Absorption Data and Modeling of Carbon Dioxide in Aqueous Blends of Bis(2-hydroxyethyl)methylamine (MDEA) and 2,2-Iminodiethanol (DEA): 25 % MDEA + 25 % DEA and 30 % MDEA + 20 % DEA
Résumé
This report contains CO2 loading data for the solvent absorption of CO2. Two amine blends were studied extensively using a static analytic apparatus described herein. The blends were 25 wt% MDEA-25 wt% DEA-50wt% H2O and 30 wt% MDEA-20 wt% DEA-50 wt% H2O. A minor study was conducted on a 50 wt% DEA-50 wt% H2O solvent as well. Different CO2 partial pressures were studied, ranging from 0.05 to 1.05 MPa. Nitrogen gas was used for achieving desired system pressure. System pressures ranged from 0.5 to 1.5 MPa. Solvent absorption was studied at 363.15 and 413.15 K. The data is presented and discussed in this report, both tabulated, as solubility curves and partition coefficient curves. Conclusions drawn from the CO2 liquid loading data are that increasing temperature greatly reduces the absorption capacity of the solvents studied. The amine blend of 25 wt% MDEA-25 wt% DEA-50 wt% H2O produced the best loading performance of all the solvents studied, as well as the literature data that was used for comparison. This proved that higher concentrations of DEA in the blend, is beneficial in increasing CO2 liquid loading in relation to CO2 partial pressure. The data was also compared to similar systems in literature, as well as in terms of partition coefficients, showing some contradictory and varying results. The literature data found also varied among sources. A wider and more standardised method of experimentation is required to confirm the results.
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