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    Effect of Diluents on the Extraction of Fumaric Acid by Tridodecyl Amine (TDA)
    (Amer Chemical Soc, 2015) Gemici, Aysegul; Uslu, Hasan; Gok, Asli; Kirbaslar, S. Ismail
    Separation of fumaric acid from aqueous media with tridodecyl amine (TDA), which is a long chain aliphatic amine, was carried out at 298 K. Different categories of diluents, ketones (methyl iso butyl ketone (MIBK), 2-heptanone, and 2-octanone) and alcohols (isoamyl alcohol, 1-octanol) and 1-decanoL) were used to dissolve TDA. Distribution coefficients (K-D), extraction efficiency (E), and loading factors (Z) were obtained as a function a experimental results. The most operative diluent was determined as heptan-2-one with the highest distribution coefffdent (KD) value of 26.00. In additional to experimental studies, the linear solvation energy relationship (LSER) modeling with included Hidebrand Hansen solubility parameters was applied for alcoholic diluents. Predicted data by LSER gave good agreement with experimental data.
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    Liquid-liquid equilibria of (water plus butyric acid plus diethyl succinate or diethyl glutarate or diethyl adipate) ternary systems
    (Elsevier Science Bv, 2011) Gok, Asli; Kirbaslar, S. Ismail; Uslu, Hasan; Gilani, H. Ghanadzadeh
    Liquid-liquid equilibrium (LLE) data of the solubility (binodal) curves and tie-line end compositions were examined for mixtures of [(water (1)+ butyric acid (2) + diethyl succinate or diethyl glutarate or diethyl adipate (3)1 at 298.2 K and 101.3 +/- 0.7 kPa. The relative mutual solubility of butyric acid is higher in the diethyl succinate or diethyl glutarate or diethyl adipate layers than water layers. The consistency of the experimental tie-lines was determined through the Othmer-Tobias correlation equation. The LLE data were correlated with NRTL model, indicating the reliability of the NRTL equations for these ternary systems. The best results were achieved with the NRTL equation, using non-randomness parameter (alpha = 0.3) for the correlation. Distribution coefficients and separation factors were measured to evaluate the extracting capability of the solvents. (C) 2011 Elsevier B.V. All rights reserved.
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    Liquid-Liquid Equilibria of the (Water plus Ethanol plus Linalyl Acetate) Ternary System at Different Temperatures
    (Amer Chemical Soc, 2011) Gok, Asli; Cebeci, Fatma; Uslu, Hasan; Kirbaslar, S. Ismail
    Liquid liquid equilibrium (LLE) data of the solubility curves and tie-line compositions were examined of the (water + ethanol + linalyl acetate) system at T = (298.2, 308.2, and 318.2) K and P = 101.325 kPa. The relative mutual solubility of ethanol is higher in the water phase than in the linalyl acetate phase. The consistency of the experimental tie lines was determined through the Bachman correlation equation. The experimental I,LE data were satisfactorily correlated with the nonrandom two-liquid model (NRTL), and the binary interaction parameters so obtained are reported. The best results were obtained with the NRTL method, using nonrandomness parameter (alpha = 0.3) for the correlation. Distribution coefficients (D) and separation factors (S) were evaluated over the immiscibility region. The influence of temperature on the LLE characteristics was found to be significant at the temperatures studied.
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    Phase equilibria of (water plus butyric acid plus butyl acetate) ternary systems at different temperatures
    (Elsevier, 2014) Bayazit, Kayhan; Gok, Asli; Uslu, Hasan; Kirbaslar, S. Ismail
    Phase equilibrium (LLE) data of the solubility (binodal) curves and tie-line end compositions were examined for mixtures of {(water (1) + butyric acid + butyl acetate (2)1 at T=298.2 K, 308.2 K, and 318.2 K and 101.3 +/- 0.7 kPa. The relative mutual solubility of butyric acid is higher in the butyl acetate than water layers at the all temperatures used in this study. The consistency of the experimental tie-lines was determined through the Othmer-Tobias correlation equation. The LLE data were correlated with UNIQUAC and NRTL model, indicating the reliability of the NRTL and UNIQUAC equations for these ternary systems. The best results were achieved with the UNIQUAC equation for the correlations. Distribution coefficients and separation factors were measured to evaluate the extracting capability of the solvent. (c) 2014 Elsevier B.V. All rights reserved.
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    Phase equilibria of (water plus levulinic acid plus dibasic esters) ternary systems
    (Elsevier Science Bv, 2009) Uslu, Hasan; Gok, Asli; Kirbaslar, S. Ismail
    Liquid-liquid equilibrium (LLE) data of the solubility (binodal) curves and tie-line end compositions were examined for mixtures of ((water (1)+levulinic acid (2)+dimethyl succinate or dimethyl glutarate or dimethyl adipate (3)) at 298.15 K and 101.3 +/- 0.7 kPa. The reliability of the experimental tie-line data was confirmed by using the Othmer-Tobias correlation. The LLE data of the ternary systems were predicted by UNIFAC method. The LLE data were correlated fairly well with UNIQUAC and NRTL models, indicating the reliability of the UNIQUAC and NRTL equations for these ternary systems. The best results were achieved with the NRTL equation, using non-randomness parameter (alpha = 0.3) for the correlation. Distribution coefficients and separation factors were measured to evaluate the extracting capability of the solvents. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
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    Reactive Extraction of (E)-Butenedioic Acid (Fumaric Acid) by Nontoxic Diluents
    (Amer Chemical Soc, 2014) Uslu, Hasan; Gemici, Aysegul; Gok, Asli; Kirbaslar, S. Ismail
    In this work, the equilibrium distribution of (E)-butenedioic acid (fumaric acid) between water and tridodecylamine (TDDA) or tributylamine (TBA) was carried out at 298 K. The organic phase was prepared using both TDDA and TBA in three nontoxic diluents (canola oil, sesame oil, and almond oil). The batch equilibrium experimental data are presented by calculation of the loading factor (Z), extraction efficiency (E), and distribution coefficient (K-D). The highest extraction efficiencies of 92.59 % and 92.50 % with values of KD equal to 12.50 and 12.40 were obtained with 0.789 mol center dot kg1 TDDA in canola oil and 2.080 mol.kg(1) TBA in canola oil. The extraction abilities of TDDA and TBA in different nontoxic natural diluents in terms of K-D and E were found to be in the order of canola oil > almond oil > sesame oil. Partition coefficients (P = 0.3819, 0.4739, and 0.7535) and dimerization constants (D = 83.64, 50.28, and 43.51) were calculated according to physical extraction for sesame oil, almond oil, and canola oil, respectively.