressure containing air and solute A is contacted in a single stage mixer continuously with pure water at 30 °C. The two exit gas and liquid streams reach equilibrium. The inlet gas flow rate is 100 kg mol/h, with a mole fraction of A being 0.20. It is desired that the exiting gas contain an A mole fraction of 0.01. Calculate the flow rate of liquid required to achieve this separation. Assume that the water doesn't vaporize to the gas phase. Use y-6.2x, as the equilibrium curve, where x and y are mole fractions of A in liquid and vapor respectively at equilibrium. 3. Consider the same system as given in problem 2. But instead of a single stage now there are multiple stages and the streams are contacted in a cross current fashion, with every stage getting a fresh supply of pure water at 400 kg mol/hour. Inlet gas flow rate remains the same at 100 kg mol/h. Calculate the number of stages and the total water flow rate required for this separation 4. Repeat problem 3. But now the stages are arranged in counter-current fashion. Input liquid flow rate is 800 kg mol/hour and is pure water. Calculate the number of stages using a. No dilute solutions assumption. b. Dilute solutions assumption Kremser equations c.

Answer 1

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