Determination of solubility parameters and thermodynamic properties in hydrocarbon-solvent systems by gas chromatography

Abstract

-Gas chromatography used to calculate the specific retention volume of several hydrocarbons in different chromatographic liquid phases (Squalane, Carbowax-400, Carbowax-1500, Carbowax-4000, Amine-220, Dinonyl phthalate, Tributyl phosphate and Trixylenyl phosphate). Some thermodynamic parameters, such as enthalpy of sorption and Flory-Huggins parameters relating the interaction between liquid phases and solutes, were also calculated from the determined retention volumes. Liquid phase solubility parameters of Squalane, Carbowax-400, Carbowax-1500 and Carbowax-4000 at 80 ºC as well as the polar and apolar components were calculated too. A new model was proposed to correlate polar contribution to the solubility parameter of a liquid phase with the specific retention volume of a solute in this liquid phase.

Determination of Solubility Parameters for the p-Xylene Oxidation Products

“…We have used eq to determine δ for the compounds involved in the PXOX reaction. There are a few other methods (namely, polymer swelling, surface tension, refractive index, inverse gas chromatography, infrared spectra, and molecular dynamics, which relate to cohesion parameters) that could be used to determine δ. However, the viscosity method seems to be fast and convenient, compared to all of the above methods.…”