Determination and correlation of liquid–liquid equilibria for four binary N,N-dimethylformamide+hydrocarbon systems

Matsuda, Hiroyuki; Taniguchi, Daisuke; Hashimoto, Junichi; Kurihara, Kiyofumi; Ochi, Kenji; Kojima, K.

doi:10.1016/j.fluid.2007.03.010

Cited by 21 publications

(13 citation statements)

References 30 publications

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“…The phase diagram of the inferred system is the Treybal I type, which the binary subsystem of 1-hexene + furfural, 1-hexene + DMF, and 1-hexene + n -hexane are mutually soluble system and n -hexane + furfural and n -hexane + DMF are partially miscible systems. The Figure show the binary solubility between n -hexane and furfural, − n -hexane and DMF , at various temperatures and literature data, the binary solubility obtained in the experiment is consistent with the literature data, and different measurement methods may cause some deviations. In addition, the experimental results explained that the miscibility of the solvent (furfural and DMF) in n -hexane increases with temperature growing.…”

Section: Resultssupporting

confidence: 80%

Liquid–Liquid Equilibria for Ternary Systems n-Hexane + 1-Hexene + Furfural (or N,N-Dimethylformamide) at 298.2, 308.2, and 318.2 K

et al. 2019

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The liquid–liquid equilibrium (LLE) data of ternary systems n-hexane + 1-hexene + solvents (furfural and N,N-dimethylformamide) were determined experimentally at 298.2, 308.2, and 318.2 K under 101.3 kPa. The solvents’ extraction capacity was assessed by the solute distribution coefficient and selectivity. Othmer-Tobias and Hand equations were used to correlate the measured data to test the correlation of the experimental data, which the linear correlation is (R 2) ≥ 0.99. Experimental LLE data was correlated utilizing the NRTL and UNIQUAC thermodynamic models with all of the RMSD and AARD values below 0.01 meaning that each ternary system satisfactory agreement at temperatures studied and the NRTL model gives a better agreement than the UNIQUAC model for ternary systems.

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Section: Resultssupporting

confidence: 80%

Liquid–Liquid Equilibria for Ternary Systems n-Hexane + 1-Hexene + Furfural (or N,N-Dimethylformamide) at 298.2, 308.2, and 318.2 K

et al. 2019

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“…Subsequently, the same binary interaction parameters were used in a fully transferable manner to predict the LLE behavior of DMF and NMP with n ‐hexane, n ‐heptane, and n ‐octane, as provided in Figure 8a,b. It can be noted that the calculated LLE behavior of the examined mixtures with DMF, 88,89 and NMP, 90‐92 are in good agreement with experimental data, in particular at temperatures away from the upper critical region of the binary mixtures.…”

Section: Resultssupporting

confidence: 79%

“…Still, the liquid-liquid demixing region occurred for high n-alkane concentrations; however, the depth of the region was suppressed as much as possible through approximating the right combination of dipolar, dispersive, and induced-dipole interactions, which is an expected limitation of the current model, without explicitly accounting for induced dipole interactions.Subsequently, the same binary interaction parameters were used in a fully transferable manner to predict the LLE behavior of DMF and NMP with n-hexane, n-heptane, and n-octane, as provided inFigure 8a,b. It can be noted that the calculated LLE behavior of the examined mixtures with DMF,88,89 and NMP,[90][91][92] are in good agreement with experimental data, in particular at temperatures away from the upper critical region of the binary mixtures. At lower temperature, the predictions from the models are more accurate for the dipolar fluid rich liquid phase, while overestimating the behavior for n-alkanes rich liquid phase, within 5% relative deviation from the experimental data.…”

supporting

confidence: 79%

“…LLE at atmospheric pressure, P = 0.1013 MPa, of binary mixtures of n ‐alkanes, n ‐hexane (□), n ‐heptane (∆), and n ‐octane (×) with strong dipolar fluids (a) DMF ( ξ = 1.010), and (b) NMP ( ξ = 1.015). Polar soft‐SAFT calculations (solid lines) compared to experimental data 88‐92 (symbols) [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

