Liquid–liquid equilibria of aqueous systems containing alcohol and ammonium sulfate

Feng, Ziyan; Li, Joshua Qingsong; Sun, Xiulan; Sun, Lanyi; Chen, Jinqing

doi:10.1016/j.fluid.2011.12.023

Cited by 22 publications

(27 citation statements)

References 25 publications

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“…A temperature increase did not lead to significant variations in either their shape or position, not interfering in the biphasic region (above the binodal curve) of the investigated systems. This observation is in accordance with the behavior observed by Guo et al (2012) and Feng et al (2012) for alcohol-salt ATPS.…”

Section: 1 Phase Diagrams Of Ethanol/ammonium Sulfate and Ethanol/sosupporting

confidence: 92%

Liquid-liquid equilibria in aqueous two-phase ethanol/salt systems at different temperatures and their application to anthocyanins extraction

et al. 2019

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Section: 1 Phase Diagrams Of Ethanol/ammonium Sulfate and Ethanol/sosupporting

confidence: 92%

Liquid-liquid equilibria in aqueous two-phase ethanol/salt systems at different temperatures and their application to anthocyanins extraction

et al. 2019

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“…It was seen that the concentration of water in the top phase decreases proportionally to the increase of the alcohol concentration in the same, causing the transfer of the water mass to the bottom phase. According to Feng et al ., there is a migration of the water mass from the top phase to the bottom where it will interact with the salt via the ion solvation process.…”

Section: Results and Discussonmentioning

confidence: 99%

Thermodynamics for curcumin (Curcuma longa L.) partitioning in the alcohol–salt aqueous two‐phase system

Batista

Gandolfi

Sampaio

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Curcumin is a polyphenol used as a natural colorant or spice with pharmacological properties including analgesic, anti-inflammatory, anticarcinogenic and antioxidant. In this work the partition of curcumin was carried out in an aqueous two-phase system (ATPS) under different conditions. RESULTS: Liquid-liquid equilibrium data for the ATPS composed of 2-propanol + sodium phosphate + water were determined experimentally by the turbidimetric method at temperatures T = 288.15, 293.15, 298.15 and 303.15 K and pH values 4.0 and 5.0. The phase-forming and salting-out capability of the mentioned salt were discussed by determination of the exclusion volume effect (EEV) and salting-out coefficient. The partition of curcumin was carried out. In order to investigate the driving forces that govern the curcumin partition we conducted a thermodynamic study by isothermal titration calorimetry (ITC). The Gibbs free energy transfer ( tr G), transfer enthalpy variation ( tr H) and transfer entropy variation (T tr S) were measured during the dye partition for the systems at 298.15 K.CONCLUSION: The increase in the pH value promoted an increase in the salting-out effect as well as in the exclusion volume value. It was observed that the dye had a strong tendency to transfer to the alcohol-rich top phase, showing K p high values (13.725-112.764). Thermodynamic analysis indicated that curcumin partition in the ATPS at 298.15 K was entropically driven to the top phase. The high values of theoretical recovery, selectivity and partition coefficient obtained in this study show that the investigated systems may be a promising alternative for curcumin pre-concentration and purification.

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“…The temperature can influence the phase‐forming and thus vary the two‐phase area by changing the solubility of salt and intermolecular forces between ethanol and water. It was reported that both the slope and the length of tie line were increased as the temperature increased . This was because the solubility of ammonium sulfate was increased and the intermolecular hydrogen bond was weakened.…”

Section: Resultsmentioning

confidence: 99%

Partition behavior of hydrophilic diols in an ethanol/ammonium sulfate salting‐out extraction system

Dai

Sun

et al. 2015

Engineering in Life Sciences

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It is important to investigate the partition behavior of hydrophilic alcohols at different process parameters in order to have a deep understanding of the salting-out extraction technique and to design suitable downstream processes. First, phase diagram data of ethanol/ammonium sulfate at 293.15 K were obtained, and the reliability of binodal curve and tie line data were proved by Merchuk, Othmer-Tobias, and Bancroft equations, respectively. Then, the partition behavior of five short-chain diols was studied. For different tie lines, the partition coefficient changed linearly with an increase in tie line length. The concentration of diols also had a significant effect on the partition behavior due to the similarity between diols and ethanol. Further, the effect of temperature was increased as the hydrophobicity of the diols increased, and the partition behavior of diols was correlated with their hydrophobicity, implying that the solutes with higher hydrophobicity could be extracted more effectively. These findings are useful for designing an economic and efficient salting-out extraction process for diverse products.

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Liquid–liquid equilibria of aqueous systems containing alcohol and ammonium sulfate

Cited by 22 publications

References 25 publications

Liquid-liquid equilibria in aqueous two-phase ethanol/salt systems at different temperatures and their application to anthocyanins extraction

Liquid-liquid equilibria in aqueous two-phase ethanol/salt systems at different temperatures and their application to anthocyanins extraction

Thermodynamics for curcumin (Curcuma longa L.) partitioning in the alcohol–salt aqueous two‐phase system

Partition behavior of hydrophilic diols in an ethanol/ammonium sulfate salting‐out extraction system

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