Page 64 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

59

or

G = K Y.a e.HAY m, (199)

where

L
(200)

AY 2

is the average driving force of the mass transfer process.
In the same way the corresponding equation for the mass transfer can be
obtained with the driving force taken for the liquid phase.

G = K x.a e.H.AX av, (201)

where K xis the mass transfer coefficient for the liquid phase, £±X m is
calculated by the equation;

(202)
fa

Here:

AX,=X*-X It (203)
and

AX 2=Xj-X 3. (204)

Following the above given deriving of equations (200) and (202) when
3 3
the concentrations are in kg/m or in mol/m , the following equations can be
also developed: