An approximate analytical method based on steady-state Film Theory enables accurate, computationally efficient prediction of carbon dioxide absorption and desorption rates. The method is based on a particular scheme for linearizing the coupled differential equations that govern diffusion with multiple reversible reactions. Calculated interphase transport rates agree closely with those obtained via exact numerical methods; and this is true whether the reactions are fast or slow; when their characteristic times differ by orders of magnitude; and irrespective of transport and reaction driving forces. The method was recently applied [Meldon and Morales-Cabrera, Chem. Eng. J., 2011 , 171, 753] to the analysis of carbon dioxide absorption in and desorption from aqueous monoethanolamine, prior modeling of which had relied on numerical methods. It is extended here to carbon dioxide capture with solutions of amino acid salts.

Analysis of carbon dioxide absorption in and desorption from aqueous amines and amino acid salts

243rd National Meeting (2012)

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