Measurement and correlation of liquid–liquid equilibria of the aqueous two-phase system polyvinylpyrrolidone–sodium dihydrogen phosphate

Zafarani-Moattar, Mohammed Taghi; Sadeghi, Rahmat

doi:10.1016/s0378-3812(02)00179-6

Cited by 112 publications

(96 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…data of several aqueous PEG + salt solutions at different PEG molar masses at 298.15 K. The evaluated parameters for studied systems are listed in Table 1. Also in Table 1, the evaluated parameters of the NRTL model (Zafarani-Moattar and Sadeghi, 2002) for studied systems have been listed. The same procedure has been used for the evaluation of model parameters for both models.…”

Section: Resultsmentioning

confidence: 99%

“…The Pitzer-Debye-Hückel model is used for long-range electrostatic interactions between ions and the modified segment-based NRTL equation is used for short-range interactions between all species. The major difference between this model and that of our previous paper (Zafarani-Moattar and Sadeghi, 2002), is in their reference Gibbs energies of local composition cells with a central ion. In the previous paper, (Zafarani-Moattar and Sadeghi, 2002) the pure completely dissociated electrolyte was used for the reference Gibbs energies of local composition cells with a central ion.…”

Section: Introductionmentioning

confidence: 88%

“…The major difference between this model and that of our previous paper (Zafarani-Moattar and Sadeghi, 2002), is in their reference Gibbs energies of local composition cells with a central ion. In the previous paper, (Zafarani-Moattar and Sadeghi, 2002) the pure completely dissociated electrolyte was used for the reference Gibbs energies of local composition cells with a central ion. However, in this work, a cell with random composition is used.…”

Section: Introductionmentioning

confidence: 88%

“…However, in this work, a cell with random composition is used. By this difference, the model presented in this work, produces better results than the previous model (Zafarani-Moattar and Sadeghi, 2002). The applicability of the proposed model is tested using experimental water activity data of some aqueous PEG or PPG + salt systems at different polymer molecular weights and the results are compared with those obtained from the NRTL model (Zafarani-Moattar and Sadeghi, 2002).…”

Section: Introductionmentioning

confidence: 95%

“…This model uses a combination of the Flory-Huggins expression for the entropy of mixing molecules of different size and the NRTL equation for weak local physical interactions between solvent and segments of polymer chains. Recently (Zafarani-Moattar and Sadeghi, 2002), the electrolyte NRTL model (Chen and Evans, 1986) was combined with the polymer NRTL model (Chen, 1993) to represent the excess Gibbs energy of aqueous polymer-electrolyte solutions.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A modified segment-based nonrandom two-liquid model for the calculation of vapor–liquid equilibrium of aqueous polymer–salt solutions

Sadeghi

2006

Chemical Engineering Science

Self Cite

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A modified segment-based nonrandom two-liquid model for the calculation of vapor–liquid equilibrium of aqueous polymer–salt solutions

Sadeghi

2006

Chemical Engineering Science

Self Cite

View full text Add to dashboard Cite

The role of ionic liquid [C₄C₁im]Br as an adjuvant on the two‐phase formation and the extraction of l‐phenylalanine in ABS composed of PEG400 and potassium citrate at different temperatures

