Question

Asked Oct 18, 2019

Please explain how to work through this problem in detail. No actual calculations are neccessary.

A packed tower is being used to scrub ammonia out of a stream containing only 3% of that gas. The tower contains 1-cm Raschig rings; it is 50 cm in diameter and 4.3 m high. The gas flow of 0.93 kg/sec is at 30 degrees C and is largely air at 100% relative humidity and 1,100 mm Hg; it leaves the tower with only 2.2x10^-6 % NH_3. The liquid flow of 6.7 kg/sec is also at 30 degrees C. The Henry's law constant under these conditions is y_NH3 = 0.85x_NH3. What is the mass transfer coefficient K_G in this tower?

Step 1

In the given problem there is a packed tower consist of Raschig rings as packing material which acts as theoretical plate to bring the two different streams (phases) in contact which results into the scrub of NH_{3} from gas stream to liquid stream under given condition.

Step 2

Design based on individual mass transfer coefficient:

Step 3

Mass balance over the differentia...

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