Polyethylene glycol (1500 or 600) – potassium tartrate aqueous two-phase systems

González-Amado, Marlen; Rodil, Eva; Arce, Alberto; Soto, Ana; Rodrı́guez, Oscar

doi:10.1016/j.fluid.2017.11.009

Cited by 9 publications

(10 citation statements)

References 26 publications

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“…Different electrolytes have been used in the literature to obtain ATPS composed of macromolecules, such as sulfates, 17−21 phosphates, 22,23 citrates, 24,25 thiocyanates, 26 and tartrates. 23,25,27,28 However, as far as we know, liquid−liquid equilibrium data made up of ammonium thiosulfate are not related in the literature. Two studies reporting the use of sodium thiosulfate to obtain ATPS with PEO with a molar mass of 1500, 4000, or 6000 g mol −1 .…”

Section: Introductionmentioning

confidence: 99%

“…The acquisition of liquid–liquid equilibrium data for new green ATPS with greater hydrophobicity, investigating the effect of the hydrophobic/hydrophilic balance of the macromolecule on the formation of the systems, can assist in elucidating the mechanisms that lead to their formation to expand the potential applications in the field of separation/purification. Different electrolytes have been used in the literature to obtain ATPS composed of macromolecules, such as sulfates, − phosphates, , citrates, , thiocyanates, and tartrates. ,,, However, as far as we know, liquid–liquid equilibrium data made up of ammonium thiosulfate are not related in the literature. Two studies reporting the use of sodium thiosulfate to obtain ATPS with PEO with a molar mass of 1500, 4000, or 6000 g mol –1 . , The use of ammonium thiosulfate ((NH 4 ) 2 S 2 O 3 ) as the electrolyte is an excellent strategy for the separation of analytes, mainly metal ions, because, compared to many other salts, it is inexpensive and nontoxic and has reducing and complexing characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Liquid–Liquid Equilibrium Data of Macromolecule + Ammonium Thiosulfate + Water Ternary Systems at 283.2, 298.2, and 313.2 K

et al. 2021

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Liquid−liquid equilibrium data were obtained for aqueous two-phase system (ATPS) composed of [poly(ethylene oxide) (PEO1500), poly(propylene oxide) (PPO425), poly(ethylene oxide) 11 −poly(propylene oxide) 17 −poly(ethylene oxide) 11 (L35), or poly(propylene oxide) 8 −poly(ethylene oxide) 22 −poly(propylene oxide) 8 (10R5)] + ammonium thiosulfate + water, at 283.2, 298.2, and 313.2 K. The consistencies of the all tie-line experimental compositions were improved by applying the Othmer− Tobias and Bancroft equations, resulting in linear correlation coefficients (R 2 ) ≥ 0.95. For all the ATPS, an increase in the temperature resulted in increases in the biphasic region and the tie-line slope, indicating that the phase separation process was entropically driven. Among the macromolecules studied, PPO425 produced the largest biphasic region, due to its greater hydrophobicity, followed by L35 ≈ 10R5 > PEO1500.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Liquid–Liquid Equilibrium Data of Macromolecule + Ammonium Thiosulfate + Water Ternary Systems at 283.2, 298.2, and 313.2 K

et al. 2021

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“…De los antecedentes y evaluaciones desarrolladas, podemos indicar que el pH de la solución influye directamente para la predominancia de una de las tres especies H2A, HAó A 2a partir del ácido tartárico, bitartrato de potasio, bitartrato de sodio o sal de Rochelle, además en un medio alcalino la solubilidad del tartrato se ve favorecida alcanzando concentraciones mayores a 10%, que en condiciones normales alcanza una solubilidad promedio de 0.5% (González et al, 2017).…”

Section: Resultados Y Discusiónunclassified

Recuperación De Cobre a Partir De La Malaquita Utilizando Soluciones De Tartrato Mediante Proceso De Lixiviación, Puno 2017

