Solubilities of vegetable oils in aqueous ethanol and ethanol-hexane mixtures |
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| Authors: | Ramalingam Kaparthi K S Chari |
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| Affiliation: | (1) Department of Chemical Engineering, University of Cincinnati, Cincinnati, Ohio;(2) Present address: Department of Chemical Technology, Osmania, University, Hyderabad, India;(3) Present address: Regiona, Research Laboratory, Hyderabad, India |
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| Abstract: | Summary The solubility of vegetable oils in aqueous ethanol depends on the concentration of alcohol and temperature of the system.
At ordinary temperatures even absolute alcohol is not a good solvent for vegetable oils since the solubility is even less
than 10 g. of oil per 100 g. of alcohol. Mowrah, safflower, peanut, and cottonseed oils are soluble in absolute alcohol at
70°C. All the oils investigated are found to be miscible above the boiling point of alcohol even if the concentration is 98%.
In 95% ethanol they are miscible between 90° and 100°C. Addition of a good solvent, like n-hexane, increases the solubility
of oils, and the solubility temperatures are lowered. From the results obtained by various methods of solubility determination
it is found that the apparatus employed in the present work yields more reliable results by eliminating the visual observation
of turbidity temperatures, ensuring vigorous stirring and allowing sufficient amount of time to attain equilibrium conditions
in determining the solubilities of vegetable oils.
Presented at fall meeting, American Oil Chemists' Society, Cincinnati, O., September, 30–October 2, 1957. |
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