Study on the liquid-liquid interfacial mass transfer process using holographic interferometry

Aiming at the interfacial phenomena of liquid-liquid mass transfer and its characteristic,by using of the real-time holographic technique,the concentration distributions on the aqueous side were obtained according to holographic diagrams of mass transfer of ethanol through the interface of oil and water at different initial concentrations.Furthermore,the concentrations near the interface and the mass transfer coefficients were attained.A correlation of the concentration near the interface to the concentration of the solute in the oil side was proposed.An approach of interfacial energy with solute concentration was established,and the calculated results are in good agreement with the experimental data.It shows that the liquid-liquid mass transfer process is approximately in accordance with two-film theory,the interfacial performance may be changed by the addition of the solute,and the liquid-liquid interface is non-equilibrium thermodynamically during mass transfer process.