A mass-transfer process is used to remove ammonia (NH 3 , solute A) from a mixture of


A mass-transfer process is used to remove ammonia (NH3, solute A) from a mixture of NH3and air, using water as the absorption solvent. At the present conditions of operation, the partial pressure of ammonia in the bulk gas phase (pA) is 0.20 atm, and the mole fraction of dissolved NH3in the water (xA) is 0.040. The total system pressure is 2.0 atm, and the temperature is 30°C. At 30°C, the molar solution density is 55.6 kgmole/m3. The film mass-transfer coefficients are kG= 1.0 kgmole/m2· s · atm, and kL= 0.045 m/s for the gas and liquid, respectively. The equilibrium distribution data at 30°C for the NH3-water-air system are given in the table below:PA (atm) CAL (kgmole/m³) PA (atm) CAL (kgmole/m³) 0.105 0.463 0.236 0.145 5.32 0.342 9.71 0.067 7.61 4.09 2.79 0.015 0

a. Prepare an equilibrium distribution plot for NH3 as partial pressure vs. mole fraction (pA €“ xA). 

b. What is kx

c. What are the interface compositions xA,i and pA,i? What are x*A and p*A

d. What is KG, the overall mass-transfer coefficient based on the gas phase? 

e. What is the flux NA for this process?

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Fundamentals Of Momentum Heat And Mass Transfer

ISBN: 9781118947463

6th Edition

Authors: James Welty, Gregory L. Rorrer, David G. Foster

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