In Example 13.1, an absorber with an absorbent rate of \(237 \mathrm{kmol} / \mathrm{hr}\) and 4 equilibrium stages absorbs \(90 \%\) of the entering \(n\)-butane. Repeat the calculations for:

(a) \(474 \mathrm{kmol} / \mathrm{hr}\) of absorbent (twice the flow) and four equilibrium stages.

(b) Eight equilibrium stages (twice the stages) and \(237 \mathrm{kmol} / \mathrm{hr}\) of absorbent.

Which case results in the most absorption of \(n\)-butane? Is this result confirmed by the trends of the curves in the Kremser plot of Figure 13.2.

Data From Example 13.1:-

Figure 13.2:-

Transcribed Image Text:

The feed gas to an absorber at 105F and 400 psia contains 150 kmol/hr of methane, 350 kmol/hr of ethane, 250 kmol/hr of propane, and 50 kmol/hr of n-butane. The absorber is to absorb 90% of the n-butane with an oil at 90F and 50 psia. With the Kremser