Page 236 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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Table 15. Values and precision of the constants in Eq. (114)
Constants Value Confidence region Mean error, % Maximum error, %
0.37 ±0,0956
K, 4.5 ±0.1291
I 0.45 ±0.0619 4.5 10
n 0.17 ±0.0213
P -1.03 ±0.0248

3 2
where Lh is in m /(m h) and AP in mbar.
3
At Li/cKQ.6 m /(m h), CJ= 21.2 and x 2 = 0.11.
3
At V«>0.6 m /(m h), c 2= 22.5 and x 3 = 0.23.
The comparison between the calculated curves using Eq.(llS) and the
experimental data is presented in Fig. 28.
Based on experimental data for rectification, obtained by using 3 sizes
of random ceramic Raschig rings (6.25, 9.00 and 10.80 mm), Senol [290]
presented the following equation:

a

where cr^ is the surface tension of the light component in N/m;
(T h is the surface tension of the heavy (less volatile) component in N/m;
% Fl=(G/Gj}100%- flooding ratio;
2
G- gas mass superficial velocity, kg/(m s);
2
Gj- gas mass superficial velocity at the flooding point, kg/(m s);
Ca L = - capillary number for the liquid;

g cj- force/mass conversion factor (dimensionless);
The following systems are used in the experiments:
1. Trychloreethilene/n-heptanehe (negative);
2, Methylzyclohexane/toluene (positive);
3, N-pentane/toluene (positive);
4. Benzene/toluene (neutral).
The values of the constants in Eq. (116) are presented in Table 16.