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Quantifying the effect of polarity on the behavior of mixtures of n‐alkanes with dipolar solvents using polar soft‐statistical associating fluid theory (Polar soft‐SAFT)

Alkhatib

Vega

2020

AIChE Journal

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We present results concerning the phase equilibria and excess properties of binary mixtures of n-alkanes with a range of fluids from low to high dipolar strength, namely 1-hexene, chloroform, dichloromethane, tetrahydrofuran, acetone, dimethylformamide, and N-methyl pyrrolidone modeled by polar soft-statistical associating fluid theory. Polar interactions are considered through the theory of Gubbins and Twu, extended to chainlike fluids by Jog and Chapman, and a priori fixing the polar parameters of the pure fluids, instead of fitting to experimental data. The equation provides accurate predictions for low to moderate dipolar molecules with n-alkanes, while the induced dipoles created by very strong dipolar fluids (μ ≥ 3.5 D), is implicitly considered by the appropriate selection of pure component parameters and a binary parameter which can be transferred to predict other properties. The equation is used to systematically study the effect of asymmetrical energy scales between polar and nonpolar fluids on vapor-liquid equilibria and excess properties.

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“…We found a common solvent used for the preparation of polymer membranes, N,N-dimethylformamide (DMF), which can form UCST systems with alkanes. 27 Luckily, most of the normal polymers are not soluble in alkanes. Hence, in this study, we used DMF and octane as the prototype mixed solvent system.…”

Section: ■ Introductionmentioning

confidence: 99%

Preparation of Highly Porous Polymer Membranes with Hierarchical Porous Structures via Spinodal Decomposition of Mixed Solvents with UCST Phase Behavior

Thankamony

Fan

et al. 2018

ACS Appl. Mater. Interfaces

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The predominant method to prepare polymer membranes is based on phase inversion. However, this method always leads to a dense skin with low porosity when normal polymers are used. Using the self-assembly of certain block copolymers, it is possible to prepare uniform pores with high porosity, but the prices of these polymers are too high to be afforded in practical applications. Here, we report a novel strategy to prepare highly porous and asymmetric polymer membranes using the widely used poly(vinylidene fluoride) (PVDF) as a prototype. The method combines spinodal decomposition with phase inversion utilizing mixed solvents that have the unique upper critical solution temperature phase behavior. The spinodal decomposition generates a thin surface layer containing a high density of relatively uniform pores in the mesoporous range, and the phase inversion generates a thick bulk layer composed of macrovoids; the two types of structures are interconnected, yielding a highly permeable, selective, and mechanically strong porous membrane. The membranes show an order of magnitude higher water permeance than commercial membranes and efficient molecular sieving of macromolecules. Notably, our strategy provides a general toolbox to prepare highly porous membranes from normal polymers. By blending PVDF with cellulose acetate (CA), a highly porous PVDF/CA membrane was prepared and showed similarly high separation performance, but the higher hydrophilicity of CA improved the membrane flux in the presence of proteins.

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Determination and correlation of liquid–liquid equilibria for four binary N,N-dimethylformamide+hydrocarbon systems

Cited by 21 publications

References 30 publications

Liquid–Liquid Equilibria for Ternary Systems n-Hexane + 1-Hexene + Furfural (or N,N-Dimethylformamide) at 298.2, 308.2, and 318.2 K

Liquid–Liquid Equilibria for Ternary Systems n-Hexane + 1-Hexene + Furfural (or N,N-Dimethylformamide) at 298.2, 308.2, and 318.2 K

Quantifying the effect of polarity on the behavior of mixtures of n‐alkanes with dipolar solvents using polar soft‐statistical associating fluid theory (Polar soft‐SAFT)

Preparation of Highly Porous Polymer Membranes with Hierarchical Porous Structures via Spinodal Decomposition of Mixed Solvents with UCST Phase Behavior

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