Liquid-liquid phase equilibrium for ternary systems hexamethyldisiloxane-acetic acid (propionic acid)-water

Radecki, Aleksander; Kaczmarek, Barbara; Grzybowski, Janusz

doi:10.1021/je60065a008

Cited by 18 publications

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“…A considerable number of authors have reported several liquid–liquid equilibrium (LLE) data on aqueous systems containing propionic acid and organic solvents. − The type of extraction solvent is one of the most important factors that strongly influence the equilibrium characteristics. A large number of organic solvents (mainly aliphatic or cyclo aliphatic) have been tested as extractants from different chemical categories, including alcohols, − esters, − ketones, − hydrocarbons, − ethers, , nitriles, , and others.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Liquid–Liquid Equilibria for Aqueous Systems of Propionic Acid with Structurally Similar Aryl Solvents

Gilani

Kashef

Khanghah

2020

Ind. Eng. Chem. Res.

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Liquid−liquid phase equilibria were comparatively studied for the aqueous mixtures of propionic acid with four structurally similar aryl compounds (2-phenylethanol, 1-phenylpropanol, propiophenone, and methyl benzoate) as a function of the mixture composition at T = 298.2 K and p = 0.1 MPa. The cloud point data were measured, and the corresponding solubility diagrams for the studied ternary systems were plotted. Tie lines were measured by the analysis of both the aqueous and organic phases. All of the ternary systems display the type-1 liquid−liquid equilibrium (LLE) behavior. The quality of tie lines was confirmed by the linear behavior of the Othmer−Tobias plot. The thermodynamic model of NRTL was successfully used to correlate the experimental tie lines, and the model binary interaction parameters were determined. Evaluation of the extracting ability of the aryl solvents was performed by the estimation of the solute distribution coefficients and selectivities. Finally, all of the studied aryl solvents are appropriate separating agents for aqueous propionic acid mixtures.

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Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Liquid–Liquid Equilibria for Aqueous Systems of Propionic Acid with Structurally Similar Aryl Solvents

Gilani

Kashef

Khanghah

2020

Ind. Eng. Chem. Res.

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“…This work provides a continuation of our studies on the liquid-liquid and liquid-vapor equilibria in binary and ternary systems comprising HMDS (8)(9)(10). These studies may reveal certain hitherto unknown features of HMDS associated with a specific structure of its molecule in which two trimethylsilyl groups are linked through an oxygen atom.…”

Section: Introductionmentioning

confidence: 74%

Infrared spectroscopic determination of the liquid-vapor equilibrium in the ternary system hexamethyldisiloxane-chloroform-carbon disulfide

Radecki¹,

Grzybowski²,

Halkiewicz³

1978

J. Chem. Eng. Data

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ml of 0.049 N NaOH Flgure 5. Titration of the aqueous phase after extraction with 0.17 N (2.2 wt %) tributylamine in chloroform.indicates an advantage for higher molecular weight amines. Along this line, the water-soluble base in TOPO solvent mixtures, noted in Experimental Procedure, should be explored and identified as TOPO itself, an impurity in the TOPO and/or a complex of TOPO and acetic acid.Formic Acid ws. Acetic Acid. Tables I X and X compare the extractions of formic acid and acetic acid with various phosphoryl and amine solvents. In all cases the formic acid is more ef-fectively extracted. The results for the amines agree with other authors (5, 6 ) , who have found that these solvents extract stronger acids more effectively. AcknowledgmentThe authors acknowledge helpful discussion withThe liquid-vapor equiiibrlum has been determined in the ternary system hexamethyidisiioxane (HMDS)-CHCi3-CS2 by employing the ebuiiiometric method under isobaric conditions at an atmospheric pressure of 758 mmHg. The infrared spectroscopic technique has been used for determlnatlon of the composition of the liquid and vapor phases. Analytical bands for HMDS, CS2, and CHCIS were 2900, 2160, and 3010 cm-', respectlvely. The system has been found to form one phase and to be reotroplc. Table I. Excess Volumes of Mixtures Containing Tetrahydrofuran at 298.15 K The excess enthalpies and excess volumes of mixtures of tetrahydrofuran wlth benzene, toluene, and xylenes were measured at 298.15 K as a function of composition. HEand VE values have been found to be negative for these systems. These results are consistent with complex formation between the unlike molecules and provide further evidence for electron donor capaclty of ethers with aromatlc hydrocarbons.

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“…Consequently, separation of this acid from aqueous solutions is an economically and environmentally crucial issue. In the earliest investigations, several authors have reported many LLE data on systems containing water, PA, and organic solvents from different chemical categories. − Subsequently, important studies have been carried out on the acid extraction from water and LLE measurements by several researchers. − Mainly, hydrocarbons and halogenated hydrocarbon, − ketones, − heavy alcohols, − esters and dibasic esters, − nitriles, , and ethers have been examined for the LLE measurements. In the latest investigations, Özmen and co-worker have reported further equilibrium data for the related PA containing systems.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Correlated Liquid–Liquid Equilibrium Data for (Water + Propionic Acid + Ethylbenzene or Benzyl Benzoate) Ternary Systems

Gilani

Kashef

2020

J. Chem. Eng. Data

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This paper reports the ternary liquid−liquid equilibrium (LLE) data for water−propionic acid−ethylbenzene at T = (308.2 and 318.2) K and water− propionic acid−benzyl benzoate systems at T = (298.2, 308.2, and 318.2) K and p = 0.1 MPa for the first time. Solubility data and mutual solubilities between ethylbenzene or benzyl benzoate and water were measured using the traditional cloud point method. Tie lines were experimentally obtained using acidimetric titration, the Karl Fisher titration and the refractive index measurements on the both aqueous and organic phases. The ternary systems exhibit type-1 phase behavior. The reliability of the tie-line data exhibited linear behavior in the Hand and Othmer−Tobias correlation plots. The experimental tie line data were correlated using the nonrandom two-liquid and universal quasichemical thermodynamic models, and the corresponding binary interaction parameters were determined. The results demonstrate the capability of the two models in correlation and description of the phase behavior of the related ternary systems with acceptable average root-mean-square deviation (rmsd) values. As a result, temperature has only a minor effect on the LLE behavior of the system containing benzyl benzoate.

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Liquid-liquid phase equilibrium for ternary systems hexamethyldisiloxane-acetic acid (propionic acid)-water

Cited by 18 publications

References 0 publications

Comparative Analysis of Liquid–Liquid Equilibria for Aqueous Systems of Propionic Acid with Structurally Similar Aryl Solvents

Comparative Analysis of Liquid–Liquid Equilibria for Aqueous Systems of Propionic Acid with Structurally Similar Aryl Solvents

Infrared spectroscopic determination of the liquid-vapor equilibrium in the ternary system hexamethyldisiloxane-chloroform-carbon disulfide

Experimental and Correlated Liquid–Liquid Equilibrium Data for (Water + Propionic Acid + Ethylbenzene or Benzyl Benzoate) Ternary Systems

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