In this research. a nonequilibrium dynamic stage model has been developed for reactive absorption of carbon dioxide by carbonated ammonia solutions. The model considers mass transfer between gas and liquid phases in both directions employing dynamic film model theory. Experimental data of carbon dioxide reactive absorption by partially carbonated ammonia solution has been used to validate the model. The data were obtained from a pilot plant absorption column. The model equations were discretized in column height direction. Simulations were performed,while either a film model or an enhancement factor was incorporated into the process model. The model predictions for both cases were compared with the experimental data. The comparison showed that simulation results were more accurate when film model has been used. (C) 2008 Elsevier B.V. All rights reserved.