İsmail İnci

Linear Solvation Energy Relationship Modeling and Kinetic Studies on Reactive Extraction of Succinic Acid by Tridodecylamine Dissolved in MIBK

Equilibrium and kinetic studies for the extraction of succinic acid from aqueous solution with tridodecylamine diluted in MIBK are reported. All measurements were carried out at 298.15 K. The extent to which the organic phase may be loaded with succinic acid is expressed as a loading ratio, Z. The equilibrium data were also interpreted by a proposed mechanism of three reactions of complexation by which (1:1) and (2:1) acid‐amine complexes are formed. Kinetics of extraction of succinic acid by tridodecylamine in MIBK has also been determined. Kinetic studies for the extraction of succinic acid from aqueous solution with tridodecylamine diluted in MIBK were carried out using a stirred cell for kinetic studies. The results of the liquid‐liquid equilibrium measurements were correlated by a linear solvation energy relationship (LSER) model, which takes into account physical interactions. From the regression coefficients, information on the solvent‐solute interaction is obtained and solvation models are proposed.

Performance Study of Pervaporation Reactor (PVR) for Esterification of Acetic Acid with Ethanol

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.

Oxalic acid removal from wastewater using multi-walled carbon nanotubes: Kinetic and equilibrium analysis

ABSTRACT Oxalic acid adsorption from aqueous solution is studied in this work. Multi-walled carbon nanotubes (MWCNT) were used as an adsorbent. The investigated adsorption variables are equilibrium time, initial acid concentration, and temperature. The experimental results were presented using equilibrium isotherm and kinetic models. The used equilibrium models are Langmuir, Freundlich, and Temkin adsorption isotherms. And the kinetic models are Elovich, Lagergren pseudo-first-order and pseudo-second-order kinetic models. The thermodynamics studies were carried out at three different temperatures: 278, 298, and 318 K. Langmuir isotherm was the best fitted equilibrium model for the experimental data. The all applied kinetic models fitted the data suitably. GRAPHICAL ABSTRACT