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Öğe Extracion of citric acid in 2-octanol and 2-propanol solutions containing tomac: An equilibria and a LSER model(Brazilian Soc Chemical Eng, 2008) Uslu, H.Studies on the extraction of citric acid by TOMAC (trioctyl methyl ammonium chloride) dissolved in 2-propanol and 2-octanol (active solvents) and their mixture (1 : 1 volume ratio) are reported. Experimental results of batch extraction experiments are calculated and reported for partitioning coefficients (D), loading factors (Z), and extraction efficiency (E). All measurements were carried out at 298.15 K. The results Of the liquid-liquid equilibrium measurements were correlated with a linear solvation energy relationship (LSER) model which takes into account physical interactions. Solvatochromic parameters of the model were obtained from the literature. The remaining parameters were fitted to the experimental results. Experimental results for the liquid-liquid equilibrium were compared to the model.Öğe Liquid phase equilibria of the system (water plus phosphoric acid+1-octanol) at T=(298.2, 308.2, and 318.2)K(Elsevier Science Bv, 2012) Gilani, H. Ghanadzadeh; Gilani, A. Ghanadzadeh; Shekarsaraee, S.; Uslu, H.Experimental solubility and tie-line data for the ternary system of (water + phosphoric acid + 1-octanol) were measured at T=(298.2. 308.2, and 318.2)K and atmospheric pressure. Data for the binodal curves were determined by cloud-point titration method. The concentration of each phase was determined by acidimetric titration, the Karl-Fischer technique, and refractive index measurements. A type-1 LLE phase diagram was obtained for this ternary system. The experimental tie-line data were correlated using the UNIQUAC and NRTL models. The reliability of the experimental data was determined through the Othmer-Tobias and Hand plots. Distribution coefficients and separation factors were evaluated over the immiscibility regions. The effect of temperature on the biphasic region of the ternary system and separation factor was found to be small at the temperatures studied. The Katritzky LSER model was applied to correlate distribution coefficients and separation factors in this ternary system. (C) 2011 Elsevier B.V. All rights reserved.Öğe (Liquid plus liquid) equilibrium data of (water plus phosphoric acid plus solvents) systems at T = (308.2 and 318.2) K(Academic Press Ltd- Elsevier Science Ltd, 2012) Gilani, H. Ghanadzadeh; Gilani, A. Ghanadzadeh; Shekarsaraee, S.; Uslu, H.Ternary equilibrium data for the mixtures of {water + phosphoric acid + organic solvent (cyclohexane, methylcyclohexane, and toluene)} were determined at T = (308.2 and 318.2) K and atmospheric pressure. Solubility data were determined by the cloud-point titration method. In order to obtain the tie-line data, the concentration of each phase was determined by acidimetric titration, the Karl-Fischer technique, and refractive index measurements. The experimental tie-line data were correlated using the UNIQUAC and NRTL models. The reliability of the experimental data was determined through the Othmer-Tobias and Hand plots. Distribution coefficients and separation factors were evaluated over the immiscibility regions. The Katritzky LSER model was applied to correlate distribution coefficients and separation factors in these ternary systems. (C) 2012 Elsevier Ltd. All rights reserved.Öğe Reactive Extraction of Propionic Acid Using Aliquat-336 in 2-Octanol: Linear Solvation Energy Relationship (LSER) Modeling and kinetics Study(Croatian Soc Chemical Engineering Technology, 2010) Keshav, A.; Wasewar, K. L.; Chand, S.; Uslu, H.Reactive extraction is an important recovery method for extraction of propionic acid from dilute streams, providing numerous advantages like high selectivity and recovery. Equilibrium and kinetic study of reactive extraction is essential to choose a proper extractant-diluent for acid recovery and ascertain the kinetic parameters essential for design of the process. In this paper, the linear solvation energy relationship (LSER) modeling of reactive extraction of propionic acid using Aliquat 336 in 2-octanol as diluent was presented to obtain the model parameters. Also, the kinetics of extraction in stirred cell was presented to explain the progress of reactive extraction of propionic acid using Aliquat 336 in the diluent. The reaction was found to be fast pseudo first order. To design the reactor to carry out reactive extraction, the kinetic parameters evaluated are essential. Modeling using LSER model predict a close resemblance of experimental data.