Gutierrez

2022

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El presente trabajo de investigación señala que la industria minera beneficia minerales oxidados de cobre como malaquita utilizando ácido sulfúrico, siendo la tendencia actual buscar reactivos alternativos menos agresivos con el medio ambiente, por lo que se propone como objetivos evaluar la influencia de soluciones de tartrato en la recuperación de cobre a partir de la malaquita en comparación al ácido sulfúrico. Como metodología se consideró 1170 g de mineral -3/8” en columnas de PVC de 4” de diámetro para cada prueba y como variables independientes tasa de riego, tiempo y concentración de tartrato según diseño experimental; las muestras fueron analizadas por espectrometría ultravioleta visible aplicando la ecuación de Beer-Lambert: A= ℇlC y absorción atómica. Los resultados indican recuperaciones de 1.039 g de cobre por litro de solución en 5 días de proceso, 26.3% del total recuperado, y 2.909 g/l en 32 días, 73.7% del total recuperado, alcanzando 3.948 g/l en 37 días de proceso, mientras que el proceso con ácido sulfúrico respondió favorablemente en los primeros días alcanzando recuperaciones de 4.2 g/l en 5 días de proceso, 65.6% del total recuperado, disminuyendo la velocidad de extracción con el tiempo a 2.2 g/l en 32 días, 34.4% del total recuperado, lo que concuerda con lo mencionado por (Bingöl y Canbazoǧlu, 2004) y (Nicol, 2018), alcanzando 6.4 g/l de Cu2+ en 37 días; como conclusión la solución de tartrato además de ser una especie biodegradable y amigable con el medio ambiente se presenta como una nueva alternativa tecnológica para el procesamiento de cobre con lixiviación selectiva.

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“…The same procedure was used to determine equilibrium compositions of mixtures lying in the LSh region. The solubility of the hydrated salt in water was determined in a previous publication 13 . To determine the solubility of the anhydrous salt in alcohol, the dehydration temperature for potassium tartrate was measured experimentally by Thermal Gravimetric Analysis using a TA Instruments model Q500.…”

Section: Experimental Methodsmentioning

confidence: 99%

Aqueous Two-Phase Systems: A Correlation Analysis

González-Amado

Rodrı́guez

Soto

et al. 2020

Ind. Eng. Chem. Res.

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Aqueous two-phase systems involve a limited region of a complicated phase diagram usually containing solid phases. Studies regarding these systems generally focus on the liquid-liquid region because it provides a suitable medium for liquid extraction of biomolecules and metal ions. In this work, the whole phase diagram was determined for ternary mixtures of water, dipotassium tartrate and ethanol or propanol at several temperatures and atmospheric pressure. In addition, density and refractive index of a diluted region of the mixtures were measured for compositional analysis of samples. Different regions were found involving solid and liquid phases, or the anhydrous and hemi-hydrated salt. The correlation of equilibrium data within the different regions was carried out with the NRTL model. To that aim, some restrictions were required to ensure the miscibility of the binary subsystem with water and alcohol. Individual correlation at each temperature and simultaneous correlation of data at all temperatures led to adequate phase diagram representation and low deviations. In spite of the use of temperature dependent parameters, results were slightly worse in the latter case (around or below 1%). The LLE data alone were also correlated, obtaining similar deviations to those obtained considering all equilibrium data. In all cases deviations found with propanol are higher (in the range of 3-4%) due to the proximity of the LLE region to the miscible water + propanol binary subsystem. The correlation of exclusively LLE data is

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Polyethylene glycol (1500 or 600) – potassium tartrate aqueous two-phase systems

Cited by 9 publications

References 26 publications

Liquid–Liquid Equilibrium Data of Macromolecule + Ammonium Thiosulfate + Water Ternary Systems at 283.2, 298.2, and 313.2 K

Liquid–Liquid Equilibrium Data of Macromolecule + Ammonium Thiosulfate + Water Ternary Systems at 283.2, 298.2, and 313.2 K

Recuperación De Cobre a Partir De La Malaquita Utilizando Soluciones De Tartrato Mediante Proceso De Lixiviación, Puno 2017

Aqueous Two-Phase Systems: A Correlation Analysis

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