The Study Of Isobaric Vapor-Liquid Equilibria Of Some Azeotropic Systems Extractive Distillation With Ionic Liquids

It was researched in this paper that the solutions of methyl acetate-water and isopropanol-water were separated with the extractive distillation, in which including the vapour-liquid equilibria test, the effect of the ionic liquid to the relative volatility of methyl acetate to water and isopropanol to water, and furthermore correlating the result with model based for the chemical engineering design.Using NRTL model, it was made the prediction of the feasibility of3-ethyl-1-methylimidazolium tetrafluoroborate as extractive solvent to separate the solutions:methyl acetate-water, isopropanol-water. Based on this, the isobaric vapor-liquid equilibrium data for the isopropanol-water-1-ethyl-3-methylimidazolium tetrafluoroborate, methylacetate-water-1-ethyl-3-methyl-imidazolium tetrafluoroborate at atmospheric pressure. It was showed that the chosen ionic liquid could improve the relative volatility of isopropanol and the the salting-out effect could increased with the adding of the ionic liquid.The model parameters were obtained through treating with the duality system isopropanol-water with the models of NRTL; the correlating of the vapor-liquid equilibrium was made with the model of NRTL, and the correlated results showed that the models could be used to direct the process design.The correlating and experiment results showed that the chosen1-ethyl-3-methylimidazolium tetrafluoroborate had good effect to separate isopropanol and water and this ionic liquid was a more propising extractive solvent to separate isopropanol and water. And because of its nonvolatility, the IL can be regenerated by different methods such as stripping, revolving evaporating, and drying.