Experimental Measurements and Correlation of Liquid Extraction of o-Xylene from Octane Using Mixed Solvents Including Dimethyl Sulfoxide and Methanol at 298.15 K

  • Fadoua FarghiEmail author
  • Mohammed Kaddami


The purpose of the present work is to study the effect of adding different mass quantities of a light alcohol (methanol) to dimethyl sulfoxide, in order to extract o-xylene from octane. Experimental liquid–liquid equilibrium data for the quaternary systems {octane + o-xylene + dimethyl sulfoxide + (0.2, 0.4, 0.6, and 0.8) mass fraction of methanol} were determined at T = 298.15 K under atmospheric pressure. For the four quaternary systems, the selectivity and distribution coefficient of o-xylene were applied to assess the efficacy of (dimethyl sulfoxide + mass fraction of methanol) as mixed solvents. The triangular phase diagrams for all studied systems were sketched. The Non Random Two-Liquid activity coefficient model was employed to correlate experimental results and fitting parameters were reported.


Dimethyl sulfoxide Liquid–liquid equilibrium Methanol NRTL model Tetrahedral diagram 



The authors are grateful to the Analyses and Characterization Centre of Kadi AYYAD University, Marrakech-Morocco for their materiel facilities.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.


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Authors and Affiliations

  1. 1.Laboratory: Physical-Chemistry of Processes and Materials, Faculty of Sciences and TechnologiesHassan 1st UniversitySettatMorocco

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