Effect of self-association on liquid—liquid equilibria. Correlation of mutual solubility for methanol—saturated hydrocarbon systems

✍ Scribed by Tomoshige Nitta; Shinobu Takeuchi; Takashi Katayama

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 519 KB
• Volume: 29
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(74)80029-1

✦ Synopsis

The continuous linear association model of the Kretschmer-Wiebe type is used to examine the effects of self-association on liquid-liquid equilibria. The results of the calculation show that the self-association enhances the phase separation and decreases the mole fraction of the self-associating component in a binary mixture at the critical solution point. The application of the theory to the binary systems of methanol-saturated hydrocarbons has yielded good correlations for both the critical solution points and the mutual solubilities at temperatures below the critical. The values of the association constant and enthalpy obtained for methanol are 1030 at 25°C and -3.5 kcal/mol, respectively.

The temperature dependence of the physical interaction parameter for each hydrocarbon is represented by a reduced form. The applicabilities of the theory to both vapour-liquid and liquid-liquid equilibria are better than those of NRTL equation for the systems of methanol-saturated hydrocarbons.