Rates of CO2 absorption into mixtures of methyldiethanolamine (MDEA) and beta,beta'-hydroxyaminoethyl ether (diglycolamine(R) DGA) were measured in a wetted-wall column reactor at 25-100 degreesC with CO2 loading from 0.015 to 0.55 mol CO2/mol of reactive solvent, The mass transfer rates were modeled by approximate surface renewal theory with time-mean concentrations and fluxes. The rates in the mixtures were relatively insensitive to the reaction rate parameters, but strongly dependent on the diffusivity of liquid-phase reactants and reaction products and on thermodynamic interaction parameters, especially at temperatures greater than 60 degreesC. Regressed diffusion coefficients For the liquid-phase reactants and reaction products are comparable to previously measured values for similar molecules. The regressed values for the electrolyte interaction parameter of water-carbamate salt are comparable to reported values of the equivalent parameter for the system monoethanolamine-MDEA.