Volatility of monoethanolamine and tetramethylethylene diamine in aqueous solution for CO2 capture at different loading

Abstract

Amine volatility is an important parameter to be considered when used as a solvent for CO2 capture. If the volatility is high, there is a need to inject the solvent so as to compensate the loss consequently the cost of the process increases. In this work CO2 solubility and amine volatility in loaded and non-loaded aqueous 30 wt% MEA (monoethanolamine), 10, 30 and 50 wt% TMEDA (N,N’,N’-tetramethylethylene diamine) were studied in the range of temperature (293 to 353 K) and pressure (2 Pa–400 kPa). Volatility measurements, in terms of partial pressures, were performed using a static apparatus with on-line analysis of the gas phase by GC to determine CO2, water and amine partial pressures above the solution. The dissolved CO2 in the liquid was determined by titration. The experimental data of the system (water + MEA), (water + TMEDA), and (water+MEA+CO2) are in a good agreement with literature data. No data for comparison were found for the system (water + TMEDA + CO2). Experimental partial pressures of the amines (PMEA and PTMEDA) were correlated using the empirical models developed by (Xu, 2011). Both models represent well the experimental data.