Investigation of surface tension and viscosity for aqueous solutions of MEA-MeOH and DEA-MeOH

- The surface tension and viscosity of MEA/DEA-MeOH aqueous solution were measured.
- The experiments were modeled satisfactorily by using thermodynamic equations.
- Both the surface tension and viscosity decrease with increasing temperature.
- Increasing mass fraction of MeOH decreases surface tension yet increases viscosity.

The surface tension (γ) and viscosity (η) of monoethanolamine (MEA)-methanol (MeOH) and diethanolamine (DEA)-MeOH aqueous solutions were measured by using the BZY-1 surface tension meter and the NDJ-5S digital rotational viscometer. The temperature ranged from 303.2 K to 323.2 K. The mass fractions of MeOH, MEA and DEA ranged from 0.025 to 0.075, 0.2 to 0.4 and 0.2 to 0.4 respectively. Equations were proposed to model the surface tension and viscosity respectively and both the calculated results agreed well with the experiments. The effects of temperature and mass fraction of MeOH/amines on the surface tension and viscosity were demonstrated on the basis of experiments and calculations.