Ammonia partial pressure over aqueous solution

Figure 9-76. Partial pressure of ammonia over aqueous solutions of ammonia. Used by permission of Leva, M., Tower Packings and Packed Tower Design, 2nd Ed., U.S. Stoneware Co. (now, Norton Chemical Process Products Corp.) (1953).

Equilibrium partial vapor pressures over solutions of the ammonia-sulfur dioxide-water system have been reported by Johnstone (1935). His data cover temperatures from 35° to 90°C as well as concentrations in the range likely to be encountered in a cyclic process in which the solution is regenerated by distillation. Johnstone proposed the following equations to predict the partial pressure of sulfur dioxide and ammonia over aqueous solutions ... 

An ammonia-air mixture (0.02 mole fraction ammonia) is to be scrubbed with water at 20° C. Final mole fraction is 0.00041 ammonia. Both the gas and liquid flow rates are 1.36 x 10 kg/m sec. Equilibrium data for partial pressures of ammonia over aqueous ammonia solutions are ... 

Figure 834 Equal-temperature reference-substance graph for partial pressures of water over aqueous ammonia solutions. Reference substance is water.

---