نوع مقاله : مقاله علمی پژوهشی
1 گروه شیمی، دانشکده علوم پایه، دانشگاه گیلان، رشت، ایران
2 آزمایشگاه علمی شیمی، شرکت کیمیا طیف خزر
عنوان مقاله [English]
In this research, phase equilibria of the ternary system (water + butyric acid + methylcyclohexanol) was investigated and experimental data of liquid-liquid equilibrium were obtained at 293.2 K and ambient pressure. Solubility curve was achieved using cloud point method and Type 1 behavior was observed for liquid-liquid ternary mixture. Tie-lines were measured via acid-base and Karl-Fischer titrations. The Othmer -Tobias and Hand equations verified that the experimental tie-line points are reliable. Regression coefficients in both the equations were 0.991. Distribution coefficients and separation factors were determined over the biphasic region. The maximum and minimum values obtained for these two parameters were 5.23 and 3.84 for distribution coefficient and 48.0 and 32.7 for separation factor, respectively. The calculated values for the parameters showed that methylcyclohexanol is a proper solvent for separation of butyric acid from water. The NRTL thermodynamic model was used for correlation of experimental tie-lines. The quality of modeling was investigated using the calculation of rmsd and Gibbs free energy of mixture. The calculated value for rmsd (0.57 %) showed that modeling was done well.