Papers by Süheyla Çehreli
The Canadian Journal of Chemical Engineering
Journal of Dispersion Science and Technology, 2020
Journal of Chemical & Engineering Data, 2020
The liquid-liquid equilibria of Water-Propionic Acid-Benzyl Alcohol, Water-Propionic Acid-Benzyl ... more The liquid-liquid equilibria of Water-Propionic Acid-Benzyl Alcohol, Water-Propionic Acid-Benzyl Acetate and Water-Propionic Acid-Dibenzyl Ether ternary systems were predicted by means of UNIFAC Model. For this purpose, multivariable Newton-Raphson convergence procedure was used. Experimental and model results were compared.
Biomass Conversion and Biorefinery, 2020
This paper investigates the removal of the antiparkinsonism drug levodopa from aqueous solutions ... more This paper investigates the removal of the antiparkinsonism drug levodopa from aqueous solutions utilizing weakly basic Amberlite resins. In the first step of experimental investigation, the adsorption equilibration time (0–24 h) was determined. After that, the effects of properties such as initial levodopa concentration in the solution (20–100 ppm), adsorbent amount (10–30 mg), pH (2–10), and temperature (25–40 °C) on the adsorption of levodopa with Amberlite IRA-67 were investigated. Adsorption isotherm, kinetic and thermodynamic parameters were also determined. In the next step of experimental research, the impact of adsorbent type was examined by employing the experimental design. This design work was carried out in Design-Expert® Software using D-optimal design based on response surface methodology (RSM). The highest adsorption capacities were achieved as 33.09 mg g−1 for Amberlite IRA-67 and 20.11 mg g−1 for Amberlite IRA-400. These results showed that Amberlite resins were effective in removing levodopa from the water.
International Journal of Environmental Analytical Chemistry, 2020
Entacapone is a drug used for Parkinson’s disease treatment. The contamination of water resources... more Entacapone is a drug used for Parkinson’s disease treatment. The contamination of water resources by this active drug ingredient affects the human health, environment and ecosystem. In the present ...
DESALINATION AND WATER TREATMENT, 2020
Citric acid is one of the most important natural organic acid and extensively used in pharmaceuti... more Citric acid is one of the most important natural organic acid and extensively used in pharmaceuticals, foods, beverages, personal care products and mainly manufactured in the form of aqueous solutions by fermentation processes. In this study, the removal of citric acid from aqueous solutions was investigated by reactive extraction using an extractant namely tributylamine (TBA) in octyl acetate. The effects of different parameters on the removal such as initial extractant (TBA) concentration in octyl acetate (0-1.2 mol L-1), initial citric acid concentration (0.26-0.78 mol L-1) and, organic: aqueous phase ratio (0.2-1.0 v/v) were examined. In order to evaluate the performance of reactive extraction operation, extraction efficiencies (E%), distribution coefficients (D) and loading factors (Z) were calculated by using the experimental data. Furthermore, an optimization work was carried out for the reactive extraction process of citric acid. Response surface methodology was used to optimize the effect of input variables on the reactive extraction. In the variables examined, it was determined that the initial TBA concentration in the organic phase was the most effective parameter for the removal of citric acid from aqueous solutions. The optimum extraction conditions were found to be initial TBA concentration in the organic phase of 1.2 mol L-1 , the initial citric acid concentration of 0.26 mol L-1 and organic: aqueous phase ratio of 1.0 (v/v), respectively. Under these optimum conditions, the predicted and experimental extraction efficiencies were obtained as 86.31% and 82.44%, respectively. The correlation coefficient values (R 2 and adjusted R 2 > 0.9) denoted that the obtained model equation represents the experimental data adequately.
