Measurement and Development of Solubility Correlations for Tritolylamine in Twelve Organic Solvents

The solubility of tritolylamine (TTA) in 12 solvents (hexane, heptane, n-octane, decane, hexadecane, toluene, benzene, 2-propanol, propanol, 2-butanone, methanol, and ethanol) was measured gravimetrically and compared with the predictions obtained from the ideal solution and UNIQUAC equations. To use the UNIQUAC equation, the specific heat and heat of fusion of TTA were measured by differential scanning calorimetry (DSC). DSC results also indicated that TTA does not have any enantiotropically related polymorphs. It is shown that the UNIQUAC predictions are close to the measured solubility values. In addition, measurement of the solubility of TTA in hexane was performed by an on-line density meter. The results compared closely with those obtained with the gravimetric method. The solvents were chosen so that their polarity indexes cover a wide range.