Study on mass transfer and kinetics of CO2 absorption into aqueous ammonia and piperazine blended solutions

A small wetted wall column (WWC) was used to study the kinetics of CO2 absorbed in PZ and NH3/PZ blended solution. The experiments of CO2 absorption into 0.1-0.4 M PZ and 0.53-4 M NH3/0.1-0.4 M PZ mixed solution at 10-40 degrees C have been done in wetted wall column under the driving force of 8-25 kPa in this paper. The 'interface concentration corrected-pseudo first order' mass transfer model and 'Ternary-termolecular' reaction mechanism were proposed to describe the CO2 absorption into NH3/PZ system for the high driving force and low PZ concentration condition. Both of the models in this study used for CO2 with NH3/PZ blended solution were in a good agreement with the experimental results. (C) 2012 Elsevier Ltd. All rights reserved.