| Abstract
| - Experimental liquid−liquid miscibility temperatures as a function of mole fraction are reported for binary systemsformed by methanol as common component with hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane,2,3-dimethylbutane, and cyclohexane. All the studied coexistence curves present an upper critical solutiontemperature (UCST). The UCST of the binary systems presents a clear dependence with the molecular shape ofthe hydrocarbons (e.g., the solubility of the alkanes in methanol increases as branching increases in the structuralisomers); hence, 2,2-dimethylbutane shows the lowest UCST with methanol. Cyclohexane presents the highestUCST with methanol (i.e., it shows the lowest mutual miscibility for the six studied systems). Values of theUCST have been calculated with the Weimer−Prausnitz modification for polar components of Hildebrand's RegularSolutions Theory. The predicted UCSTs compare well with those obtained experimentally.
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