Hasan Uslu | Niğde Ömer Halisdemir Üniversitesi / Nigde Omer Halisdemir University (original) (raw)

Publications by Hasan Uslu

An equilibrium isotherm of benzylformic acid with phosphoric acid tributyl ester in carbon tetrac... more An equilibrium isotherm of benzylformic acid with phosphoric acid tributyl ester in carbon tetrachloride, decanol, kerosene, toluene, and xylene at 298 K has been studied. The equilibrium data are discussed in terms of partition coefficient (P), dimerization constant (D), overall equilibrium complexation constant (E), and loading factor (ϕ). Moreover, the distribution coefficient (KD) and extraction efficiency (η%) with phosphoric acid tributyl ester in CCl4 is 0.199 to 52.1 and 16.6 to 98.1; in decanol, 5.66 to 45.9 and 85 to 97.9; in kerosene, 0.03 to 73.2 and 2.9 to 98.7; in toluene, 0.381 to 70.3 and 27.6 to 98.6; and in xylene, 0.322 to 57.7 and 24.3 to 98.3, respectively. The extraction efficiency of benzylformic acid was found to be more than 95 % with all these diluents. Loading factor ϕ < 0.5 was observed and it indicates that only 1:1 benzylformic acid–phosphoric acid tributyl ester complex in above said diluents were formed. Furthermore, the values of overall equilibrium complexation are determined with the relative basicity model using experimental result.

Industrial & Engineering Chemistry Research, 2009

Investigation of adsorption parameters such as effect of initial acid concentration, effect of am... more Investigation of adsorption parameters such as effect of initial acid concentration, effect of amount of adsorbent, effect of temperatures, effect of contact time, fitting data to isotherms, and kinetic models for propionic acid and tartaric acid by using Amberlite IRA-67 adsorbent was studied. The maximum adsorption efficiencies were found to be 97.18% and 84.46% for tartaric acid and propionic acid, respectively. The best fitted isotherm was determined to be Langmuir for tartaric acid. The Langmuir isotherm was better fitted than the Frundlich isotherm for both acids. Elovich model equation was applied for data of each acids. The kinetics of the adsorption for both acids was determined as pseudo-secondorder model.

Desalination and Water Treatment, 2012

An organic dye, methylene blue (MB), was separated from a model aqueous solution by using adsorpt... more An organic dye, methylene blue (MB), was separated from a model aqueous solution by using adsorption method with low cost resin adsorbents. The adsorption of MB was studied with Amberlite XAD-16 and Amberlite XAD-7 HP. The aim of the study is to achieve a high removal value of the dye and comparing these two adsorbents for MB adsorption. Adsorption of MB was investigated in terms of equilibrium and kinetics conditions. Adsorption isotherms were determined and correlated with equations such as Freundlich, Langmuir and Temkin isotherm models. Langmuir isotherm has good agreement with R 2 value over 0.99. Pseudo second order model was fitted for this adsorption system. Here we showed that 99% removal of MB can be achieved with Amberlite XAD-16. SEM studies revealed the morphological observations of the unloaded adsorbent and the changes in the adsorbed polymeric resin. FTIR spectrums of adsorbents before and after the adsorption supported the SEM results.

International Journal of Chemical Reactor Engineering, 2010

The most common reaction system studied for the application of pervaporation (PV) is an esterific... more The most common reaction system studied for the application of pervaporation (PV) is an esterification reaction between alcohol and acid in the presence of a catalyst. In present paper, performance of pervaporation reactor (PVR) for esterification of acetic acid with ethanol was studied. Model equations were developed for reaction and separation in PVR. Model results were validated with experimental results and excellent comparison was obtained. The effect of various parameters such as: reactant ratio, ratio of effective membrane area to volume of reacting mixture, catalyst concentration and flux on the performance of PVR were discussed. The optimum conditions were obtained as: membrane area to volume of reacting mixture = 2 m −1 , reactant ratio = 1.5, catalyst concentration = 50 g/l for esterification of acetic acid with ethanol in PVR. The model presented can also be used for the other esterification reactions. The described model allows the evolution of the reaction time necessary to achieve a given conversion. The process parameters: temperature, catalyst concentration, initial molar ratio of acid to alcohol, the ratio of the effective membrane area to the volume of reacting mixture can be changed in order to attain the optimum operating conditions of the pervaporation-esterification coupling operating.