Analytical Letters, 2020
Curcumin, a bio-active phytochemical, is a major component of turmeric. It is also a significant ... more Curcumin, a bio-active phytochemical, is a major component of turmeric. It is also a significant food flavoring and potential therapeutic agent for diverse diseases. The traditional organic solvents are not environmentally friendly because of their features including toxicity, volatility and flammability. For this reason, in this study, the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([BMIM][Tf 2 N]), as an alternative green solvent, was investigated for the extraction of curcumin from turmeric. The curcumin in the turmeric samples under various extraction conditions was determined by the use of high performance liquid chromatography (HPLC). Response surface methodology (RSM) was utilized to investigate the influence of extraction parameters including the time from 10 to 60 min, temperature from 25 to 55 C, and solvent volume from 10 to 30 mL. The experimentally determined curcumin yield ranged between 0.76% and 2.94%. The optimal extraction conditions were obtained employing an extraction time interval equal to 60 min, temperature of 55 C and solvent volume of 30 mL. The maximum curcumin yield extracted from turmeric was 2.94% using the optimal conditions.
Chemical Engineering Communications, 2019
In this study, formic acid removal from its aqueous solutions through bulk ionic liquid membrane ... more In this study, formic acid removal from its aqueous solutions through bulk ionic liquid membrane (BILM) was investigated. Tributyl phosphate (TBP) as a carrier in imidazolium-based ionic liquids was used. D-optimal design based on response surface methodology has been applied to investigate the effect of various operating factors. Initial formic acid concentration, TBP concentration, and NaOH concentration were selected as numerical factors, and ionic liquid type was chosen as a categorical factor. The model equations were obtained to determine BILM process behavior. The removal efficiencies, represented by the extraction and stripping efficiencies, were calculated from the experimental data. The highest removal efficiencies were determined at higher concentration values of TBP and NaOH. All ionic liquids studied in this study had good transport selectivity for the removal of formic acid. The design study showed that BILM is an effective method for the removal of formic acid from the water.
Journal of Molecular Liquids, 2018
Separation and Purification Technology, 2019
Highlights BILM is effective method for the removal of acetic acid from its aqueous solutions. ... more Highlights BILM is effective method for the removal of acetic acid from its aqueous solutions. Hydrophobic ionic liquids as a membrane phase have good transport selectivity for acetic acid. The optimal conditions were determined as 2 mol/L TBP concentration in the membrane phase, 4 N NaOH concentration in the stripping phase.
Asia-Pacific Journal of Chemical Engineering, 2017
This paper studies reactive extraction of formic (FA), acetic (AA), propionic (PA) and butyric (B... more This paper studies reactive extraction of formic (FA), acetic (AA), propionic (PA) and butyric (BA) acids from aqueous solutions by tri-n-butyl amine/diluent, with particular focus on proper optimization and modeling of extraction equilibria. The uptake capacities of amine/diluent and diluent alone approximate the following order: oleyl alcohol > octyl acetate > diisobutyl ketone and BA > PA > AA ≈ FA. An intrinsic optimization structure has been applied to the description of optimum extraction field of relevant systems, based on analyzing the variation profiles of separation ratio R and synergistic enhancement SE factors through the derivative variation method. We present new solvation molecular models extended-linear solvation energy relation (e-LSER), SPR1 and SPR2 (solvation probability relation), and an extension to group-contribution approach A-UNIFAC (Association-UNIFAC). A-UNIFAC predicts phase equilibria using new group interaction parameters regressed from vapor-liquid equilibrium data. The e-LSER model involves eight descriptors used for expressing solvent effects. By performing SPR1 and SPR2, we are able to scale up the probability range and activation energy of solvation effect. The strength of acid-amine association is calculated with chemodel. e-LSER, A-UNIFAC, SPR and chemodel simulate accurately the observed performance with average deviations inferior to 4.8%, 24.1%, 0.8% and 16.2%, respectively.
