SOME NUMERICAL ANALYSES ON THE SOLUBILITY OF VANILLIN IN CARBITOL® + WATER SOLVENT MIXTURES
Algunos análisis numéricos sobre la solubilidad de la vainillina en mezclas cosolventes Carbitol® + agua
DOI:
https://doi.org/10.15446/rev.colomb.quim.v44n2.55218Palabras clave:
Vanillin, Carbitol® water mixtures, Jouyban-Acree model, preferential solvation, IKBI (en)vainillina, mezclas Carbitol® agua, modelo Jouyban-Acree, solvatación preferencial, IKBI (es)
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In this communication some reported solubility values of vanillin (component 3) in 2-(2-ethoxyethoxy)ethanol (Carbitol®, component 1) + water (component 2) mixtures at five temperatures from 298.15 to 318.15 K were correlated with the Jouyban-Acree model combined with van’t Hoff or Apelblat equations, obtaining models in second degree regarding the mixtures compositions. Mean percentage deviations were near to 6.0%. On the other hand, by means of the inverse Kirkwood-Buff integrals it was demonstrated that vanillin is preferentially solvated by water in water-rich mixtures (with a minimum δx1,3 value in the mixture x1 = 0.05, i.e. –4.29 x 10–2) but preferentially solvated by the cosolvent in mixtures with compositions 0.12 < x1 < 1.00 (with a maximum δx1,3 value equal to 3.61 x 10–2 in the mixture x1 = 0.25). It is conjectural that hydrophobic hydration plays a relevant role in the first case, whereas, in the second case, vanillin would be acting as Lewis acid with Carbitol®.
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