Journal of Chemical and Engineering Data, 2009

Carboxylic acids like citric acid are produced by fermentation. They have been used in many indus... more Carboxylic acids like citric acid are produced by fermentation. They have been used in many industrial fields as intermediate and starting materials, and their importance is still growing. It is important to separate them from the fermentation broth. In this sense, comparison of different types of solvents and amines for extraction of carboxylic acids from the fermentation broth and the most effective amine-solvent composition is sought. Studies have been performed on the extraction of citric acid from fermentation broth by tridodecylamine (TDA) (a long chain tertiary amine), and Amberlite LA-2 (a secondary amine mixture). These extractants were dissolved in different solvents having different chemical structures. The extractions were carried out at 298 K. Comparison of the results were made using the distribution coefficient, loading factor, separation factor, and the percentage of extraction yield. The most effective solvent was determined as 1-octanol for both TDA and Amberlite LA-2 with a distribution value of 29.63 and 103.80, respectively. The maximum value of the extraction efficiency was found to be 99.05 % with Amberlite LA-2 in 1-octanol. Figure 4. (a) Variation of distribution coefficients in 2.62 mol · L -1 concentration of TDA in different initial citric acid concentration. (b) Variation of distribution coefficients in 3.70 mol · L -1 concentration of Amberlite LA-2 in different initial citric acid concentration

Fluid Phase Equilibria, 2009

Propionic acid is an important carboxylic acid widely used in chemical industries. The recovery f... more Propionic acid is an important carboxylic acid widely used in chemical industries. The recovery from aqueous waste streams and fermentation broth is of research interest. Extraction of carboxylic acids by reactive extraction using extractant-diluent, mixed extractants in diluents and extractants in mixed diluents etc. are emerging areas of study. With this aim reactive extraction of propionic acid was carried out to study: (i) effect of binary extractants (tri-n-octylamine(TOA):tri-n-butylphosphate (TBP), TOA:Aliquat 336 and TBP:Aliquat 336), (ii) effect of modifier (1-decanol) in different diluents (kerosene, n-octane, n-heptane, petroleum ether, butyl acetate, MIBK, 2-octanol, dodecanol, hexane) and (iii) effect of phase volume. Improved extractions using binary extractants and binary diluents were observed. Since liquid–liquid extraction is dependent on effect of modifier concentration, effect of phase volume, presence of single or binary extractants and binary diluents, the study will be useful in the design of reactive extraction process for propionic acid recovery.

Separation Science and Technology, 2008

Levulinic acid, a carboxylic acid containing ketone structure, is a clear to brownish semi‐solid ... more Levulinic acid, a carboxylic acid containing ketone structure, is a clear to brownish semi‐solid melting at 37°C; soluble in alcohol, ether, and chloroform, levulinic acid can be used as an acidulant in foods and beverages. Organic solutions of amines are being used increasingly to separate organic acids from aqueous mixture solutions by reactive extraction. The design of an amine extraction

Journal of Chemical and Engineering Data, 2009

ABSTRACT The production of organic acids at relatively low concentrations in aqueous solutions is... more ABSTRACT The production of organic acids at relatively low concentrations in aqueous solutions is typical of both electrochemical and biochemical syntheses. The recovery of these solute species can be achieved by solvent extraction, and the reactive recovery of carboxylic acids from aqueous solutions has received increasing attention. In this study the reactive extraction of levulinic acid was done at 298.15 K, and all experiments were reported on the extraction of levulinic acid by Amberlite LA-2 dissolved in five different esters (dimethyl phthalate, dimethyl adipate, dimethyl succinate, dimethyl glutarate, and diethyl carbonate), five different alcohols (isoamyl alcohol, hexan-1-ol, octan-1-ol, nonan-1-ol, and decan-1-ol) and two different ketones (diisobutyl ketone (DIBK) and methyl isobutyl ketone (MIBK)). Furthermore, single pure solvents (not containing Amberlite LA-2) were used for physical extraction. Experimental results of batch extraction experiments were calculated and reported as distribution coefficients (KD), loading factors (TT), stoichiometric loading factors (TS), separation factors (Sf) and extraction efficiencies (E). The isoamyl alcohol was found to be the most effective solvent with a maximum distribution value (KD) of 68.017. According to the data determined from the experiments, a linear solvation energy relationship (LSER) model equation was found to calculate loading factors (TT) for the alcohols with an R2 value of 0.98.

Journal of Chemical and Engineering Data, 2008

... Experimental results of batch extraction experiments are calculated and reported as distribut... more ... Experimental results of batch extraction experiments are calculated and reported as distribution coefficients (K D = c̅ HA /c HA,total ), loading factors (T T ), stoichiometric loading factor (T S ), separation factor (S f ), and extraction efficiency (E). The diethyl carbonate was found ...

