Contribution of different chemical groups to the driving forces for the partition of phenylmethane dyes in the PEO1500 + MgSO4 + H2O aqueous two-phase system

Castrillon, Elkin Dario C.; Coelho, Yara Luíza; Agudelo, Álvaro Javier Patiño; Marques, Isabela Araujo; Hudson, Eliara Acipreste; Pires, Ana Clarissa dos Santos; Silva, Luís Henrique Mendes da

doi:10.1016/j.fluid.2019.112451

Cited by 6 publications

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using an aqueous two-phase system (ATPS), a well-known and highly affordable liquid–liquid extraction technique, can be an impressive method for the extraction and purification of biomolecules − and separation of metal ions, − dyes, − and pharmaceutical compounds. − Besides, it is a simple and low-cost biocompatible extraction method that is efficient for many biological and environmental treatment industries and can be easily scaled up. − Recently, poly(vinyl pyrrolidone) (PVP) has been successfully applied to construct a polymer-salt-based ATPS with many organic and inorganic salts. ,,− It is a water-soluble polymer, inexpensive, and stable and has more features like poly(ethylene glycol) used in biomolecule purification. ,,, Although the PVP is getting the interest of many researchers, a few experimental data were found for the liquid–liquid equilibrium (LLE) data and physical properties of the aqueous mixture of PVP + salt systems.…”

Section: Introductionmentioning

confidence: 99%

Temperature, Polymer Molecular Weight, and Salt Effects on Phase Equilibria of PVP + Formate Salts + Water: Experimental Measurements, Correlations, and Thermodynamic Modeling

2021

View full text Add to dashboard Cite

The phase diagram and liquid−liquid equilibrium data for poly(vinyl pyrrolidone) (PVP) of different molecular weights (10,000, 24,000, or 40,000) + potassium formate (KCHO 2 ) or sodium formate (NaCHO 2 ) aqueous two-phase systems were determined experimentally at different temperatures (298.15, 308.15, and 318.15 K). The phase composition and the tie-line ends were obtained by measuring and correlating the density (ρ) and refractive index (n D ) of binary and ternary mixtures within the range of 0−46.6 wt % of PVP and 0−30 wt % of used salts. Furthermore, the binodal data were fitted to both the Pirdashti and Merchuk equations. The cloud point of PVP solutions was determined in the presence of salt at different concentrations. Additionally, the influence of the polymer's molecular weight and temperature on the binodal curve, tie-line length, and slope of tie-line is discussed and compared with the literature data. Moreover, the impact of the Hofmeister series on the separation factor of formate ion was determined. Finally, the extended NRTL and modified UNIFAC-NRF were used to compute the phase compositions of the studied systems, and the adjusted parameters of the models were reported. Results show that both models provide satisfactory agreement with experimental data.

show abstract