Absorber multistage cascade

Absorber Using the nomenclature introduced for multistage cascades, and the results of Example 3.7 ... 

Let s use the operating line to analyze a multistage cascade absorber. We begin in Figure 4.43 by drawing the operating line based on its slope, Fou/Fair, and its intercept,... 

As a footnote, considerable simplification in the mathematical separation representations could result by assuming that the respective molar flow rates remain constant throughout the membrane unit. Such is the practice in distillation calculations, where there is mass transfer in both directions. The assumption is similarly made in absorber or stripper calculations, where only one key component is involved. This condition, called constant molal overflow in distillation and absorber and stripper derivations and calculations, may also be accommodated in the case of multistage or cascade membrane calculations, as derived and utilized... 

How do we analyze the process in Figure 4.41 We could use the graphical method developed for multistage absorbers, such as in Figure 4.38. However, this method is awkward for analyzing cascade absorbers. To start at the bottom tray we need to know the concentration of benzene in the air entering the bottom tray (no problem) and the concentration of benzene in the oil entering the bottom tray (problem). We don t... 

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See also in sourсe #XX -- [ ]

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