| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 215346 | The Journal of Chemical Thermodynamics | 2014 | 6 Pages |
•The phase equilibria of the system (water + 1-butanol + p-xylene) have been studied.•Isothermal (liquid + liquid) equilibrium data at T = 313.15 K was determined.•Isobaric (vapor + liquid + liquid) equilibrium data at 101.3 kPa was determined, too.•A heterogeneous ternary azeotrope, not previously referenced, has been found.•All experimental data have been correlated with thermodynamic models.
The (vapor + liquid), (liquid + liquid) and (vapor + liquid + liquid) equilibria of the ternary system (water + 1-butanol + p-xylene) have been determined. (Water + 1-butanol + p-xylene) is a type 2 heterogeneous ternary system with partially miscible (water + 1-butanol) and (water + p-xylene) pairs. By contrast, (1-butanol + p-xylene) is totally miscible under atmospheric conditions. This paper examines the (vapor + liquid) equilibrium in both heterogeneous and homogeneous regions at 101.3 kPa of pressure. (Liquid + liquid) equilibrium data at T = 313.15 K have also been determined, and for comparison, the obtained experimental data have been calculated by means of several thermodynamic models: UNIQUAC, UNIFAC and NRTL. Some discrepancies were found between the (vapor + liquid + liquid) correlations; however, the models reproduced the (liquid + liquid) equilibrium data well. The obtained data reveal a ternary heterogeneous azeotrope with mole fraction composition: 0.686 water, 0.146 1-butanol and 0.168 p-xylene.
