Liquid‐Liquid Equilibrium of Poly(Ethylene Glycol) 6000 + Sodium Succinate + Water System at Different Temperatures

Selvaraj, Raja; Murty, V. Ramachandra

doi:10.1155/2013/819259

Cited by 11 publications

(8 citation statements)

References 32 publications

(32 reference statements)

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“…This kind of trend can be explained by the kosmotropicity of sugars, in which water molecules are readily attracted by sucrose at a higher temperature and the sugaring-out effect is greatly pronounced. This is similar to the salting-out effect of salts on ATPS formation. − …”

Section: Resultssupporting

confidence: 66%

Liquid–Liquid Equilibrium of Primary and Secondary Aqueous Two-Phase Systems Composed of Sucrose + Triton X-114 + Water at Different Temperatures

Ramalakshmi¹,

Ramanan²,

Ariff

et al. 2014

J. Chem. Eng. Data

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Liquid−liquid equilibrium (LLE) data for aqueous twophase systems (ATPSs) composed of sucrose, Triton X-114, and water were determined at 288 K, 293 K, and 298 K. At 293 K and 298 K, the top and bottom phases of the ATPS were enriched with sucrose and Triton X-114, respectively. However, phase inversion was observed in the ATPS formed at a lower temperature (288 K). When the temperature increased, the area of the biphasic region became larger, whereas the slopes and the lengths of the tie lines decreased. Binodal data obtained at different temperatures were correlated using a fourthorder polynomial equation, while tie-line data were correlated using the Othmer−Tobias and Bancroft equations. Moreover, the Setschenow equation was used to investigate the sugaring-out effect of sucrose on the formation of the ATPS. The correlated results and fitting parameters from these empirical equations confirmed the reliability and reproducibility of the experimental results. Furthermore, both top-and bottom-phase solutions can be heated to 303 K to form the secondary ATPSs composed of sucrose and Triton X-114, respectively. The LLE data for secondary ATPSs are presented in this paper.

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Section: Resultssupporting

confidence: 66%

Liquid–Liquid Equilibrium of Primary and Secondary Aqueous Two-Phase Systems Composed of Sucrose + Triton X-114 + Water at Different Temperatures

Ramalakshmi¹,

Ramanan²,

Ariff

et al. 2014

J. Chem. Eng. Data

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“…It is apparent from these tables that the higher is the salt concentration in the bottom phase and the lower the PEG concentration is, and vice versa, the higher is the TLL. The TLL increases due to an increase in hydrophobicity of the phases . The TLL were obtained by a linear regression of each corresponding set of overall, top, and bottom phase composition.…”

Section: Resultsmentioning

confidence: 90%

Influence of Different Phase-Forming Parameters on the Phase Diagram of Several PEG–Salt Aqueous Two-Phase Systems

2014

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Different poly(ethylene glycol) (PEG) + potassium phosphate or sodium citrate aqueous two-phase systems (ATPS) were investigated at 23 °C, containing different PEG types (molecular weights 2000 g•mol −1 to 8000 g•mol −1 ) and pH values (5 to 9). Furthermore, the effect of the added salt NaCl (0 wt % to 8 wt %) on the PEG + potassium phosphate/sodium citrate ATPS was studied at 23 °C. The experimental binodal data were successfully correlated with the empirical nonlinear equation proposed by Hu. The effects of increasing molecular weight of PEG, pH, NaCl, and salt type on the obtained binodal curves were determined, resulting in a binodal curve shift toward the origin. Thus, an expansion of the two-phase region occurred by increasing molecular weight of the PEG, pH, and NaCl and due to the Gibbs free energy of hydration of ions of phosphate. Furthermore, the phase equilibrium compositions, tie-line lengths, slopes of tie-lines, critical points, and effective excluded volumes were obtained for all studied systems. Finally, the experimental tie-line compositions were successfully correlated by using the Othmer−Tobias and Bancroft equations, and linear dependency was confirmed.

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“…[22] has been used to extract GA, demonstrating excellent extraction performance. Recently, biodegradable organic salts are explored to form ATPS's to make this technology more environmentfriendly, including citrate, tartrate, formate and succinate etc [23][24][25][26]. There have been a large number of reports concerning ATPS's formed by those organic salts with PEG and their according phase diagrams.…”

Section: Introductionmentioning

confidence: 99%

Extraction of glycyrrhizic acid by aqueous two-phase system formed by PEG and two environmentally friendly organic acid salts - sodium citrate and sodium tartrate

Zhang

Wang

et al. 2019

Green Processing and Synthesis

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Two aqueous two-phase systems (ATPS’s) formed by using PEG and sodium citrate/sodium tartrate are applied and compared for extraction of glycyrrhizic acid (GA) from its stock solution. Their binodal curves and tie-lines are studied firstly. Influence of usage amount of the salt and the PEG on the partition coefficient and extraction efficiency is investigated. The highest extraction efficiency and partition coefficient achieved is 73% and 6.5, when the sodium citrate and PEG concentration is 15% and 20% respectively. It is also found that the ATPS based on sodium citrate is better than sodium tartrate for GA extraction. The present study indicates that ATPS formed by biodegradable organic acid salts could be feasible and environment-friendly technique for GA and other bioactive compounds.

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Liquid‐Liquid Equilibrium of Poly(Ethylene Glycol) 6000 + Sodium Succinate + Water System at Different Temperatures

Cited by 11 publications

References 32 publications

Liquid–Liquid Equilibrium of Primary and Secondary Aqueous Two-Phase Systems Composed of Sucrose + Triton X-114 + Water at Different Temperatures

Liquid–Liquid Equilibrium of Primary and Secondary Aqueous Two-Phase Systems Composed of Sucrose + Triton X-114 + Water at Different Temperatures

Influence of Different Phase-Forming Parameters on the Phase Diagram of Several PEG–Salt Aqueous Two-Phase Systems

Extraction of glycyrrhizic acid by aqueous two-phase system formed by PEG and two environmentally friendly organic acid salts - sodium citrate and sodium tartrate

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