Question

Problem 1 (20 points)) In absorption, the absorbent is stripped to an extent that depends on its K-value. In stripping, the stripping agent is absorbed to an extent depending on its K-value. In the figure below, it is seen that both absorption and stripping occur. Which occurs to the greatest extent in terms of kmol/h? Should the operation be called an absorber or a stripper? Why? Exit gas (25°C, 90 kPa) Liquid absorbent (25°C, 100 kPa) kmol/h kmol/h Argon 6.9 Water 194 0, 144.291 N 535.983 Water Acetone 0.05 22.0 N Feed gas (25°C, 101 kPa) kmol/h Argon 6.9 0, 144.3 N 536.0 Water 5.0 Acetone 10.3 Exit liquid (25°C, 100 kPa) kmol/h 0 0.009 N 0.017 Water 1926.0 Acetone 10.25

Answer 1

According to the given figure this process is Absorption process.

Here water, absorb 10.25 kmol/hr acetone that is about 99.5% of acetone feed with feed gas.

Where as stripping of water in gas is-

(22-5)=17kmol/hr

It is only 0.8% of water feed as absorbent.

So we can say it is a Absorption process. Where acetone is absorbed by water.