Liquid-liquid equilibrium of novel aqueous two-phase systems and evaluation of salting-out abilities of salts

Abstract

Binodal data are beneficial to the design of aqueous two-phase extraction and the establishment of thermodynamic models. For the 2-propanol + Li 2 SO 4 /Na 2 SO 4 / (NH 4 ) 2 SO 4 /K 3 PO 4 + water systems and 1-propanol + K 3 PO 4 /K 3 C 6 H 5 O 7 /(NH 4 ) 3 C 6 H 5 O 7 + water systems, binodal data were determined at 298.15 K. The binodal data were correlated by a theoretical equation on the basis of statistical geometry. The salting-out abilities of salts and the phase-separation abilities of alcohols were evaluated by the effective excluded volume of salt and the binodal curves plotted in molality. A simple Hofmeister series of cations and anions were obtained. The organic salt, K 3 C 6 H 5 O 7 , shows as high a salting-out ability as K 3 PO 4 .

Development and Evaluation of Environmentally Benign Aqueous Two Phase Systems for the Recovery of Proteins from Tannery Waste Water

“…As a result, relatively a lesser concentration of sodium citrate is needed to form a two-phase system as compared to other salts. Recently, comparable results were obtained by Wang et al [39] and concluded that the EEV of Sodium sulfate > Ammonium sulfate and Potassium citrate > Ammonium citrate.…”

“…Effective excluded volume characterizes the acceptableness of a particular salt by the hydrophilic polymer, PEG with water as a solvent to form an ATPS. It has been cited in the literature that increase in EEV value, increases the salting-out ability of a salt [39]. Hence, herein we made an attempt to explain the binodal behavior with respect to EEV.…”

Liquid–liquid equilibria of hydrophilic alcohol+sodium hydroxide+water systems: Experimental and correlation

“…From Table 7, the EEV value of 1-propanol-NaOH system is larger than that of 2-propanolNaOH system at the same temperature, which indicates that the phase-forming strength of 1-propanol is stronger than 2-propanol. The acting force between alcohols themselves is in the order 1-propanol > 2-propanol > ethanol, which can explain the phaseforming abilities of the investigated hydrophilic alcohols [23].…”

Measurement and Correlation of Phase Diagram Data of Hydrophilic Alcohols (1-Propanol/2-Propanol) + Salts (Na2SO4/(NH4)2SO4/NH4NO3) + Water Systems

“…Liquid-liquid equilibria (LLE) are the key in improving the performance of an extraction process and understanding the phase behavior of systems exhibiting two liquid phases 12 . Only a few reports found in the literature focus on the study of ternary systems composed by 2-propanol +Na 2 SO 4 / (NH 4 ) 2 SO 4 + H 2 O systems [9][10] . Fig.…”

“…Based on our knowledge, there are only two works in the literature describing phase diagrams of ternary systems composed by 2-propanol+(NH 4 ) 2 SO 4 + +H 2 O 9 and 2-propanol+Na 2 SO 4 /(NH 4 ) 2 SO 4 +H 2 O 10 . None of these reports have conducted a systematic study on the phase-formation ability of the sulfate salts in hydrophilic alcohol + salt + water systems.…”