A cyclohexane-ethanol mixture is a common azeotropic system in the production of chemical production.Solvent extraction is an important way to separate cyclohexane-ethanol mixtures.Under the experimental conditions of atmospheric pressure and 30 ℃,three kinds of ionic liquids,namely[EMIM][OTF](1-ethyl-3-methylimidazole trifluoromethane sulfonate),[EMIM][SCN](1-ethyl-3-methylimidazole thiocyanate)and[EMIM][DCA](1-ethyl-3-methylimidazolium dicyandiamide)were used as extractants to obtain the liquid-liquid equilibrium data for the system of cyclohexane-ethanol.The extraction performance of different ionic liquids was evaluated by the distribution coefficient and selectivity.Besides,the consistency and reliability of the phase equilibrium experimental data were verified according to the Othmer-Tobias and Hand equations.Finally,Aspen Plus software was used to select the NRTL model to correlate the phase equilibrium data and obtained the binary interaction parameters,which were used to calculate the corresponding phase equilibrium composition.The root mean square deviation between the calculated value and the experimental value is less than 0.02 through the above research,indicating that the NRTL model can describe the ternary phase equilibrium process accurately.
关键词
环己烷-乙醇/离子液体/相平衡/溶剂萃取/分配系数/NRTL模型
Key words
cyclohexane-ethanol/ionic liquid/phase equilibrium/solvent extraction/distribution coefficient/NRTL model
维普
万方数据