Page 131 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

126

(33)

'13

2
where G is the absorbed (desorbed) component per 1 m of the column cross-
2
section per unit of time in kmol/(m s);
H- height of the packing in m;
3
Cu and Cu - initial and end concentration of CO2 in the water in kmol/m .
To take into account the influence of the end effect A K a in Eq. (33), i.e.
the mass transfer over and under the packing, instead of K LaH in equation
(33), the expression K LaH' + A Kta must be used.

With this expression Eq. (33) can be written as follows:

A Kia=Lln- (34)
Kia

Writing Eq. (34) for two different values of if, Hj and H^ it can be obtained:

(35)
•'U.I
and

'U.2 (36)
-12.2

where the additional indices 1 and 2 are for the first and for the second height of
the packing.
From Eqs. (35) and (36) it follows:

(37)
'Lll '12,2 .

and: