scholarly journals Liquid-Liquid Equilibrium Data for the Ionic Liquid N-Ethyl-Pyridinium Bromide with Several Sodium Salts and Potassium Salts

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Yuliang Li ◽  
Xiaojia Lu ◽  
Jing Hao ◽  
Changquan Chen
Keyword(s):  
Correlation Coefficients ◽  
Liquid Equilibrium ◽  
Two Phase ◽  
Salting Out ◽  
Pyridinium Bromide ◽  
Equilibrium Data ◽  
Aqueous Two Phase Systems ◽  
Phase Systems ◽  
Lle Data ◽  
Tie Line

The liquid-liquid equilibrium (LLE) data for systems containing N-ethyl-pyridinium bromide ([EPy]Br), salt (Na2HPO4,K2HPO4,K2SO4,C4O6H4KNa), and water have been measured experimentally atT=298.15 K and the formations of these four aqueous two-phase systems (ATPSs) have been discussed. Also, the effective excluded volume (EEV) values obtained from the binodal models for the four systems were determined and the salting-out abilities of different salts follow the order ofK2SO4>K2HPO4>Na2HPO4>C4O6H4KNa. The solubility data were correlated by the Merchuk and other equations while the tie-line data by the Othmer-Tobias, Bancroft, two-parameter, and Setschenow-type equations. The correlation coefficients evidenced that experimental data fitted well to all these equations. These four salts were proved successfully to form ATPSs with N-ethyl-pyridinium bromide, making a significant contribution to the further study of this kind of ATPS.

Liquid−Liquid Equilibrium Data for Aqueous Two-Phase Systems Composed of Ethylene Oxide Propylene Oxide Copolymers

2011 ◽  
Vol 56 (2) ◽  
pp. 190-194 ◽  
Author(s):  
Kelany S. Nascimento ◽  
Sonia Yelo ◽  
Benildo S. Cavada ◽  
Ana M. Azevedo ◽  
Maria R. Aires-Barros
Keyword(s):  
Ethylene Oxide ◽  
Propylene Oxide ◽  
Liquid Equilibrium ◽  
Two Phase ◽  
Equilibrium Data ◽  
Aqueous Two Phase Systems ◽  
Phase Systems

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

2010 ◽  
Vol 8 (4) ◽  
pp. 886-891 ◽  
Author(s):  
Yun Wang ◽  
Jing Wang ◽  
Juan Han ◽  
Shiping Hu ◽  
Yongsheng Yan
Keyword(s):  
Water Systems ◽  
Organic Salt ◽  
Excluded Volume ◽  
Statistical Geometry ◽  
Liquid Equilibrium ◽  
Two Phase ◽  
Salting Out ◽  
Aqueous Two Phase Systems ◽  
Phase Systems ◽  
Aqueous Two Phase Extraction

AbstractBinodal data are beneficial to the design of aqueous two-phase extraction and the establishment of thermodynamic models. For the 2-propanol + Li2SO4/Na2SO4/ (NH4)2SO4/K3PO4 + water systems and 1-propanol + K3PO4/K3C6H5O7/(NH4)3C6H5O7 + 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, K3C6H5O7, shows as high a salting-out ability as K3PO4.

Liquid-Liquid Equilibria for Acetone + Several Citrates Aqueous Two-Phase Systems at Different Temperatures

2012 ◽  
Vol 549 ◽  
pp. 30-35
Author(s):  
Shi Ping Hu ◽  
Juan Han ◽  
Yong Sheng Yan ◽  
Yu Tao Hu
Keyword(s):  
Ternary Systems ◽  
Data Fitting ◽  
Potassium Citrate ◽  
Liquid Equilibrium ◽  
Two Phase ◽  
Different Temperatures ◽  
Tie Lines ◽  
Aqueous Two Phase Systems ◽  
Phase Systems ◽  
Tie Line

Liquid-liquid equilibria for the three kinds of the ternary systems acetone + ammonium, sodium or potassium citrate + water have been determined at T= (273.15, 283.15, and 298.15) K. Binodal curves, tie-lines, and integrated phase diagrams for the ternary systems are given. The data of the experimental bimodal curve are described with a four-parameter equation. The result also shows the temperature has little influence on the liquid-liquid equilibrium within the investigated range. The tie-line data calculated according to the bimodal data fitting equation and the lever arm rule were satisfactorily described by using the Othmer-Tobias and Bancroft equations, and the result conform the reliability of the calculation method and corresponding tie-line data.

