Journal
JOURNAL OF CHEMICAL THERMODYNAMICS
Volume 39, Issue 2, Pages 297-303Publisher
ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jct.2006.06.014
Keywords
phenolic compounds; salt effect; solubility-temperature dependence; Van't Hoff plots; transfer thermodynamic properties
Categories
Ask authors/readers for more resources
Solubility-temperature dependence data for six phenolic compounds (PhC, contained in olive mill wastewater (OMWW), in water and in some chloride salts (KCl, NaCl, and LiCl) aqueous solutions have been presented and solution standard molar enthalpies (Delta H-sol(o)) were determined using Van't Hoff plots. The temperature was varied from 293.15 K to 318.15 K. Solubility data were estimated using a thermostated reactor and HPLC analysis. It has been observed that solubility, in pure water and in aqueous chloride solutions, increases with increasing temperature. The salting-out LiCl > NaCl > KCl order obtained at 298.15 K is confirmed. Results were interpreted in terms of the salt hydration shells and the ability of the solute to form hydrogen-bond with water. The standard molar Gibbs free energies of transfer of PhC (Delta(tr)G(o)) from pure water to aqueous solutions of the chloride salts have been calculated from the solubility data. In order to estimate the contribution of enthalpic and entropic terms, standard molar enthalpies (Delta H-tr(o)) and entropies (Delta S-tr(o)) of transfer have also been calculated. The decrease in Solubility is correlated to the positive Delta(tr)G(o) value which is mainly of enthalpic origin. (c) 2006 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available