Details

Autor(en) / Beteiligte

• Pimentel, Juliana Gomes
• Bicalho, Silvana Ferreira
• Gandolfi, Olga Reinert Ramos
• Verissimo, Lizzy Ayra Alcântara
• Castro, Sérgio de Sousa
• Souza, Erik Almeida
• Veloso, Cristiane Martins
• Fontan, Rafael da Costa Ilhéu
• Sampaio, Vanessa Santos
• Bonomo, Renata Cristina Ferreira

Titel

Evaluation of salting-out effect in the liquid–liquid equilibrium of aqueous two-phase systems composed of 2-propanol and Na2SO4/MgSO4 at different temperatures

Ist Teil von

• Fluid phase equilibria, 2017-10, Vol.450, p.184-193

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2017

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Liquid-liquid equilibrium data (LLE) were obtained for aqueous two-phase systems (ATPS) composed of 2-propanol + inorganic salt (Na2SO4 or MgSO4) + water, at different temperatures T = (293.15, 303.15, 313.15 e 323.15) K. The effect of temperature on the binodal curves and tie-lines was studied. Temperature increase resulted in an expansion of the biphasic region, and this effect was more pronounced in the systems composed of 2-propanol + Na2SO4. A nonlinear equation was used to describe the binodal curves in terms of the mass fraction of 2-propanol versus sulfate salt. The effects of the different salts (Na2SO4 or MgSO4) on the phase-separation abilities of the studied ATPS was discussed using the values of parameters in the effective excluded volume (EEV) model. The salting-out abilities of the investigated salts followed the order Na2SO4 >MgSO4. The experimental results of LLE were correlated using the UNIFAC model. Calculated RMS deviations between the experimental and predicted LLE compositions for the 2-propanol + Na2SO4 and 2-propanol + MgSO4 systems were 1.76 and 0.68%, respectively. The UNIFAC model was able to effectively represent the studied biphasic aqueous systems. •LLE data for ATPS salt + 2-propanol + water at 293.15–323.15 K were determined.•The salting-out effect in ATPS have been systematically studied.•The salting-out ability of the salts followed the order Na2SO4 > MgSO4.•Liquid-liquid equilibrium data were predicted using the UNIFAC model.•Results obtained from the UNIFAC model agree well with experimental values of LLE.