CO2 absorption in aqueous NH3 solutions: Novel dynamic modeling of experimental outcomes

•CO2 chemical absorption with aqueous NH3 is experimentally and theoretically investigated.•The process dynamics is simulated for the first time by a deterministic mathematical model.•The model is capable to successfully predict ion speciation and CO2 capture efficiency evolution.•The model is validated by predicting experimental output under different operating conditions.•The possibility to use the model to optimize columns operation/regeneration cycle is discussed.