Determination of the Solubility Parameter of Soybean Oil by Inverse Gas Chromatography

The solubility parameter ofsoybean oil, 62, has been determined by the technique of inverse gas chromatography (IGC). Using soybean oil as the stationary phase, solute retention volumes were precisely determined as a function of temperature using 22 solute probes of varying solubility parameter (6]). Solvent (oil)-solute interaction parameters, X, were also calculated from the solute retention data and indicate complete miscibility of the solute probes with the soybean oil at conditions of infinite dilution. The X values and their dependence on temperature were used to compute 62 at 59, 79, 101, and 123°C. Over this temperature interval, the 62 decreased from 7.9 to 6.9 cal] lcm with decreasing temperature, a trend consistent with the loss of cohesional energy density in the liquid soybean oil.