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Kinetics of CO2 absorption in aqueous ammonia solution |
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| Authors: | Feng Qin Shujuan Wang Ardi Hartono Hallvard F Svendsen Changhe Chen |
| Institution: | 1. Department of Thermal Engineering, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, 100084 Beijing, China;2. Department of Chemical Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway;1. Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;2. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China |
| Abstract: | The kinetics of CO2 absorption in unloaded aqueous ammonia solution were measured using a string of discs contactor with the aqueous ammonia concentrations ranging 0.9–5.4 kmol/m3 and temperatures ranging 298.3–321.9 K. The reaction rates strongly increase with the concentration and less strongly with temperature. Both the termolecular and zwitterion models were applied in this study as amine solutions. The parameters for both of the models were interpreted. The kinetic rate constants for CO2 absorption in aqueous ammonia were compared with those for other amines and were found to be around 1/10 that for monoethanolamine. The fitting results for the termolecular mechanism seem more robust than those for the zwitterion mechanism from a statistical perspective. |
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