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Author: search.filters.author.Phatanasri, Suphot

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    The role of organic diluents in the aspects of equilibrium, kinetics and thermodynamic model for silver ion extraction using an extractant D2EHPA
    (2015-02-05)
    Wongsawa, Thidarat
    ;
    Sunsandee, Niti
    ;
    Lothongkum, Anchaleeporn Waritswat
    ;
    Pancharoen, Ura
    ;
    Phatanasri, Suphot
    The effects of organic diluents regarding the aspects of equilibrium data, kinetics of extraction behavior and thermodynamic model are of great importance in the extraction processes. Therefore, these effects were investigated for silver ion extraction by a liquid-liquid extraction process using D2EHPA as an extractant. Various organic diluents that have different dielectric constants like kerosene, cyclohexane, chloroform and 1-octanol were selected for use in this work. The equilibrium data of solubility and tie-lines for the ternary systems of water. +. D2EHPA. +. organic diluents exhibited type-2 LLE behavior at a temperature of 298.2. K and atmospheric pressure. Moreover, the uncertainty propagation calculation was determined to validate the reliability of the data. The extraction efficiency of silver ions for each organic diluent was also investigated; maximum extraction of 94% was obtained for 1-octanol. The extraction behaviors of silver ion with D2EHPA in the different organic diluents were reported as regards their reaction stoichiometry. They were also analyzed by spectroscopic analysis. Results of the thermodynamic NRTL model were obtained and a very good correlation with the experimental LLE data was confirmed by the root-mean square deviation (. rmsd) values of 1%.
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    Effect of diluent polarity on membrane stability in the separation of trace Pd(II) from wastewater by HFSLM using LIX84-I
    (2015-01-25)
    Wongkaew, Kraiwith
    ;
    Pancharoen, Ura
    ;
    Phatanasri, Suphot
    ;
    Leepipatpiboon, Natchanun
    ;
    Lothongkum, Anchaleeporn W.
    In a liquid membrane, the type of diluents for the selected extractant plays an important role in membrane stability and separation efficiency. High Pd(II) extraction and stripping of 96% and 91%, respectively, were observed by HFSLM under a feed pH 2, 5% (v/v) LIX84-I dissolved in kerosene and a mixture of 0.8M NH<inf>2</inf>CSNH<inf>2</inf> with 1M HCl as a stripping solution. The highest stability was attained at 350min by using hexane as a diluent. Finally, the calculated activation energy (E<inf>a</inf>) of 30 kJ/mol implied that the separation of Pd(II) was controlled by the diffusion and chemical reaction.
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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.