Absorption Factor Shortcut Method of Edmister

An absorption factor for each component i on each tray j is defined as 

Similariy a stripping factor for each component is defined as 

The ratio of bottom and oveihead flow rates for each component is 

The effective absorption and stripping factors in each zone are approximately 

A certain number of initial estimates must be made when applying Edmister s method which are improved by iteration. 

A certain number of initial estimates must be made when 

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Feintuch and Treybal also compared shortcut calculation methods, based on Eq. (6.3-21), against the rigorous computer program for a f r-component system. Two shortcut methods were used—a simple approach and an Edmister-type approach. In the simple approach, (7 and L values are used which correspond to the conditions of the inlet gas and liquid streams, arid the equilibrium constants used are based on the temperature of the inlet liquid. In the Edmister-type approach, G, L, and m are evaluated separately at the top and bottom of the tower. The Edmister equation (Eq. (6.2-10)] is used, excqrt that A, corresponds to the absorption fiKtor at the top of the packing and /(/ , to the factor at the bottom of the packing instead of absorption fiKtors for the top and bottom trays, respectively. 

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