1989 Volume 15 Issue 2 Pages 364-371
Chemical absorption of H2S by aqueous solutions of NaOH in a wetted-wall column was simulated, using a theoretical model based on transport equations for the gas and the liquid phases. Two-step instantaneous reversible reactions and ionic migration of charged molecules in the liquid phase were taken into account in the model formulation. The equations were solved by using a finite-difference technique.
Theoretical absorption rates of H2S obtained for pure and mixed gas flow conditions were compared with experimental ones. Agreement between theory and experiment was excellent.
The distribution of S2- in the liquid film was also quantified, and the effect of the gas-phase mass transfer resistance on the absorption rates was discussed.
