Solubility of carbon dioxide in aqueous solution of monoethanolamine or 2-amino-2-methyl-1-propanol: Experimental measurements and modelling

Despite the importance of the accurate measurement of vapour-liquid equilibria (VLE) data, the reported values, even for well-studied systems such as MEA-H2O-CO2, are scattered. This work centres on the development of an experimental method to measure accurately the VLE of various aqueous amine systems. A static-analytic type of VLE apparatus has been constructed and employed to measure the VLE of CO2 in aqueous monoethanolamine and 2-amino-2-methyl-1-propanol. Gas chromatography was used to analyse the liquid phase compositions. The setup has been validated against literature data for 30 mass% MEA (monoethanolamine) at T=313 and 393 K and was shown to be capable of generating reliable and repeatable data. New measurements for 30 mass% aqueous AMP (2-amino-2-methyl-1-propanol) solutions are also presented at temperatures between 313 and 393 K and a total pressure range of 23-983 kPa. A quasi-chemical model has been employed to interpret the experimental data for the MEA-H2O-CO2 and AMP-H2O-CO2 systems. The average absolute deviation (Delta(AAD)) between model prediction and experimental data is within 7%. (C) 2011 Elsevier Ltd. All rights reserved.