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Vapor pressure equilibrium of stearic acid in triglyceride and in high paraffin solutions
Author(s) -
Sarkadi D. Szabo
Publication year - 1958
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02539922
Subject(s) - stearic acid , vapor pressure , monomer , chemistry , dilution , vapor pressure osmometry , dimer , extrapolation , thermodynamics , polymer , organic chemistry , mathematical analysis , physics , mathematics
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.