Absorption

To promote the solute removal rate and to enhance the efficiency of the gas absorber, sometime a reactive solvent is used.

• Acid gases such as \(\ce{H2S}\) and \(\ce{CO2}\) are often contacted with solvents containing an alkaline component such as sodium hydroxide, or an ethanolamine.

• The absorption of a basic solute such as ammonia can be promoted by reacting it with an acidic solvent.