Liquid-liquid phase equilibria of aqueous two-phase systems containing salts and polyethylene glycol

Application of aqueous two phase systems based on polyethylene glycol and sodium citrate for the recovery of phenolic compounds from Eucalyptus wood

“…The phase equilibrium for an aqueous two phase system is generally influenced by temperature (Voros et al 1993, Willauer et al 2000, Salic et al 2011. For PEG-sodium citrate ATPS, an increase in temperature causes an increase in the length of the tie line, and moreover an increase in the slope of the equilibrium tie lines (Murugesan and Perumalsamy 2005).…”

Thermodynamic modelling of phase equilibrium for water + poly(Ethylene glycol) + salt aqueous two-phase systems

“…With the procedure above, molecular interaction energy parameters were obtained, as shown in Table 1, fitting the experimental liquid-liquid equilibrium data at several temperatures, reported by Duarte et al (2000) for the water + PEG 4000 + potassium phosphate system; Snyder et al (1992) for the water + PEG 1000 + magnesium sulfate, water + PEG 3350 + magnesium sulfate, water + PEG 8000 + sodium sulfate, water + PEG 1000 + potassium phosphate and water + PEG 8000 + potassium phosphate systems; and Voros et al (1993) for the water + PEG 2000 + sodium carbonate system. With these estimated parameters, the experimental data of Duarte et al (2000), Snyder et al (1992) and Voros et al (1993) were correlated.…”

“…The experimental liquid-liquid equilibrium data at several temperatures, reported by Duarte et al (2000) for the water + PEG 4000 + potassium phosphate system; Snyder et al (1992) for the water + PEG 1000 + magnesium sulfate, water + PEG 3350 + magnesium sulfate, water + PEG 8000 + sodium sulfate, water + PEG 1000 + potassium phosphate and water + PEG 8000 + potassium phosphate systems; and Voros et al (1993) for the water + PEG 2000 + sodium carbonate system were used to estimate the molecular interaction and nonrandomness parameters of the NRTL model.…”

Influence of the temperature and type of salt on the phase equilibrium of peg 1500 + potassium phosphate and peg 1500 + sodium citrate aqueous two-phase systems

“…Polymer + salt ATPS are particularly useful, since they present relatively low cost and low viscosity, which provide an efficient phase separation [11][12][13][14][15][16] . Equilibrium data for aqueous systems formed by PEG + sodium citrate and particularly for those composed of PEG + potassium phosphate are quite available [17][18][19][20][21][22][23][24][25][26][27][28] . However, there is nowadays a considerable demand for comprehensive studies with reference to the effect of operational conditions on the behavior of ATPS 29 .…”