Example of absorption calculation
Mass transfer - Permanent contact operations

A gas consisting of air and hydrogen sulfide H₂S (in low concentration) is to be purified using a packed column. The operating conditions are as follows:

• water flow: 10 m³ · h^–1;

• gas flow (air): 100 m³ · h^–1;

• the temperature is a constant 20 °C ;

• the pressure is 100 kPa ;

• we use a filling of 1.25 cm Raschig rings.

The objective is as follows:

• reduce hydrogen sulfide concentration by a factor of 100 $\left(C_1^1=\mathrm{0,01}\right)$; steady-state operation is assumed;

• estimate the number of transfer units in the operation;...