The purge gases from a synthetic ammonia plant contain 4% ammonia by volume and 96% hydrogen, nitrogen, argon and other inerts. This gas is to be scrubbed at 5 atmosphere pressure with water in a bubble plate tower maintained at 68°F by cooling coils. With water and inert gas rates of 0.88 and 4 lb/min-ft2 of tower cross section respectively, how many theoretical plates will be required to produce a solution containing 13% ammonia by weight? The average molecular weight of the inert gas is 21. Data: the following gives the equilibrium partial pressure of ammonia solutions at 68°F 166 10 12 Partial pressure, torr Pound NH3/100-gram H2O 1 19.2 31.7 1.5 2.5 50 3.75 69.6 5

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