Amino acid salts for CO2 capture at flue gas temperatures

The amino acid salt potassium taurate has potential for use as a high temperature absorbent for post combustion CO2 capture, because of its low volatility and high absorption rate. In this study, the densities and viscosities of 2-6 M taurate solution were determined over the temperature range of 293-353 K. We found that the CO2 solubility of taurate solutions, measured using a stirred cell reactor, is comparable to that of alkanolamines at high temperatures. The absorption rate of CO2 into CO2-free arid CO2-loaded Laurate solutions was determined using a wetted-wall column. The K-G of 4 M Laurate at 353 K is similar in magnitude to the K-G of 7 m monoethanolamine (MEA) at 313 K. We also found that the K-G of Laurate decreased with increased CO2 loading, although the K-G values of [aurae solutions are still comparable to CO2-loaded 7 m MEA solution. The reaction rate constant of [aurae carbamate formation in this work agrees well with published values. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.