Separation Science and Technology, 2011

Separation of 2,4,6-trinitrophenol (Picric acid) from aqueous solution by trioctyl amine (TOA), w... more Separation of 2,4,6-trinitrophenol (Picric acid) from aqueous solution by trioctyl amine (TOA), which is a long-chain aliphatic amine, has been studied at 298 K. Diluents (alcohols) (isoamyl alcohol, octan-1-ol, decan-1-ol) have been used to dissolve TOA. Experimental results of batch extraction are calculated and reported as distribution coefficients (KD), loading factors (Z), and extraction efficiency (E). The most effective diluent has been found to be isoamyl alcohol with a distribution coefficient value of 19.333. In this article, the linear solvation energy relationship (LSER) modeling (included Hidebrand-Hansen solubility parameters) has been done on the reactive extraction of picric acid to obtain the model parameters. Modeling using an LSER model predict a close resemblance of experimental data.

Papers by Hasan Uslu

Reactive extraction is an important recovery method for extraction of propionic acid from dilute ... more 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 de- sign of the process. In this paper, the linear solvation energy relationship

Http Dx Doi Org 10 1080 00319100802578777, Nov 9, 2009

Isobaric vapour–liquid equilibrium data have been measured for the binary systems toluene (1) + a... more Isobaric vapour–liquid equilibrium data have been measured for the binary systems toluene (1) + acetic acid (2) and toluene (1) + methyl ethyl ketone (2) at atmospheric pressure. An all-glass Fischer–Labodest-type apparatus, capable of handling pressures from 0.25 to 400 kPa and temperatures up to 523.15 K was used. The data were correlated by means of the NRTL, UNIQUAC, WILSON

This study presents linear solvation energy relationship (LSER) modeling of reactive extraction o... more This study presents linear solvation energy relationship (LSER) modeling of reactive extraction of propionic acid using Aliquat 336 in MIBK as diluent. Reaction was slow in Aliquat 336 + MIBK with rate constant at 0.0079 (m 3 /kmol) 0.55 s -1 . Order of reaction with respect to acid and Aliquat 336 was 1 and 0.9 respectively. Modeling of reactive extraction equilibria using LSER was carried out and predicted a close resemblance of experimental data.

Fluid Phase Equilibria, Apr 1, 2007

The extraction of tartaric acid with Alamine 336 which is a mixture of tertiary amines (C8–C10) d... more The extraction of tartaric acid with Alamine 336 which is a mixture of tertiary amines (C8–C10) dissolved in five single solvents (cyclohexane, hexane, toluene, methyl isobutyl ketone, butan-1-ol) and three binary solvent mixtures (MIBK+toluene (50%, v/v), MIBK+hexane (50%, v/v), hexane+toluene (50%, v/v)) were investigated. All measurements were carried out at 298.15K. The extent to which the organic phase may be

Fluid Phase Equilibria, 2010

In this study malic acid were extracted from aqueous solution by different solvents with and with... more In this study malic acid were extracted from aqueous solution by different solvents with and without trioctylamine (TOA). The TOA was dissolved in five different esters (dimethyl phthalate, dimethyl adipate, dimethyl succinate, dimethyl glutarate, and diethyl carbonate), five different alcohols (isoamyl alcohol, hexan-1-ol, octan-1-ol, nonan-1-ol, and decan-1-ol) and two different ketones (diisobutyl ketone (DIBK) and methyl isobutyl ketone (MIBK)). The

Journal of Chemical and Engineering Data, 2009

The adsorption equilibria of L-(+)-tartaric acid onto alumina from wastewaters of wineries were s... more The adsorption equilibria of L-(+)-tartaric acid onto alumina from wastewaters of wineries were studied, and it has been found that the equilibrium adsorption fits the Langmuir and Freundlich isotherms. Adsorption experiments were carried out at three different temperatures (298, 310, and 325) K. The adsorption of L-(+)tartaric acid is dependent on the acid concentration and the amount of alumina. The maximum percentage removal of L-(+)-tartaric acid was 22 % by alumina at 298 K. The Langmuir and Freundlich constants have been found to be 0.023 g · g -1 and 0.014 (g · g -1 )/(L · g -1 ) -1/n , respectively, at 298 K. The thermodynamic parameters ∆H ads 0 and ∆S ads 0 for the adsorption of tartaric acid on alumina have been calculated to be -5.62 kJ · mol -1 and 50.65 J · mol -1 · K -1 , respectively.

