Gas absorption with consecutive chemical reaction: Absorption of carbon dioxide into aqueous amine solutions

Experiments were carried out over a wide range of contact time for the absorption of carbon dioxide into aqueous amine solutions. It was suggested from the experimental results with a laminar liquid‐jet, a wetted wall column and a quiescent liquid absorber that the present absorption processes should be analyzed by a gas absorption with the consecutive reaction of the form of A + 2B →kI R and A + R →kII Products. The values of rate constants for the second‐order first reaction step (k1) for the diethanolamine and triethanolamine were estimated as 1340 and 16.8 1/mol‐sec, respectively. The value of rate constant for the second reaction step was found to be constant irrespective of the liquid reactant.