Prediction of interfacial tension of binary liquid mixtures from mutual solubility by the uniquac method

✍ Scribed by Buqiang Li; Jufu Fu

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 822 KB
• Volume: 44
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(89)80029-6

✦ Synopsis

Based on a model of an interfacial region of finite thickness, where all the system properties vary in's direction normal to the phase boundary, a method of predicting interfacial tension from the mutual solubility for binary mixtures has been developed. The volume contribution and surface contribution to the total free energy of mixing are considered separately and summed together to give the total free energy of the nonuniform mixture in the region. The UNIQUAC method is employed to calculate the activityxoefficients required for calculating the former contribution and the UNIQUAC parameters, Auij (Auij = uij -ujj), are utilized in the calculation for the latter. The overall average deviation of the predicted interfacial tensions from the observed values for 45 systems is 1.4 x lo-' N/m. The maximum deviation is 5.1 x 10P3 N/m. The number of layers of molecules in the interfacial region is estimated to be tw+four.