Hamzehzadeh

Touri

2018

Biotechnology Progress

View full text Add to dashboard Cite

The potential of {polyethylene glycol 400 + potassium citrate} aqueous biphasic system (ABS) with ionic liquid (IL) 1-butyl-3-methylimidazolium bromide ([C C im]Br) as an adjuvant is examined for the extraction of l-phenylalanine (Phe), as a model biomolecule, at different temperatures and system compositions. The binodal curves and liquid-liquid equilibrium data were determined by the addition of 5 wt% IL to investigate its effect on phase diagrams and Phe partition coefficients. The results indicate that binodal curves of systems with and without IL are more deviated from each other with decreasing temperature. Moreover, IL has a high tendency to partition into the PEG-rich phase. This tendency increases with increasing temperature and system compositions. For Phe, the partition coefficients obtained in this work (K ≈ 5.5-81.2) are significantly higher than those observed in other conventional PEG-inorganic salt ABS (K ≈ 0.5-2.5), water-immiscible ILs two-phase extraction systems (K ≈ 0.02-1.2), or even, in the IL-based ABS with the same IL as the main phase-forming component (K ≈ 3.2). The phase hydrophobicity, salting-out and π⋯π stacking seem to be the main driving forces to affect the extraction aptitude of the studied ABS for Phe. Furthermore, the performance of using [C C im]Br as adjuvant to improve the partition of Phe in the studied ABS at different temperatures seems to be ruled by the differences in the phases hydrophobicities. Finally, the experimental tie lines and partition coefficients are accurately correlated using the NRTL model. © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 2018 © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 34:1149-1166, 2018.

show abstract

A new aqueous biphasic system containing polypropylene glycol and a water‐miscible ionic liquid

Zafarani-Moattar

Hamzehzadeh

Nasiri

2011

Biotechnology Progress

Self Cite

View full text Add to dashboard Cite

In this work, we proposed a novel aqueous biphasic system (ABS) composed of polypropylene glycol P400 (PPG P400) and hydrophilic ionic liquids (IL), 1-alkyl-3-methylimidazolium bromide (alkyl = ethyl or butyl), forming an upper polymer-rich phase and a lower IL-rich phase at ambient temperature. This new ABS can present interesting characteristics shared by ILs and polymers such as low volatility, good solvation ability, tunable physical properties, and high design capacity for achieving task-specific phase components to enhance the partitioning of target species. Ternary phase diagram of the novel ABS formed by PPG 400 and [C(2) mim]Br in water was measured at T = 298.15 K. Factors affecting the binodal curves such as the cation side alkyl chain length and the temperature were also evaluated. The results were successfully interpreted in terms of the kosmotropic/chaotropic nature of ILs. Furthermore, the phase behavior of the PPG-[C(2) mim]Br ABS is described by the NRTL model. Finally, the extraction potential of the proposed ABS was evaluated through its application to the extraction of the essential amino acids such as L-tryptophan and L-tyrosine. The partition coefficients here obtained demonstrated the fine potential of the proposed ABS for biomolecules separation.

show abstract

Measurement and correlation of liquid–liquid equilibria of the aqueous two-phase system polyvinylpyrrolidone–sodium dihydrogen phosphate

Cited by 112 publications

References 27 publications

A modified segment-based nonrandom two-liquid model for the calculation of vapor–liquid equilibrium of aqueous polymer–salt solutions

A modified segment-based nonrandom two-liquid model for the calculation of vapor–liquid equilibrium of aqueous polymer–salt solutions

The role of ionic liquid [C₄C₁im]Br as an adjuvant on the two‐phase formation and the extraction of l‐phenylalanine in ABS composed of PEG400 and potassium citrate at different temperatures

A new aqueous biphasic system containing polypropylene glycol and a water‐miscible ionic liquid

Contact Info

Product

Resources

About

Measurement and correlation of liquid–liquid equilibria of the aqueous two-phase system polyvinylpyrrolidone–sodium dihydrogen phosphate

Cited by 112 publications

References 27 publications

A modified segment-based nonrandom two-liquid model for the calculation of vapor–liquid equilibrium of aqueous polymer–salt solutions

A modified segment-based nonrandom two-liquid model for the calculation of vapor–liquid equilibrium of aqueous polymer–salt solutions

The role of ionic liquid [C4C1im]Br as an adjuvant on the two‐phase formation and the extraction of l‐phenylalanine in ABS composed of PEG400 and potassium citrate at different temperatures

A new aqueous biphasic system containing polypropylene glycol and a water‐miscible ionic liquid

Contact Info

Product

Resources

About

The role of ionic liquid [C₄C₁im]Br as an adjuvant on the two‐phase formation and the extraction of l‐phenylalanine in ABS composed of PEG400 and potassium citrate at different temperatures