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Author: search.filters.author.Hronec, MilanSubject: search.filters.subject.Solubility

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    Experiments and thermodynamic models for ternary (liquid-liquid) equilibrium systems of water + cyclopentanone + organic solvents at T = 298.2 K
    (2014-08-01)
    Wongsawa, Thidarat
    ;
    Hronec, Milan
    ;
    Lothongkum, Anchaleeporn Waritswat
    ;
    Pancharoen, Ura
    ;
    Phatanasri, Suphot
    The aim of this paper is to obtain liquid-liquid equilibrium (LLE) data for cyclopentanone extraction. Ternary LLE systems of water + cyclopentanone + organic solvents (MIBK, ethyl acetate, furfural or n-butanol) were investigated at T = 298.2 K and atmospheric pressure. The solubility and tie-line data of these ternary LLE systems were determined by direct analysis. The reliability of the LLE experimental results was validated by the Othmer-Tobias and Hand correlation equations. Distribution coefficients (D) and separation factors (S) were calculated in order to evaluate the capability of selective organic solvents for cyclopentanone extraction. NRTL and UNIQUAC models were employed to correlate the results obtained by the modeling with the experimental data. Good correlation results were confirmed by the rmsd values of less than 6%. © 2014 Elsevier B.V.
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    Thermodynamic models for determination of the solubility of 2,5-bis(2-furylmethylidene)cyclopentan-1-one in different solvents at temperatures ranging from 308.15 to 403.15K
    (2014-04-15)
    Prapasawat, Tatchanok
    ;
    Hronec, Milan
    ;
    Štolcová, Magdaléna
    ;
    Lothongkum, Anchaleeporn Waritswat
    ;
    Pancharoen, Ura
    The solubility data of 2,5-bis(2-furylmethylidene)cyclopentan-1-one (F<inf>2</inf>C) in solid-liquid equilibrium in alternative solvents are vital for a preliminary study of industrial applications aimed at producing sustainable and renewable materials and fuels. The solubility behavior of F<inf>2</inf>C in different solvents, such as tetrahydrofuran, mixed water-tetrahydrofuran (1:1, v/v), methanol, and water at temperatures ranging from 308.15 to 403.15K was investigated. An isothermal method was employed to measure the solubility data of F<inf>2</inf>C. The experimental data showed that the solubility of F<inf>2</inf>C increased as the temperature increased and was strongly affected by the surface tension and polarity index. The solubility of F<inf>2</inf>C in the studied solvents increased in the following order: H<inf>2</inf>O<methanol<H<inf>2</inf>O-THF mixture<THF. The thermodynamic models, such as the polynomial empirical equation, the Van't Hoff, and the modified Apelblat models were investigated to describe the experimental data. It was found that the modified Apelblat model was the most suitable for predicting the solubility behavior of F<inf>2</inf>C with a temperature increment. The calculated thermodynamic parameters indicated that in each studied solvent the dissolution process of F<inf>2</inf>C is endothermic and spontaneous. © 2014 Elsevier B.V.