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Nonaqueous and aqueousmixtures of methyldiethanolamine and monoethylene glycol form promisingabsorbents for the combined hydrogen sulfide removal and hydrate control,necessary in natural gas processing. In this direction, the densityand viscosity of the binary and ternary systems were measured andmodeled in the temperature range of T = 283.15–353.15K and at ambient pressure. Excess molar volumes and viscosity deviationsfrom ideality were also calculated. The water content varied from5 to 50 wt % and the amine content from 5 to 90 wt %. Both densityand viscosity were modeled using nonrandom two-liquid-based models.Regarding the density modeling, the average absolute relative deviations（AARDs） were found to be less than 0.4% for the binary subsystemsand equal to 0.3% for the ternary system. Viscosity modeling resultsshow higher AARD, though always lower than 3.0% for both binary andternary solutions.
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