Solid-liquid equilibria in n-alkanol+n-alkane systems. Prediction by several group-contribution theories

WE. Solubility of biphenyl in organic nonelectrolyte solvents. Comparison of observed versus predicted values based upon Mobile Order theory

Experimental solubilities are reported at 25.0°C for biphenyl dissolved in 26 different alkane, dialkyl ether, and alcohol solvents. Results of these measurements, combined with previously published biphenyl solubility data, are used to test the applications and limitations of expressions derived from Mobile Order theory. For the 40 solvents for which predictions could be made computations show that Mobile Order theory does provide fairly reasonable estimates of the saturation mole fraction solubilities. Average absolute deviation between predicted and observed values is 13.0%.Key words: biphenyl solubilities, organic nonelectrolyte solvents, solubility predictions.

Article

The volume fraction solubilities of a number of solid n-fatty alcohols and sterols are predicted in neat organic nonpolar, polar, and hydrogen-bonded solvents including water. In the frame of the mobile order thermodynamics, the predictions are based on the knowledge (a) of the melting properties of the alcohols, which affect the fluidization process, (b) of their molar size, which mainly rules the exchange entropy and the hydrophobic effect, and (c) of the group interaction stability constants, which are responsible for the balance between the competing self-association and strong intermolecular interactions of the alcohols in solution. Owing to its ability to deal properly with these various elementary processes, the proposed thermodynamic solubility model derived from the mobile order theory in H-bonded liquids represents an advance towards reliable and comprehensive estimates of the solubilizing capacity of common solvents for nonideal complexing systems, i.e., the solid alcohols.Key words: solubility prediction, solution thermodynamics, mobile order theory, n-fatty alcohols, sterols.