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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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12.4 Analytical Solution for Dilute Systems: Kremser Equation

When the solution is quite dilute (say less than 1% solute in both gas and liquid), the total liquid and gas flow rates will not change significantly since little solute is transferred. The column was shown in Figure 12-1 and the operating equation was given in Eq. (12-6).

To use Eq. (12-6) in a McCabe-Thiele diagram, we assume the following:

1. L/V (total flows) is constant.

2. Isothermal system.

3. Isobaric system.

4. Negligible heat of absorption.

These are reasonable assumptions for dilute absorbers and strippers.

Figure 12-6. McCabe-Thiele diagram for dilute absorber with parallel equilibrium and operating lines

Figure 12-7. McCabe-Thiele diagram for dilute absorber. (L/V) < ...

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