| Abstract
| - This work reports the solid−liquid equilibria of several binary systems formed by solvent (1) + dibenzothiophene(2) and solvent (1) + dibenzothiophene sulfone (2). At least six experimental points were obtained to trace thesolid−liquid equilibrium curve, using the visual technique to determine the change of phase. The experimentaldata were obtained at atmospheric pressure and from a (280 to 353) K temperature range. The experimentaluncertainties were ± 0.0005 in mole fraction and ± 0.5 K in temperature, respectively. A classical equilibriumsolid−liquid equation was used to derive the activity coefficient from the solubility experimental data. The followingsolution models were employed to correlate the activity coefficient: UNIQUAC, Wilson, Tsuboka−Katayama−Wilson, van Laar, and Margules. A good agreement can be obtained between derived and correlated activitycoefficients for selected systems. Additionaly, the following thermophysical properties were obtained experimentallyfor the pure dibenzothiophene sulfone: enthalpy of fusion, melting temperature, and heat capacity for both solidand liquid phases. These values have not been previously reported in the open literature, and the correspondingentropy of fusion was derived from the experimental information. The systems studied in this work are of industrialimportance in the production of ultralow sulfur fuels.
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