کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
202093 | 460586 | 2011 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Solubility of elemental sulfur in pure organic solvents and organic solvent–ionic liquid mixtures from 293.15 to 353.15 K Solubility of elemental sulfur in pure organic solvents and organic solvent–ionic liquid mixtures from 293.15 to 353.15 K](/preview/png/202093.png)
The solubility of elemental sulfur in pure aromatic and aliphatic hydrocarbons was measured by cloud-point measurements using the laser beam scattering method under atmospheric pressure and temperature ranging from 293.15 to 353.15 K. It was found that the solubility of elemental sulfur in the examined solvents increases with an increase in temperature. Among the solvents tested, sulfur had the highest solubility in toluene. The individual effect of four different imidazolium ionic liquids – 1-butyl-3-methylimidazolium hexafluorophosphate ([C4mim][PF6]), 1-hexyl-3-methylimidazolium hexafluorophosphate ([C6mim][PF6]), 1-butyl-3-methylimidazolium tetrafluoroborate ([C4mim][BF4]), and 1-hexyl-3-methylimidazolium tetrafluoroborate ([C6mim][BF4]) on the solubility of sulfur in toluene was also studied. The results show that both the structures of the cations and concentrations of ionic liquids used to play important roles in the solubility of elemental sulfur. The experimental solubility data of elemental sulfur can be well correlated by the modified Apelblat equation. Finally, the free energies of transfer, ΔtrG, entropies of transfer, ΔtrS, and enthalpies of transfer, ΔtrH, of elemental sulfur from toluene to toluene + [C6mim][PF6] mixture were determined based on the solubility measurements.
► Solubilities of sulfur in the mixed solvents containing the organic substance and ionic liquid were measured in details.
► The modified empirical Apelblat equation was employed to well correlate the experimental solubility data of sulfur.
► From the point of view of thermodynamics, the free energies, entropies, enthalpies of transfer were calculated to explore solubility behavior of sulfur.
Journal: Fluid Phase Equilibria - Volume 312, 25 December 2011, Pages 31–36