Liquid–liquid equilibrium of water+acetic acid+butyl butanoate at 298K and 1 atmosphere

Sofiya, K.; Karunanithi, B.

doi:10.1016/j.fluid.2015.06.012

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…To ascertain the thermodynamic consistency of experimental LLE tie-line data, we used the well-known Othmer–Tobias equation. ,− The expression of this equation is given below: where w represents the mass fraction. While the superscripts I and II denote the organic-rich phase and aqueous-rich phase, respectively, the subscripts 1 and 3 are for 1,4-dioxane and [TMA][EPPS], respectively.…”

Section: Resultsmentioning

confidence: 99%

Application of Buffer-Based Ionic Liquid in the Separation of 1,4-Dioxane from Its Azeotropic Aqueous Solution

2018

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We have found that the ionic liquid (IL) [TMA][EPPS] could induce liquid−liquid phase splitting in the aqueous solution of 1,4-dioxane at ambient conditions. This IL is composed of tetramethylammonium (TMA) as a cation and a biological buffer, 4-(2-hydroxyethyl)-1-piperazinepropanesulfonic acid (EPPS), as an anion. The efficiency of this buffer-based IL for separating 1,4-dioxane from its aqueous solution has been evaluated on the basis of the liquid−liquid equilibrium (LLE) and solid−liquid−liquid equilibrium (SLLE) data of 1,4-dioane + water + [TMA][EPPS] at 298.15 K and under atmospheric pressure. The experimental LLE phase boundary data were correlated with an empirical equation and the effective excluded volume (EEV) model, respectively. The consistency of the LLE tie-line data was confirmed by using the Othmer−Tobias model. The binary interaction parameters of the NRTL model for each pair were obtained by correlating the experimental LLE and SLLE tie-line data. By using [TMA][EPPS] as an auxiliary agent, the maximum concentrations of 1,4-dioxane (97.8 wt %) in the organic-rich phase is greater than the azeotropic compositions (87.82 wt %) of the corresponding aqueous system. It clearly indicates that [TMA][EPPS] can be served as a high efficiency, noncorrosive, and biocompatible green agent for recovering high purity of 1,4-dioxane from its aqueous solution.

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Section: Resultsmentioning

confidence: 99%

Application of Buffer-Based Ionic Liquid in the Separation of 1,4-Dioxane from Its Azeotropic Aqueous Solution

2018

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“…Additionally, the chemical reactions using the acetic anhydride either as a reactant or as an extractant can discharge a significant amount of acetic acid in its aqueous streams. The two methods of manufacture of acetic acid are synthetic, and fermentation processes also have the dilute form of acetic acid in its outlet streams [1][2][3]. This waste stream should be treated to meet the environmental standard and recovered to add value to that industry [4].…”

Section: Introductionmentioning

confidence: 99%

“…This waste stream should be treated to meet the environmental standard and recovered to add value to that industry [4]. Several research methods were proposed to recover acetic acid in its dilute form [3]. The separation of acetic acid from its aqueous phase is difficult by distillation requires several plates.…”

Section: Introductionmentioning

confidence: 99%

Performance of PES Membrane Contactor on the Separation of Dilute Acetic Acid from Aqueous Forms

Sofiya¹,

Sivaraman²

2022

Int. J. Membrane Sci. Techno.

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The azeotropic characteristics of acetic acid between water make its separation from its aqueous phase essential. Many methods are studied for separating such a mixture. Solvent extraction using membrane contactors can increase the contact surface area. The dilute aqueous acetic acid extraction with the solvents petroleum ether and diisopropyl ether in a Poly Ether Sulfone (PES) hollow fiber membrane contactor was studied. The solvents and membrane extraction abilities are evaluated by exchanging the fluids on the shell and tube sides based on the distribution coefficients and total mass transfer coefficient at various flow rates. The findings show that when the solvent flow is increased, whether on the shell side or the tube side, the concentration of acetic acid increases in its solvent phase. As the shell side Reynolds number increased, it was noticed that the distribution coefficient value also increased. Both solvents' extraction ability was minimal, but diisopropyl ether gave better results when compared with the petroleum ether in terms of distribution coefficient. Three film resistance parameters in the series model have determined the overall mass transfer coefficient. The Reynolds number values showed that the mass transfer occurs in a laminar zone. Changes in the petroleum ether's Reynolds number on the tube side resulted in a maximum mass transfer coefficient of 11.41x10-6 m/s. Data on such hydrodynamics studies on membrane solvent extraction can help recover value-added material studies.

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“…Thus, the separation of these compounds from water has special economic importance. − Moreover, the precise information about phase behavior of the ternary systems including carboxylic acid is always needed for setting up the industrial units. Until now, a number of solvents, generally alcohols, − esters, − hydrocarbons, , and ketones , have been tested by different researchers for recovery of these compounds. However, liquid–liquid equilibrium (LLE) studies are still required for different purposes.…”

Section: Introductionmentioning

confidence: 99%

Liquid Phase Equilibria of Aqueous Mixtures of Carboxylic Acids (C₁–C₄) with Ethylbenzene: Thermodynamic and Mathematical Modeling

Saadat¹,

Gilani²,

Gilani³

et al. 2016

J. Chem. Eng. Data

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Liquid–liquid equilibrium (LLE) data were experimentally determined and correlated for the aqueous solutions of a series of carboxylic acids (i.e., formic, acetic, propionic, and butyric acids) with ethylbenzene at a temperature of 298.15 K and p = 101.32 kPa. The ternary mixtures containing of the acids exhibit type-1 LLE behavior. The quality of the observed tie-lines was checked using the Othmer–Tobias equation. The correlations were carried out using the thermodynamic and statistical modeling. The activity coefficient models of UNIQUAC and NRTL were applied to fit the tie lines and values of the binary interaction parameters between each pair of components were obtained. The correlation of the tie lines was also carried out by a GMDH type-NN, which are in agreement with those obtained experimentally. In this work, experimental distribution coefficients and separation factors were estimated. Moreover, the Kamlet–Taft LSER model was employed to correlate these quantities and was interpreted in terms of intermolecular interactions.

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Liquid–liquid equilibrium of water+acetic acid+butyl butanoate at 298K and 1 atmosphere

Cited by 7 publications

References 15 publications

Application of Buffer-Based Ionic Liquid in the Separation of 1,4-Dioxane from Its Azeotropic Aqueous Solution

Application of Buffer-Based Ionic Liquid in the Separation of 1,4-Dioxane from Its Azeotropic Aqueous Solution

Performance of PES Membrane Contactor on the Separation of Dilute Acetic Acid from Aqueous Forms

Liquid Phase Equilibria of Aqueous Mixtures of Carboxylic Acids (C₁–C₄) with Ethylbenzene: Thermodynamic and Mathematical Modeling

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Liquid–liquid equilibrium of water+acetic acid+butyl butanoate at 298K and 1 atmosphere

Cited by 7 publications

References 15 publications

Application of Buffer-Based Ionic Liquid in the Separation of 1,4-Dioxane from Its Azeotropic Aqueous Solution

Application of Buffer-Based Ionic Liquid in the Separation of 1,4-Dioxane from Its Azeotropic Aqueous Solution

Performance of PES Membrane Contactor on the Separation of Dilute Acetic Acid from Aqueous Forms

Liquid Phase Equilibria of Aqueous Mixtures of Carboxylic Acids (C1–C4) with Ethylbenzene: Thermodynamic and Mathematical Modeling

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Liquid Phase Equilibria of Aqueous Mixtures of Carboxylic Acids (C₁–C₄) with Ethylbenzene: Thermodynamic and Mathematical Modeling