http://pubs.acs.org/doi/abs/10.1021/acs.energyfuels.6b00527
Kinetics of carbon dioxide removal by n-propyl- and n-butyl-monoethanolamine in aqueous solutions Ravindra B. Kanawade, Prakash D. Vaidya, Krishnan Subramanian, Vijay V Kulkarni and Eugeny Y. Kenig Energy & Fuels Publication Date (Web): May 18, 2016 DOI: 10.1021/acs.energyfuels.6b00527 Secondary alkanolamines associated with an alkyl group are potentially attractive post-combustion CO2-capturing solvents. Their reactivity with CO2 is influenced by the nature of the alkyl group that substitutes the hydrogen atom of the amino functional group. In the present work, we measured the rates of CO2 absorption into aqueous solutions of n-propylmonoethanolamine (PMEA) and n-butylmonoethanolamine (BMEA) in a stirred cell reactor under fast pseudo-first order conditions. The concentrations of PMEA and BMEA in the water solutions were changed in the 2-3 kmol m-3 range. It was discovered that, unlike the usual amines, PMEA and BMEA followed overall third-order kinetics. We evaluated the reaction rate constants at different temperatures, viz. 303, 308 and 313 K and discovered that PMEA reacts with CO2 faster than BMEA. Furthermore, we gave an interpretation of the kinetic data using the zwitterion and termolecular mechanisms. Finally, a comparison of the efficacy of the investigated solvents with N-methylmonoethanolamine (MMEA) and N-ethylmonoethanolamine (EMEA) was accomplished. It was found that reactivity of amines diminished in the order EMEA>MMEA>PMEA>BMEA -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
