Data for the distribution of carbon dioxide between the vapor and aqueous solutions of four mixtures of monoethanolamine (MFA) and methyldiethanolamine (MDEA) have been obtained at 25, 40, 80 and 120-degrees-C over a range of pressures from 100 kPa to 20 MPa. Partial pressures of CO2 ranged from 0.001 to 19 930 kPa. Enthalpies of reaction of CO2 in the solutions have been calculated from the solubility data.