Simultaneous Absorption of CO₂ and H₂S into Aqueous Sodium Hydroxide Solutions

Abstract

A numerical solution was obtained for the basic nonlinear partial differential equations which represented the rates of simultaneous absorption of CO₂ and H₂S into aqueous sodium hydroxide solutions. In this situation, it was assumed that the reaction between dissolved CO₂ and OH^- ion was (1, 1) th order, and that the rates of any other reactions in the liquid phase were instantaneous.
Experiments were carried out using wetted-wall columns for the system CO₂-H₂S-NaOH aq. sol. over the range of gas-liquid contact time 0.02-1.5 sec, partial pressure of CO₂ 0.02-0.9 atm and that of H₂S 0.05-0.1 atm.
The experimental values of absorption rates of CO₂ and H₂S were in good agreement with numerical solution in this work.