Effective absorption and stripping factors

Example 2 Calculation of Kremser Method For the simple absorber specified in Fig. 13-44, a rigorous calculation procedure as described below gives results in Table 13-9. Values of were computed from component-product flow rates, and corresponding effective absorption and stripping factors were obtained by iterative calculations in using Eqs. (13-40) and (13-41) with N = 6. Use the Kremser method to estimate component-product rates if N is doubled to a value of 12. 

Figure 8-59. Effective absorption and stripping factors used in absorption, stripping and fractionation as functions of effective factors. Used by permission, Edmister, W. C., Petroleum Engr. Sept. (1947) to Jan. (1948).

The effective absorption and stripping factors in each zone are approximately... 

Effective absorption and stripping factors for each component are computed for the enricher and exhauster sections from (12-101) and (12-102) for terminal-stage conditions based on the above calculations. 

In order further to simplify the computations, Edmister [13] has written the Horton-Franklin equations in terms of average or effective absorption and stripping factors instead of the /I s and iS s for each tray. Thus, for absorption, Eq. (8.102) becomes... 

Figure 9-1. This graph shows the absorption and stripping factors, Ea and Es< versus effective values, and Se (efficiency functions). (By permission, W. C. Edmister, Petroleum Engineer, Sept. 1947 Series to Jan. 1948.)... 

The separation factor in the Kremser method is an effective absorption factor, for absorption and a stripping factor, 5, for stripping, rather than a relative volatility as in the FUG method for distillation. These two factors, which are different for each component, are defined by ... 

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