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

2017 ◽  
Vol 450 ◽  
pp. 184-193 ◽  
Author(s):  
Juliana Gomes Pimentel ◽  
Silvana Ferreira Bicalho ◽  
Olga Reinert Ramos Gandolfi ◽  
Lizzy Ayra Alcântara Verissimo ◽  
Sérgio de Sousa Castro ◽  
...  
Keyword(s):  
Liquid Equilibrium ◽  
Two Phase ◽  
Salting Out ◽  
Different Temperatures ◽  
Aqueous Two Phase Systems ◽  
Phase Systems

scholarly journals Effects of the polymer molecular weight and type of cation on phase diagrams of polythylene glycol + sulfate salts aqueous two-phase systems

2019 ◽  
Vol 73 (6) ◽  
pp. 375-385
Author(s):  
Gholamhossein Parmoon ◽  
Abdorreza Nafchi ◽  
Mohsen Pirdashti
Keyword(s):  
Molecular Weight ◽  
Magnesium Sulfate ◽  
Phase Diagrams ◽  
Zinc Sulfate ◽  
Two Phase ◽  
Aluminium Sulfate ◽  
Aqueous Two Phase Systems ◽  
Phase Systems ◽  
Lle Data ◽  
Tie Line

Phase diagrams and liquid ? liquid equilibrium (LLE) data for aqueous two-phase systems (ATPSs) containing zinc sulfate, magnesium sulfate or aluminium sulfate and polyethylene glycols PEG 300, 400 and 600 have been determined at 298.15 K. It was attempted to show how the PEG molecular weight and the type of cation influence the binodal curve, tie line length (TLL) and slope of the tie line (STL). The results have shown that as the PEG molecular weight increases, the two-phase region becomes extended and the binodal curve shifts to the origin. The refractive index and density of ternary (PEG 300,400 and 600 + zinc sulfate/magnesium sulfate/aluminium sulfate + water) systems have been measured to achieve the phase composition and the tie lines. Finally, the effective excluded volume (EEV) model was applied to describe the salting-out ability of the systems. The LLE data from this research may be potentially used for recovering biological molecules like proteins.

scholarly journals The Research and Mechanism of Extracting Vitamin B6 Using Aqueous Two-Phase Systems

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Changyu Lu ◽  
Luning Gao ◽  
Aibing Chen ◽  
Duo Li ◽  
Yahong Zhou
Keyword(s):  
Isopropyl Alcohol ◽  
Type Equation ◽  
Separation And Purification ◽  
Liquid Equilibrium ◽  
Two Phase ◽  
Salting Out ◽  
Quaternary Systems ◽  
Tie Lines ◽  
Aqueous Two Phase Systems ◽  
Lle Data

The aim of this work is to investigate the quaternary systems which contain (polyethylene glycol/isopropyl alcohol) + ethanol + salt (Na2SO4/Na2CO3) + water to understand their liquid-liquid equilibrium (LLE) and salting-out ability and apply them to definite uses. For this purpose, phase diagrams and liquid-liquid equilibrium (LLE) data of the investigated quaternary systems were experimentally determined at 308.15, 318.15, and 328.15 K. Binodal curves were fitted to three empirical nonlinear equations, whereas tie-lines were fitted to the Setschenow-type equation and another two-parameter equation. All the models were successfully correlated with the experimental data. What is more, factors such as temperature, different organic solvent, and type of salt are studied. It was demonstrated that temperature has no influence in binodal curves and the salting-out ability follows the order Na2CO3 > Na2SO4. Finally, we chose the best system (isopropyl alcohol + ethanol + Na2CO3 + H2O) to find out the extraction efficiency when dealing with vitamin B6. The results show that when the temperature is 308.15 K and pH is 5.02, the extraction efficient can reach a top level. It serves as a theoretical basis for the extraction, separation, and purification.

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