Liquid-liquid equilibrium of the ternary ammonium salt + poly(propylene glycol) + water system

Quintão, Juan C.; Patrício, Pamela R.; Veloso, Anne C.G.; Carvalho, Raquel Moreira Maduro de; Silva, Luís Henrique Mendes da; Silva, Maria do Carmo Hespanhol da

doi:10.1016/j.fluid.2017.03.018

Cited by 13 publications

(9 citation statements)

References 29 publications

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“…Normally, the top phase of the ATPS is rich in macromolecule and poor in salt, while the bottom phase is salt rich and poor in macromolecule. ,,,,,,− However, one new ATPS reported in this work, formed with (F68 or L64) + NH4SCN + water, showed phase inversion. In the new ATPS the top phase is rich in salt and the bottom phase is rich in macromolecule.…”

Section: Resultsmentioning

confidence: 70%

“…These values decrease slightly with increasing TLL for all ATPS. This occurs because the concentration of salt in the SRP increases markedly with increasing TLL, thereby augmenting the denominator of eq . Furthermore, the term C S SRP in the denominator is always higher than C S MRP , and therefore their difference is always negative in the denominator.…”

Section: Resultsmentioning

confidence: 99%

“…To minimize the Gibbs free energy, the system separates in two phases. Therefore, phase separation will be favored with lower amounts of the system components when the hydrophobicity of the macromolecule increases . Besides, the increase in the molar mass of the macromolecule (the molar masses of L64 and F68 are higher than that of PEO1500) implies a lower mixing entropy due to the lower number of possible spacial distributions of macromolecules in the solution, thereby favoring phase separation.…”

Section: Resultsmentioning

confidence: 99%

“…ATPS can be formed by mixing different aqueous solutions which contain macromolecule–macromolecule, salt–macromolecule, − macromolecule–ionic liquid and salt–ionic liquid, under specific conditions of temperature, pressure, and concentration. The final system shows two phases, each of which is enriched with one of the components and both being mostly formed by water.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Phase Diagrams, Densities, and Refractive Indexes of Aqueous Two-Phase Systems Comprising (F68, L64, or PEO1500) + (Ammonium, Sodium, or Potassium Thiocyanate Salts) + Water: Effect of Cation and Type of Macromolecule

Silva¹,

Silva²,

Fontoura³

et al. 2019

J. Chem. Eng. Data

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In extraction procedures, the more commonly used aqueous two-phase systems (ATPS) comprise mainly water, salt, and macromolecule, particularly the macromolecule poly(ethylene oxide) (PEO). However, one limitation of such ATPS is their capacity to separate compounds that are more hydrophobic. One possible solution to overcome this restriction is the use of ATPS formed with triblock copolymers, which are more hydrophobic and therefore enable the extraction of hydrophobic solutes. In addition, the range of applications of ATPS formed with thiocyanate salts can be broader, mainly to extract metal ions. In view of this, equilibrium data were acquired in this work by constructing phase diagrams for ATPS comprising macromolecules [poly(ethylene oxide), PEO, or (poly(ethylene oxide))-(poly(propylene oxide))-(poly(ethylene oxide)) triblock copolymers, F68 or L64] + thiocyanate salts (ammonium, sodium, or potassium) + water at 25.0 °C. The influence of the nature of the cation on the formation of the ATPS was investigated and followed the order K+ > Na+ > NH4 +. The capacity of different macromolecules to enable ATPS formation was also examined and followed the order L64 > F68 > PEO1500. Phase inversion occurred with the (L64 or F68) + NH4SCN + water ATPS, in that the top phase is rich in salt and the bottom phase is rich in macromolecule. This aspect is different in most ATPS that are typically described in the literature.

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Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phase Diagrams, Densities, and Refractive Indexes of Aqueous Two-Phase Systems Comprising (F68, L64, or PEO1500) + (Ammonium, Sodium, or Potassium Thiocyanate Salts) + Water: Effect of Cation and Type of Macromolecule

Silva¹,

Silva²,

Fontoura³

et al. 2019

J. Chem. Eng. Data

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“…The PEG-based ABSs are extensively reported in the literature as a suitable method of separation and purification of several compounds. ,− For some applications, the PPG presents some advantages concerning the more hydrophobic character, resulting from an additional methyl group per monomer, compared to PEG, being more suitable to separate or concentrate low hydrophilic compounds. − The interest in this polymer is due to the high hydrophobicity conferred to it, resulting in an additional methyl group per monomer, compared to PEG. This characteristic confers a more hydrophobic character to PPG than PEG, even in low molecular weights. , …”

Section: Resultsmentioning

confidence: 99%

Aqueous Biphasic Systems as a Suitable Route to Remove and Concentrate Parabens from Aqueous Media

Gonsalves

Farias

Mafra

et al. 2020

Ind. Eng. Chem. Res.

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Parabens are substances used as preservatives in cosmetics and food products, the extensive use of which results in their accumulation in the environment. In this work, aqueous biphasic systems (ABSs) were evaluated as a tool to separate and concentrate parabens (methyl-, ethyl-, propyl-, and butylparaben) from aqueous media. The liquid−liquid equilibrium experimental data of different ABSs composed of polymers [poly(ethylene)glycol, M w : 6000, 2000, and 400 g•mol −1 and poly(propylene)glycol (PPG), M w : 400 g•mol −1 ], salt [(NH 4 ) 2 SO 4 ], and water were obtained. The proposed systems were effective to partition the parabens to the polymer phase (extraction efficiencies up to 99.9%). Because of the higher hydrophobicity, PPG 400 promoted a higher paraben concentration with a lower polymer amount. Additionally, the evaluation of the phase volume ratio through the alpha parameter adjustment allows tuning the ABSs with the desired application, for example, concentration as a potential step in detecting these compounds.

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Aqueous two‐phase systems based on deep eutectic solvents and their application in green separation processes

Zhao

Pei

et al. 2019

J of Separation Science

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As a new environmentally friendly separation technology, deep eutectic solvent based aqueous two‐phase systems are extensively applied in various fields. Herein, we review recent advances in this field and highlight the possible directions of future developments. This article focuses on the effects of deep eutectic solvent and inorganic salts on the phase equilibrium, the microstructure of deep eutectic solvent based aqueous two‐phase systems, the applications of deep eutectic solvent based aqueous two‐phase systems in separation (proteins, biopolymers, saponins, and organic acids), and removal and recovery technologies for deep eutectic solvent from aqueous two‐phase systems.

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Liquid-liquid equilibrium of the ternary ammonium salt + poly(propylene glycol) + water system

Cited by 13 publications

References 29 publications

Phase Diagrams, Densities, and Refractive Indexes of Aqueous Two-Phase Systems Comprising (F68, L64, or PEO1500) + (Ammonium, Sodium, or Potassium Thiocyanate Salts) + Water: Effect of Cation and Type of Macromolecule

Phase Diagrams, Densities, and Refractive Indexes of Aqueous Two-Phase Systems Comprising (F68, L64, or PEO1500) + (Ammonium, Sodium, or Potassium Thiocyanate Salts) + Water: Effect of Cation and Type of Macromolecule

Aqueous Biphasic Systems as a Suitable Route to Remove and Concentrate Parabens from Aqueous Media

Aqueous two‐phase systems based on deep eutectic solvents and their application in green separation processes

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