Summary
The vapor pressure equilibrium of stearic acid has been determined at 180°C. in peanut oil and highparaffin solutions. Positive deviation from Raoult’s law has been observed in both of the systems; it was however essentially stronger in the nonpolar high-paraffin.
Extrapolation of the vapor pressures obtained in paraffin to infinite dilution indicated that monomer stearic acid in free state would have a vapor pressure of 3.9 mm. Hg. at 180°C. in comparison with 0.80 mm. of the pure stearic acid itself, which is a mixture of monomer and dimer molecules.
Quantitative relationships could be established between degree of association and vapor pressure. For pure dimeric acid at 180°C. a vapor pressure of 0.015 mm. Hg. has been calculated.
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Sarkadi, D.S. Vapor pressure equilibrium of stearic acid in triglyceride and in high paraffin solutions. J Am Oil Chem Soc 35, 479–481 (1958). https://doi.org/10.1007/BF02539922
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DOI: https://doi.org/10.1007/BF02539922