Vapor-liquid phase equilibrium of ethyl acetate-acetonitrile-ionic liquid ternary mixture
In order to effectively separate the ethyl acetate-acetonitrile azeotropic mixture,the azeotropic system containing ionic liquid was studied.The isobaric vapor-liquid equilibrium data of ethyl acetate-acetonitrile-[N1.1.1.1][NTF2](tetramethylammonium bis[(trifluoromethyl)sulfonyl]imide salt)orethylacetate-acetonitrile-[N2.2.2.2][NTF2](tetraethylammonium bis[(trifluoromethyl)sulfonyl]imide salt)ternary systems were measured at 101.3 kPa,and the effects of two ionic liquids on the vapor-liquid equilibrium of ethyl acetate-acetonitrile were discussed.The experimental results show that the addition of ionic liquids makes the system produce a significant salting-out effect.The relative volatility of the ethyl acetate-acetonitrile system increases with the increase of the mole fraction of the ionic liquid in the system.When the ionic liquid mole fraction reaches to a certain concentration,the azeotropic phenomenon disappears.The experimental data were correlated with the NRTL model to obtain the binary interaction parameters and the minimum mole fraction of the two ionic liquids required to break the azeotrope were 0.019 and 0.035,respectively.Aspen Plus software was used to industrially simulate the process flow and optimize the process parameters.Gaussian software was used to calculate the intermolecular interaction energy of each component of the ternary component for mechanism analysis.
ethyl acetateacetonitrileionic liquidNRTLAspen PlusGaussian softwareinteraction energy
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