Separations in Packed Towers

In its simplest form, the rate of mass transfer per unit area across these films is 

A mixture of a given composition is to have 60% of its n-butane removed by scrubbing with an oil in a 4-tray tower operating essentially iso thermally at a pressure of 4 atm. The oil feed rate per 100 mol of feed gas will, be found. The data are 

The Kremser-Brown formula (Eq. (13.143)) for the fraction The results are tabulated and show that the calculated value, 

Estimate that 27 mol of gas is absorbed. Let Ld represent the lean oil rate For nC4 

Equimolal counterdiffusion between the phases, as in distillation with McCabe-Thiele approximations. 

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

Similarly a stripping factor for each component is defined as 

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

The effective absorption and stripping factors approximately in each zone are 

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

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Separations in Packed Towers 398 Mass Transfer Coefficients 399 Distillation 401... 

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