Journal of Chemical and Engineering Data, 2010

Http Dx Doi Org 10 1080 19443994 2014 911707, Apr 16, 2014

ABSTRACT Herein, since the extraction of organic acids is very important for recovery, acrylic ac... more ABSTRACT Herein, since the extraction of organic acids is very important for recovery, acrylic acid was investigated from aqueous solutions by different diluents of trioctylamine (TOA). The extraction of acrylic acid with TOA dissolved in various individual solvents has been worked. Solvents have selected as dimethyl phthalate (DMP), cyclohexyleacetate (CHA), methyl isobutyl ketone, 2-octanone, 1-octanol, and 1-decanol. The experimental results of experiments are reported as distribution coefficients, D, loading factors, Z, and extraction efficiency, E. It is essential to improve extraction by adding extractant. The maximum removal of acrylic acid is 97.32% with DMP 1.15 mol/kg initial concentration of TOA. Here in, the LSER model has been applied to TOA + alcohol systems on extraction of acrylic acid to make predictions of distribution coefficient.

Industrial & Engineering Chemistry Research, 2009

Desalination and Water Treatment, 2012

International Journal of Chemical Reactor Engineering, 2010

Journal of Chemical and Engineering Data, 2009

Fluid Phase Equilibria, 2009

Separation Science and Technology, 2008

Journal of Chemical and Engineering Data, 2009

Journal of Chemical and Engineering Data, 2008

Separation Science and Technology, 2011

Http Dx Doi Org 10 1080 00319100802578777, Nov 9, 2009

Fluid Phase Equilibria, Apr 1, 2007

Fluid Phase Equilibria, 2010

Journal of Chemical and Engineering Data, 2009

Journal of Chemical and Engineering Data, 2010

Http Dx Doi Org 10 1080 19443994 2014 911707, Apr 16, 2014

The presence of nitrophenols in wastewater is of great environmental concern. Therefore, it is im... more The presence of nitrophenols in wastewater is of great environmental concern. Therefore, it is important to separate picric acid from wastewater streams. In this study, adsorption of picric acid was studied from aqueous solutions by using a weakly basic adsorbent (Amberlite IRA-67) at three different temperatures (298 K, 308 K, and 318 K). Adsorption of picric acid was investigated in terms of equilibrium, kinetics, and thermodynamic conditions. In the equilibrium studies, 1.00 g of Amberlite IRA-67 was determined as the optimal amount. The most used isotherms, Freundlich and Langmuir, were applied to the experimental data. The Langmuir isotherm gave good results with R squared values over 0.99 at different temperatures. In the kinetic studies, pseudofirst-and pseudosecond-order models and the Elovich equation were applied to the kinetic experiments. The pseudosecond-order model was fitted to this adsorption system with an R squared value of 0.996. In the thermodynamic studies, ∆H ads 0 ) -21.204 kJ · mol -1 , ∆S ads 0 ) -200.043 J · mol -1 · K -1 , and ∆G ads 0 for different temperatures were calculated.

Journal of Chemical and Engineering Data, Aug 10, 2007

... In our earlier studies, we investigated the reactive extraction of glycolic acid, gluconic ac... more ... In our earlier studies, we investigated the reactive extraction of glycolic acid, gluconic acid, and ... of parameters of the model are presented in Table 6. The comparison of the ... to a solute's partition coefficient, which means that the organic solute/amine partitioning equilibrium of a ...

Journal of Chemical and Engineering Data, Aug 5, 2010

Separation Science and Technology, Jan 18, 2013

ABSTRACT The (3S,3aS,4S,4aS,7S,9aR,9bR,12S)-7,12-dihydroxy-3-methyl-6-methylene-2-oxoperhydro-4a,... more ABSTRACT The (3S,3aS,4S,4aS,7S,9aR,9bR,12S)-7,12-dihydroxy-3-methyl-6-methylene-2-oxoperhydro-4a,7-methano-9b,3-propenoazuleno[1,2-b]furan-4-carboxylic acid (Gibberellic acid (GA)) extraction from aqueous solution by Amberlite La-2 in different diluents (isoamyl alcohol, or octan-1-ol, or decan-1-ol) was studied. According to experimental results, some thermodynamic parameters such as distribution coefficients (KD), loading factors (Z), and extraction efficiency (E) were calculated. The best extraction efficiency, distribution coefficient, and loading factor were determined by isoamyl alcohol diluent at values of 98 %, 97, and 4.6, respectively. Besides, the linear solvation energy relationship (LSER) model regressed to experimental results with a regression coefficient (R square) of 0.98. The LSER model predicts results close to experimental data.

