液液界面传质过程的激光干涉法研究

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

为了研究液液传质过程的界面现象及传质特征,采用实时激光全息干涉技术,根据不同初始浓度时乙醇通过油水界面传质过程的全息干涉图,得到了传质过程水相侧的浓度分布,据此求出了近界面浓度和基于浓度的传质系数,并关联了近界面浓度与主体相溶质浓度的关系。建立了界面能随溶质浓度改变的函数关系,计算结果与实验值吻合良好。研究结果表明,液液静止界面传质过程基本符合双膜理论,溶质的加入能改变界面性能,传质过程界面处于非平衡状态。

Aiming at the interracial 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 interracial 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.