Gas–liquid chromatographic studies of thermodynamic interactions in ternary systems comprising dinonylphthalate + trinitrotoluene + volatile hydrocarbon

Abstract

Gas–liquid chromatographic partition coefficients have been determined at 82°C for eleven hydrocarbons, aliphatic and aromatic, in the stationary phases di(3,5,5-trimethylhexyl)phthalate (DNP), and 2,4,6-trinitrotoluene (TNT), and in the mixed stationary phases. The Flory—Huggins model is used to derive a simple relation between partition coefficients in the mixed solvent phase and those in the pure solvents, and this relation gives an excellent fit for the aliphatic solutes with a consistent value of the DNP–TNT interaction parameter. The relation is less satisfactory for the results with the aromatic solutes and the model is modified to allow for the possible formation of charge transfer complexes between TNT and the aromatic solutes. A quantitative treatment is then shown to be possible only by using the approximations of solubility parameter theory.