Chemical Engineering Journal, Dec 1, 2009

Formic acid is an important chemical and biochemical compound used in various industries. It is i... more Formic acid is an important chemical and biochemical compound used in various industries. It is important to separate this acid from wastewater streams. In this study, adsorption of formic acid was studied from aqueous solution by using weakly basic adsorbent (Amberlite IRA-67) at three different temperatures (298 K, 318 K, and 328 K). Adsorption of formic acid was investigated in terms of equilibrium, kinetics and thermodynamic conditions. Optimal amount of IRA-67 was determined as 1.00 g. The most used isotherms, Freundlich and Langmuir, were applied to experimental data. Langmuir isotherm gave good results with R 2 value over 0.99 at different temperatures. Pseudo-second-order model was fitted for this adsorption system. Thermodynamic parameters, H • ads , S • ads and G • ads , were calculated.

The Journal of Chemical Thermodynamics, Sep 1, 2009

The extraction of levulinic acid by tricaprylmethylammonium chloride (Aliquat 336) dissolved in f... more The extraction of levulinic acid by tricaprylmethylammonium chloride (Aliquat 336) dissolved in five alcohols solvents (isoamyl alcohol, hexan-1-ol, octan-1-ol, nonan-1-ol, decan-1-ol) and five esters solvents (dimethyl phthalate, dimethyl adipate, dimethyl succinate, dimethyl glutarate, diethyl carbonate), two ketones (diisobutyl ketone (DIBK), methyl isobutyl ketone (MIBK)) were investigated to understand effect of modifier on levulinic acid extraction. In addition to these Aliquat 336 + modifier system, the experiments were done also with single solvents. All measurements were carried out T = 298.15 K. Organic solutions of Aliquat 336 are being used increasingly to separate organic acids from aqueous mixture solutions by reactive extraction. The extent to which the organic phase may be loaded with levulinic acid is explained as a loading ratio, Z Z , extraction efficiency E and, distribution coefficients K D were calculated. The maximum extraction efficiency was obtained value of 72.1 for isoamyl alcohol. The extraction equilibrium constant, K E, has been calculated for each modifier. Furthermore, Freundlich, Langmuir, and LSER model equations have been obtained for experimental data of alcohols.

Journal of Chemistry, Sep 20, 2014

The prospective function of a novel energy efficient fermentation technology has been getting gre... more The prospective function of a novel energy efficient fermentation technology has been getting great attention in the past fifty years due to the quick raise in petroleum costs. Fermentation chemicals are still limited in the modern market in huge part because of trouble in recovery of carboxylic acids. Therefore, it is needed considerable development in the current recovery technology. Carboxylic acids have been used as the majority of fermentation chemicals. This paper presents a state-of-the-art review on the reactive extraction of carboxylic acids from fermentation broths. This paper principally focuses on reactive extraction that is found to be a capable option to the proper recovery methods.

Fluid Phase Equilibria, 2009

... Permissions &amp; Reprints. Phase equilibria of (water + levulinic acid + dibasic est... more ... Permissions &amp; Reprints. Phase equilibria of (water + levulinic acid + dibasic esters) ternary systems. Hasan Uslu a , b , Corresponding Author Contact Information , E-mail The Corresponding Author , Aslı Gök b and Ş. İsmail Kırbaşlar b. ...

Journal of Chemical and Engineering Data, Jun 10, 2009

The reactive extraction equilibria for aqueous solutions of glutaric acid, with trioctylamine (TO... more The reactive extraction equilibria for aqueous solutions of glutaric acid, with trioctylamine (TOA) in various diluents, including isoamyl alcohol, octan-1-ol, nonan-1-ol, decan-1-ol, methyl ethyl ketone (MEK), diisobutyl ketone (DIBK), hexan-2-one, toluene, kerosene, and n-hexane, were determined at various TOA concentrations. Experimental results of batch extraction experiments are calculated and reported as distribution coefficients (K D ), loading factors (Z), and extraction efficiency (E). All measurements were carried out at 25°C. Kerosene was found to be the most effective diluent with the highest value of K D (7.88). The complexation constants K 11 and K 21 were calculated for each diluent. The results of the liquid-liquid equilibrium measurements were correlated by a linear solvation energy relationship (LSER) model which takes into account physical interactions and modified Freundlich and Langmuir equations. Experimental results of the glutaric acid extraction are compared to model results.