What are the effects on the concentrations of the exit gas and liquid streams of the following changes in the operating conditions of the column of Example 20.2? 

(a) A drop in the operating temperature that changes the equilibrium relationship to y, = 0.6x. Unchanged from the original design: N. L/V. y, and x, 

(b) A reduction in the L/V ratio from 1.5 to 1.25. Unchanged from original design: temperature, N. y. and x. 

(c) An increase in the number of ideal stages from 5.02 to 8. Unchanged from original design: temperature, L/V. y_b. and x_a.

Example 20.2

Ammonia is stripped from a dilute aqueous solution by countercurrent contact with air in a column containing seven sieve trays. The equilibrium relationship is y_e = 0.8x_e, and when the molar flow of air is 1.5 times that of the solution 90 percent of the ammonia is removed.