Journal of Dispersion Science and Technology, 2016
Pamukkale University Journal of Engineering Sciences, Nov 29, 2011
The liquid-liquid equilibria of Water-Propionic Acid-Benzyl Alcohol, Water-Propionic Acid-Benzyl ... more The liquid-liquid equilibria of Water-Propionic Acid-Benzyl Alcohol, Water-Propionic Acid-Benzyl Acetate andWater-Propionic Acid-Dibenzyl Ether ternary systems were predicted by means of UNIFAC Model. For thispurpose, multivariable Newton-Raphson convergence procedure was used. Experimental and model results werecompared.
Journal of Chemical & Engineering Data, 2004
Liquid-liquid equilibrium data of water + acetic acid + propionic acid + solvent (amyl a lcohol, ... more Liquid-liquid equilibrium data of water + acetic acid + propionic acid + solvent (amyl a lcohol, cyclohexyl acetate, and toluene) quaternary systems were determined. Solubility curves and tie lines were m easured at 298.15 K. A comparison of the extracting capabililies of the solvents was made with respecl to distribution coefficients, separation factors, and solvent-free selectivity bases. The reliability of t he data was ascertained from Othmer-Tobias plots. We conclude that all solvents are suitable sepa rating agenls for dilute aqueous acetic and propionic acid mixtures.
Journal of Chemical & Engineering Data, 2012
Liquid−liquid equilibrium data of water + formic acid + acetic acid + solvent (amyl acetate, diis... more Liquid−liquid equilibrium data of water + formic acid + acetic acid + solvent (amyl acetate, diisobutyl ketone, and diisopropyl ether) quaternary systems were measured at 298.15 K and atmospheric pressure. Complete phase diagrams were obtained by determining solubility curves and tie-lines. A comparison of the extracting capabilities of the solvents was made with respect to distribution coefficients, separation factors, and solvent-free selectivity bases. Reliability of the data was ascertained from Othmer−Tobias plots. The tie-lines were also predicted using the UNIFAC model. It is concluded that the used solvents can be treated as suitable separating agents for dilute aqueous formic and acetic acid mixtures.
Fluid Phase Equilibria, 2011
... Permissions & Reprints. Phase equilibria of (watercarboxylic aciddiethy... more ... Permissions & Reprints. Phase equilibria of (watercarboxylic aciddiethyl maleate) ternary liquid systems at 298.15 K. Süheyla Çehreli a , Corresponding Author Contact Information , E-mail The Corresponding Author and Tugba Gündogdu b. ...
Fluid Phase Equilibria, 2012
Liquid-liquid equilibrium (LLE) data for the ternary systems of (water-formic acid-1-undecanol), ... more Liquid-liquid equilibrium (LLE) data for the ternary systems of (water-formic acid-1-undecanol), (water-acetic acid-1-undecanol), (water-propionic acid-1-undecanol), (water-butyric acid-1undecanol), and (water-valeric acid-1-undecanol) were investigated at 298.15 K and atmospheric pressure. Complete phase diagrams were obtained by determining solubility and tie-line data. The tie-line data were compared with the results predicted by the UNIFAC, modified UNIFAC (Dortmund), and modified UNIFAC (Lyngby) methods and correlated by means of UNIQUAC model. The reliability of the experimental tie-line data was confirmed by using the Othmer-Tobias correlation. Distribution coefficients and separation factor values were evaluated for the immiscibility region.
Fluid Phase Equilibria, 2011
Liquid-liquid equilibrium data of water-acid mixture (formic-propionic acid or acetic-propionic a... more Liquid-liquid equilibrium data of water-acid mixture (formic-propionic acid or acetic-propionic acid)-solvent (amyl acetate, diisobutyl ketone, and diisopropyl ether) quaternary systems were measured at 298.15 K. Complete phase diagrams were obtained by determining solubility curves and tie-lines. A comparison of the extracting capabilities of the solvents was made with respect to distribution coefficients, separation factors and solvent-free selectivity bases. Reliability of the data was ascertained from Othmer-Tobias plots. It is concluded that the used solvents can be treated as suitable separating agents for dilute aqueous formic-propionic acid or acetic-propionic acid mixtures.
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Papers by Süheyla Çehreli