The limiting activity coefficients of benzene, pentane, hexane, and heptane in the mixed extractants morpholine-ethanolamine and morpholine-ethylene glycol over the entire range of their miscibility were measured by the head space analysis technique at 40degreesC. Positive deviations of the selectivity of these extractants from calculated values with respect to separated hydrocarbons were revealed. The density and viscosity of the binary morpholine-ethanolamine and morpholine-ethylene glycol solvents were determined over the entire concentration interval at temperatures of 20, 40, and 60degreesC. The concentration plots of changes in the free energy, enthalpy, and entropy of viscous flow of the solutions examined were calculated. The liquid-vapor equilibrium in the binary morpholine-ethanolamine and morpholine-ethylene glycol systems was studied under isobaric conditions at 760 mmHg.